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From:   ChiaEn Wu <peterwu.pub@gmail.com>
To:     jic23@kernel.org, lars@metafoo.de, matthias.bgg@gmail.com,
        lee.jones@linaro.org, daniel.thompson@linaro.org,
        jingoohan1@gmail.com, pavel@ucw.cz, robh+dt@kernel.org,
        krzysztof.kozlowski+dt@linaro.org
Cc:     linux-iio@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-mediatek@lists.infradead.org, linux-kernel@vger.kernel.org,
        dri-devel@lists.freedesktop.org, linux-leds@vger.kernel.org,
        devicetree@vger.kernel.org, linux-pm@vger.kernel.org,
        linux-usb@vger.kernel.org, linux-fbdev@vger.kernel.org,
        szunichen@gmail.com, ChiaEn Wu <chiaen_wu@richtek.com>
Subject: [PATCH v2 12/15] power: supply: mt6370: Add Mediatek MT6370 charger driver
Date:   Mon, 13 Jun 2022 19:11:43 +0800
Message-Id: <20220613111146.25221-13-peterwu.pub@gmail.com>
In-Reply-To: <20220613111146.25221-1-peterwu.pub@gmail.com>
References: <20220613111146.25221-1-peterwu.pub@gmail.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

From: ChiaEn Wu <chiaen_wu@richtek.com>

Add Mediatek MT6370 charger driver.

Signed-off-by: ChiaEn Wu <chiaen_wu@richtek.com>
---
 drivers/power/supply/Kconfig          |   11 +
 drivers/power/supply/Makefile         |    1 +
 drivers/power/supply/mt6370-charger.c | 1132 +++++++++++++++++++++++++
 3 files changed, 1144 insertions(+)
 create mode 100644 drivers/power/supply/mt6370-charger.c

diff --git a/drivers/power/supply/Kconfig b/drivers/power/supply/Kconfig
index 1aa8323ad9f6..54d8c3ab01cc 100644
--- a/drivers/power/supply/Kconfig
+++ b/drivers/power/supply/Kconfig
@@ -619,6 +619,17 @@ config CHARGER_MT6360
 	  Average Input Current Regulation, Battery Temperature Sensing,
 	  Over-Temperature Protection, DPDM Detection for BC1.2.
 
+config CHARGER_MT6370
+	tristate "Mediatek MT6370 Charger Driver"
+	depends on MFD_MT6370
+	depends on REGULATOR
+	select LINEAR_RANGES
+	help
+	  Say Y here to enable MT6370 Charger Part.
+	  The device supports High-Accuracy Voltage/Current Regulation,
+	  Average Input Current Regulation, Battery Temperature Sensing,
+	  Over-Temperature Protection, DPDM Detection for BC1.2.
+
 config CHARGER_QCOM_SMBB
 	tristate "Qualcomm Switch-Mode Battery Charger and Boost"
 	depends on MFD_SPMI_PMIC || COMPILE_TEST
diff --git a/drivers/power/supply/Makefile b/drivers/power/supply/Makefile
index 7f02f36aea55..8c9527643c86 100644
--- a/drivers/power/supply/Makefile
+++ b/drivers/power/supply/Makefile
@@ -82,6 +82,7 @@ obj-$(CONFIG_CHARGER_MAX8997)	+= max8997_charger.o
 obj-$(CONFIG_CHARGER_MAX8998)	+= max8998_charger.o
 obj-$(CONFIG_CHARGER_MP2629)	+= mp2629_charger.o
 obj-$(CONFIG_CHARGER_MT6360)	+= mt6360_charger.o
+obj-$(CONFIG_CHARGER_MT6370)	+= mt6370-charger.o
 obj-$(CONFIG_CHARGER_QCOM_SMBB)	+= qcom_smbb.o
 obj-$(CONFIG_CHARGER_BQ2415X)	+= bq2415x_charger.o
 obj-$(CONFIG_CHARGER_BQ24190)	+= bq24190_charger.o
diff --git a/drivers/power/supply/mt6370-charger.c b/drivers/power/supply/mt6370-charger.c
new file mode 100644
index 000000000000..539da62df2db
--- /dev/null
+++ b/drivers/power/supply/mt6370-charger.c
@@ -0,0 +1,1132 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <dt-bindings/iio/adc/mediatek,mt6370_adc.h>
+#include <linux/atomic.h>
+#include <linux/bitfield.h>
+#include <linux/bits.h>
+#include <linux/gpio/consumer.h>
+#include <linux/iio/consumer.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/power_supply.h>
+#include <linux/regmap.h>
+#include <linux/regulator/driver.h>
+#include <linux/workqueue.h>
+
+#define MT6370_REG_CHG_CTRL1		0x111
+#define MT6370_REG_CHG_CTRL2		0x112
+#define MT6370_REG_CHG_CTRL3		0x113
+#define MT6370_REG_CHG_CTRL4		0x114
+#define MT6370_REG_CHG_CTRL5		0x115
+#define MT6370_REG_CHG_CTRL6		0x116
+#define MT6370_REG_CHG_CTRL7		0x117
+#define MT6370_REG_CHG_CTRL8		0x118
+#define MT6370_REG_CHG_CTRL9		0x119
+#define MT6370_REG_CHG_CTRL10		0x11A
+#define MT6370_REG_DEVICE_TYPE		0x122
+#define MT6370_REG_USB_STATUS1		0x127
+#define MT6370_REG_CHG_STAT		0x14A
+#define MT6370_REG_FLED_EN		0x17E
+#define MT6370_REG_CHG_STAT1		0X1D0
+#define MT6370_REG_OVPCTRL_STAT		0x1D8
+
+#define MT6370_VOBST_MASK		GENMASK(7, 2)
+#define MT6370_OTG_PIN_EN_MASK		BIT(1)
+#define MT6370_OPA_MODE_MASK		BIT(0)
+#define MT6370_OTG_OC_MASK		GENMASK(2, 0)
+
+#define MT6370_MIVR_IBUS_TH		100000		/* 100 mA */
+
+enum mt6370_chg_reg_field {
+	/* MT6370_REG_CHG_CTRL2 */
+	F_IINLMTSEL, F_CFO_EN, F_CHG_EN,
+	/* MT6370_REG_CHG_CTRL3 */
+	F_IAICR, F_AICR_EN, F_ILIM_EN,
+	/* MT6370_REG_CHG_CTRL4 */
+	F_VOREG,
+	/* MT6370_REG_CHG_CTRL5 */
+	F_VOBST,
+	/* MT6370_REG_CHG_CTRL6 */
+	F_VMIVR,
+	/* MT6370_REG_CHG_CTRL7 */
+	F_ICHG,
+	/* MT6370_REG_CHG_CTRL8 */
+	F_IPREC,
+	/* MT6370_REG_CHG_CTRL9 */
+	F_IEOC,
+	/* MT6370_REG_DEVICE_TYPE */
+	F_USBCHGEN,
+	/* MT6370_REG_USB_STATUS1 */
+	F_USB_STAT, F_CHGDET,
+	/* MT6370_REG_CHG_STAT */
+	F_CHG_STAT, F_BOOST_STAT, F_VBAT_LVL,
+	/* MT6370_REG_FLED_EN */
+	F_FL_STROBE,
+	/* MT6370_REG_CHG_STAT1 */
+	F_CHG_MIVR_STAT,
+	/* MT6370_REG_OVPCTRL_STAT */
+	F_UVP_D_STAT,
+	F_MAX,
+};
+
+struct mt6370_priv {
+	struct device *dev;
+	struct iio_channel *iio_adcs;
+	struct mutex attach_lock;
+	struct power_supply *psy;
+	struct power_supply_desc *psy_desc;
+	struct regmap *regmap;
+	struct regmap_field *rmap_fields[F_MAX];
+	struct regulator_dev *rdev;
+	struct workqueue_struct *wq;
+	struct work_struct bc12_work;
+	struct delayed_work mivr_dwork;
+	atomic_t attach;
+	int psy_usb_type;
+	bool pwr_rdy;
+};
+
+enum mt6370_usb_status {
+	MT6370_USB_STAT_NO_VBUS = 0,
+	MT6370_USB_STAT_VBUS_FLOW_IS_UNDER_GOING,
+	MT6370_USB_STAT_SDP,
+	MT6370_USB_STAT_SDP_NSTD,
+	MT6370_USB_STAT_DCP,
+	MT6370_USB_STAT_CDP,
+	MT6370_USB_STAT_MAX,
+};
+
+struct mt6370_chg_range {
+	u32 min;
+	u32 max;
+	u16 step;
+	u8 offset;
+	const u32 *table;
+	u16 num_table;
+	bool round_up;
+};
+
+struct mt6370_chg_field {
+	const char *name;
+	const struct mt6370_chg_range *range;
+	struct reg_field field;
+};
+
+static const u32 mt6370_chg_otg_oc_ma[] = {
+	500000, 700000, 1100000, 1300000, 1800000, 2100000, 2400000,
+};
+
+#define MT6370_CHG_RANGE(_min, _max, _step, _offset, _ru)		\
+{									\
+	.min = _min,							\
+	.max = _max,							\
+	.step = _step,							\
+	.offset = _offset,						\
+	.round_up = _ru,						\
+}
+
+#define MT6370_CHG_RANGE_T(_table, _ru)					\
+{									\
+	.table = _table,						\
+	.num_table = ARRAY_SIZE(_table),				\
+	.round_up = _ru,						\
+}
+
+static const struct mt6370_chg_range mt6370_chg_ranges[F_MAX] = {
+	[F_IAICR] = MT6370_CHG_RANGE(100, 3250, 50, 0, false),
+	[F_VOREG] = MT6370_CHG_RANGE(3900, 4710, 10, 0, false),
+	[F_VOBST] = MT6370_CHG_RANGE(4425, 5825, 25, 0, false),
+	[F_VMIVR] = MT6370_CHG_RANGE(3900, 13400, 100, 0, true),
+	[F_ICHG] = MT6370_CHG_RANGE(900, 5000, 100, 8, false),
+	[F_IPREC] = MT6370_CHG_RANGE(100, 850, 50, 0, false),
+	[F_IEOC] = MT6370_CHG_RANGE(100, 850, 50, 0, false),
+};
+
+#define MT6370_CHG_FIELD_RANGE(_fd, _reg, _lsb, _msb, _range)		\
+[_fd] = {								\
+	.name = #_fd,							\
+	.range = _range ? &mt6370_chg_ranges[_fd] : NULL,		\
+	.field = REG_FIELD(_reg, _lsb, _msb),				\
+}
+
+#define MT6370_CHG_FIELD(_fd, _reg, _lsb, _msb)				\
+	MT6370_CHG_FIELD_RANGE(_fd, _reg, _lsb, _msb, (_msb > _lsb))
+
+static const struct mt6370_chg_field mt6370_chg_fields[F_MAX] = {
+	MT6370_CHG_FIELD_RANGE(F_IINLMTSEL, MT6370_REG_CHG_CTRL2, 2, 3, false),
+	MT6370_CHG_FIELD(F_CFO_EN, MT6370_REG_CHG_CTRL2, 1, 1),
+	MT6370_CHG_FIELD(F_CHG_EN, MT6370_REG_CHG_CTRL2, 0, 0),
+	MT6370_CHG_FIELD(F_IAICR, MT6370_REG_CHG_CTRL3, 2, 7),
+	MT6370_CHG_FIELD(F_AICR_EN, MT6370_REG_CHG_CTRL3, 1, 1),
+	MT6370_CHG_FIELD(F_ILIM_EN, MT6370_REG_CHG_CTRL3, 0, 0),
+	MT6370_CHG_FIELD(F_VOREG, MT6370_REG_CHG_CTRL4, 1, 7),
+	MT6370_CHG_FIELD(F_VOBST, MT6370_REG_CHG_CTRL5, 2, 7),
+	MT6370_CHG_FIELD(F_VMIVR, MT6370_REG_CHG_CTRL6, 1, 7),
+	MT6370_CHG_FIELD(F_ICHG, MT6370_REG_CHG_CTRL7, 2, 7),
+	MT6370_CHG_FIELD(F_IPREC, MT6370_REG_CHG_CTRL8, 0, 3),
+	MT6370_CHG_FIELD(F_IEOC, MT6370_REG_CHG_CTRL9, 4, 7),
+	MT6370_CHG_FIELD(F_USBCHGEN, MT6370_REG_DEVICE_TYPE, 7, 7),
+	MT6370_CHG_FIELD_RANGE(F_USB_STAT, MT6370_REG_USB_STATUS1, 4, 6, false),
+	MT6370_CHG_FIELD(F_CHGDET, MT6370_REG_USB_STATUS1, 3, 3),
+	MT6370_CHG_FIELD_RANGE(F_CHG_STAT, MT6370_REG_CHG_STAT, 6, 7, false),
+	MT6370_CHG_FIELD(F_BOOST_STAT, MT6370_REG_CHG_STAT, 3, 3),
+	MT6370_CHG_FIELD(F_VBAT_LVL, MT6370_REG_CHG_STAT, 5, 5),
+	MT6370_CHG_FIELD(F_FL_STROBE, MT6370_REG_FLED_EN, 2, 2),
+	MT6370_CHG_FIELD(F_CHG_MIVR_STAT, MT6370_REG_CHG_STAT1, 6, 6),
+	MT6370_CHG_FIELD(F_UVP_D_STAT, MT6370_REG_OVPCTRL_STAT, 4, 4),
+};
+
+static inline u32 mt6370_chg_val_to_reg(const struct mt6370_chg_range *range,
+					u32 val)
+{
+	int i;
+	u8 reg;
+
+	if (!range)
+		return val;
+
+	if (range->table) {
+		if (val <= range->table[0])
+			return 0;
+
+		for (i = 1; i < range->num_table - 1; i++) {
+			if (val == range->table[i])
+				return i;
+			if (val > range->table[i] &&
+			    val < range->table[i + 1])
+				return range->round_up ? i + 1 : i;
+		}
+
+		return range->num_table - 1;
+	}
+
+	if (val <= range->min)
+		reg = 0;
+	else if (val >= range->max)
+		reg = (range->max - range->min) / range->step;
+	else if (range->round_up)
+		reg = DIV_ROUND_UP(val - range->min, range->step);
+	else
+		reg = (val - range->min) / range->step;
+
+	return reg + range->offset;
+}
+
+static inline u32 mt6370_chg_reg_to_val(const struct mt6370_chg_range *range,
+					u8 reg)
+{
+	if (!range)
+		return reg;
+
+	return range->table ? range->table[reg] :
+			      range->min + range->step * (reg - range->offset);
+}
+
+static inline int mt6370_chg_field_get(struct mt6370_priv *priv,
+				       enum mt6370_chg_reg_field fd, u32 *val)
+{
+	int ret;
+	u32 reg_val;
+
+	ret = regmap_field_read(priv->rmap_fields[fd], &reg_val);
+	if (ret < 0)
+		return ret;
+
+	*val = mt6370_chg_reg_to_val(mt6370_chg_fields[fd].range, reg_val);
+
+	return 0;
+}
+
+static inline int mt6370_chg_field_set(struct mt6370_priv *priv,
+				       enum mt6370_chg_reg_field fd, u32 val)
+{
+	val = mt6370_chg_val_to_reg(mt6370_chg_fields[fd].range, val);
+
+	return regmap_field_write(priv->rmap_fields[fd], val);
+}
+
+enum {
+	MT6370_CHG_STAT_READY = 0,
+	MT6370_CHG_STAT_CHARGE_IN_PROGRESS,
+	MT6370_CHG_STAT_DONE,
+	MT6370_CHG_STAT_FAULT,
+	MT6370_CHG_STAT_MAX,
+};
+
+enum {
+	MT6370_ATTACH_STAT_DETACH = 0,
+	MT6370_ATTACH_STAT_ATTACH_BC12_NOT_DONE,
+	MT6370_ATTACH_STAT_ATTACH_BC12_DONE,
+	MT6370_ATTACH_STAT_ATTACH_MAX,
+};
+
+static int mt6370_chg_otg_of_parse_cb(struct device_node *of,
+				      const struct regulator_desc *rdesc,
+				      struct regulator_config *rcfg)
+{
+	struct mt6370_priv *priv = rcfg->driver_data;
+	unsigned int val;
+	int ret = 0;
+
+	rcfg->ena_gpiod = fwnode_gpiod_get_index(of_fwnode_handle(of),
+						 "enable", 0,
+						 GPIOD_OUT_LOW |
+						 GPIOD_FLAGS_BIT_NONEXCLUSIVE,
+						 rdesc->name);
+	if (IS_ERR(rcfg->ena_gpiod)) {
+		dev_err(priv->dev, "Failed to requeset OTG EN Pin\n");
+		rcfg->ena_gpiod = NULL;
+	} else {
+		val = MT6370_OPA_MODE_MASK | MT6370_OTG_PIN_EN_MASK;
+		ret = regmap_update_bits(priv->regmap, MT6370_REG_CHG_CTRL1,
+					 val, val);
+		if (ret)
+			dev_err(priv->dev, "Failed to set otg bits\n");
+	}
+
+	return ret;
+}
+
+static void mt6370_chg_bc12_work_func(struct work_struct *work)
+{
+	struct mt6370_priv *priv = container_of(work, struct mt6370_priv,
+						bc12_work);
+	int ret, attach;
+	bool rpt_psy = false;
+	u32 usb_stat;
+
+	mutex_lock(&priv->attach_lock);
+	attach = atomic_read(&priv->attach);
+
+	switch (attach) {
+	case MT6370_ATTACH_STAT_DETACH:
+		usb_stat = 0;
+		break;
+	case MT6370_ATTACH_STAT_ATTACH_BC12_DONE:
+		ret = mt6370_chg_field_get(priv, F_USB_STAT, &usb_stat);
+		if (ret < 0) {
+			dev_err(priv->dev, "Failed to get USB status\n");
+			goto bc12_work_func_out;
+		}
+		break;
+	case MT6370_ATTACH_STAT_ATTACH_BC12_NOT_DONE:
+		ret = mt6370_chg_field_set(priv, F_USBCHGEN, attach);
+		if (ret < 0)
+			dev_err(priv->dev, "Failed to enable USB CHG EN\n");
+		goto bc12_work_func_out;
+	default:
+		dev_err(priv->dev, "Invalid attach state\n");
+		goto bc12_work_func_out;
+	}
+
+	rpt_psy = true;
+
+	switch (usb_stat) {
+	case MT6370_USB_STAT_SDP:
+		priv->psy_desc->type = POWER_SUPPLY_TYPE_USB;
+		priv->psy_usb_type = POWER_SUPPLY_USB_TYPE_SDP;
+		break;
+	case MT6370_USB_STAT_SDP_NSTD:
+		priv->psy_desc->type = POWER_SUPPLY_TYPE_USB;
+		priv->psy_usb_type = POWER_SUPPLY_USB_TYPE_DCP;
+		break;
+	case MT6370_USB_STAT_DCP:
+		priv->psy_desc->type = POWER_SUPPLY_TYPE_USB_DCP;
+		priv->psy_usb_type = POWER_SUPPLY_USB_TYPE_DCP;
+		break;
+	case MT6370_USB_STAT_CDP:
+		priv->psy_desc->type = POWER_SUPPLY_TYPE_USB_CDP;
+		priv->psy_usb_type = POWER_SUPPLY_USB_TYPE_CDP;
+		break;
+	case MT6370_USB_STAT_NO_VBUS:
+	case MT6370_USB_STAT_VBUS_FLOW_IS_UNDER_GOING:
+	default:
+		priv->psy_desc->type = POWER_SUPPLY_TYPE_USB;
+		priv->psy_usb_type = POWER_SUPPLY_USB_TYPE_UNKNOWN;
+		break;
+	}
+
+bc12_work_func_out:
+	mutex_unlock(&priv->attach_lock);
+
+	if (rpt_psy)
+		power_supply_changed(priv->psy);
+}
+
+static inline void mt6370_chg_enable_irq(struct mt6370_priv *priv,
+					 const char *irq_name, bool en)
+{
+	int irq_num;
+	struct platform_device *pdev = to_platform_device(priv->dev);
+
+	irq_num = platform_get_irq_byname(pdev, irq_name);
+
+	if (irq_num < 0) {
+		dev_err(priv->dev, "Failed to get platform resource\n");
+	} else {
+		if (en)
+			enable_irq(irq_num);
+		else
+			disable_irq_nosync(irq_num);
+	}
+}
+
+static int mt6370_chg_toggle_cfo(struct mt6370_priv *priv)
+{
+	int ret;
+	u32 fl_strobe;
+
+	/* check if flash led in strobe mode */
+	ret = mt6370_chg_field_get(priv, F_FL_STROBE, &fl_strobe);
+	if (ret < 0) {
+		dev_err(priv->dev, "Failed to get FL_STROBE_EN\n");
+		goto toggle_cfo_exit;
+	}
+
+	if (fl_strobe) {
+		dev_err(priv->dev, "Flash led is still in strobe mode\n");
+		goto toggle_cfo_exit;
+	}
+
+	/* cfo off */
+	ret = mt6370_chg_field_set(priv, F_CFO_EN, 0);
+	if (ret < 0) {
+		dev_err(priv->dev, "Failed to disable CFO_EN\n");
+		goto toggle_cfo_exit;
+	}
+
+	/* cfo on */
+	ret = mt6370_chg_field_set(priv, F_CFO_EN, 1);
+	if (ret < 0) {
+		dev_err(priv->dev, "Failed to enable CFO_EN\n");
+		goto toggle_cfo_exit;
+	}
+
+toggle_cfo_exit:
+	return ret;
+}
+
+static int mt6370_chg_read_adc_chan(struct mt6370_priv *priv, unsigned int chan,
+				    int *val)
+{
+	int ret;
+
+	if (chan >= MT6370_CHAN_MAX)
+		return -EINVAL;
+
+	ret = iio_read_channel_processed(&priv->iio_adcs[chan], val);
+	if (ret)
+		dev_err(priv->dev, "Failed to read adc\n");
+
+	return ret;
+}
+
+static void mt6370_chg_mivr_dwork_func(struct work_struct *work)
+{
+	struct mt6370_priv *priv = container_of(work, struct mt6370_priv,
+						mivr_dwork.work);
+	int ret;
+	u32 mivr_stat;
+	unsigned int ibus;
+
+	ret = mt6370_chg_field_get(priv, F_CHG_MIVR_STAT, &mivr_stat);
+	if (ret < 0) {
+		dev_err(priv->dev, "Failed to get mivr state\n");
+		goto mivr_handler_out;
+	}
+
+	if (!mivr_stat)
+		goto mivr_handler_out;
+
+	ret = mt6370_chg_read_adc_chan(priv, MT6370_CHAN_IBUS, &ibus);
+	if (ret) {
+		dev_err(priv->dev, "Failed to get ibus\n");
+		goto mivr_handler_out;
+	}
+
+	if (ibus < MT6370_MIVR_IBUS_TH) {
+		ret = mt6370_chg_toggle_cfo(priv);
+		if (ret)
+			dev_err(priv->dev, "Failed to toggle cfo\n");
+	}
+
+mivr_handler_out:
+	mt6370_chg_enable_irq(priv, "mivr", true);
+	pm_relax(priv->dev);
+}
+
+static void mt6370_chg_pwr_rdy_check(struct mt6370_priv *priv)
+{
+	int ret;
+	u32 pwr_rdy, otg_en;
+	union power_supply_propval val;
+
+	/* Check in otg mode or not */
+	ret = mt6370_chg_field_get(priv, F_BOOST_STAT, &otg_en);
+	if (ret < 0) {
+		dev_err(priv->dev, "Failed to get otg state\n");
+		return;
+	}
+
+	if (otg_en)
+		return;
+
+	ret = mt6370_chg_field_get(priv, F_UVP_D_STAT, &pwr_rdy);
+	if (ret < 0) {
+		dev_err(priv->dev, "Failed to get pwr_rdy state reg\n");
+		return;
+	}
+
+	val.intval = !pwr_rdy;
+
+	ret = power_supply_set_property(priv->psy, POWER_SUPPLY_PROP_ONLINE,
+					&val);
+	if (ret)
+		dev_err(priv->dev, "Failed to start attach/detach flow\n");
+}
+
+static int mt6370_chg_get_online(struct mt6370_priv *priv,
+				 union power_supply_propval *val)
+{
+	mutex_lock(&priv->attach_lock);
+	val->intval = !!atomic_read(&priv->attach);
+	mutex_unlock(&priv->attach_lock);
+
+	return 0;
+}
+
+static int mt6370_chg_get_status(struct mt6370_priv *priv,
+				 union power_supply_propval *val)
+{
+	int ret;
+	u32 chg_stat;
+
+	ret = mt6370_chg_get_online(priv, val);
+	if (!val->intval) {
+		val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
+		return 0;
+	}
+
+	ret = mt6370_chg_field_get(priv, F_CHG_STAT, &chg_stat);
+	if (ret < 0)
+		return ret;
+
+	switch (chg_stat) {
+	case MT6370_CHG_STAT_READY:
+	case MT6370_CHG_STAT_FAULT:
+		val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
+		break;
+	case MT6370_CHG_STAT_CHARGE_IN_PROGRESS:
+		val->intval = POWER_SUPPLY_STATUS_CHARGING;
+		break;
+	case MT6370_CHG_STAT_DONE:
+		val->intval = POWER_SUPPLY_STATUS_FULL;
+		break;
+	default:
+		val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
+		break;
+	}
+
+	return ret;
+}
+
+static int mt6370_chg_get_charge_type(struct mt6370_priv *priv,
+				      union power_supply_propval *val)
+{
+	int type, ret;
+	u32 chg_stat, vbat_lvl;
+
+	ret = mt6370_chg_field_get(priv, F_CHG_STAT, &chg_stat);
+	if (ret < 0)
+		return ret;
+
+	ret = mt6370_chg_field_get(priv, F_VBAT_LVL, &vbat_lvl);
+	if (ret < 0)
+		return ret;
+
+	switch (chg_stat) {
+	case MT6370_CHG_STAT_CHARGE_IN_PROGRESS:
+		if (vbat_lvl)
+			type = POWER_SUPPLY_CHARGE_TYPE_FAST;
+		else
+			type = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
+		break;
+	case MT6370_CHG_STAT_READY:
+	case MT6370_CHG_STAT_DONE:
+	case MT6370_CHG_STAT_FAULT:
+	default:
+		type = POWER_SUPPLY_CHARGE_TYPE_NONE;
+		break;
+	}
+
+	val->intval = type;
+
+	return 0;
+}
+
+static int mt6370_chg_get_ichg(struct mt6370_priv *priv,
+			       union power_supply_propval *val)
+{
+	return mt6370_chg_field_get(priv, F_ICHG, &val->intval);
+}
+
+static int mt6370_chg_get_max_ichg(struct mt6370_priv *priv,
+				   union power_supply_propval *val)
+{
+	return mt6370_chg_ranges[F_ICHG].max;
+}
+
+static int mt6370_chg_get_cv(struct mt6370_priv *priv,
+			     union power_supply_propval *val)
+{
+	return mt6370_chg_field_get(priv, F_VOREG, &val->intval);
+}
+
+static int mt6370_chg_get_max_cv(struct mt6370_priv *priv,
+				 union power_supply_propval *val)
+{
+	return mt6370_chg_ranges[F_VOREG].max;
+}
+
+static int mt6370_chg_get_aicr(struct mt6370_priv *priv,
+			       union power_supply_propval *val)
+{
+	return mt6370_chg_field_get(priv, F_IAICR, &val->intval);
+}
+
+static int mt6370_chg_get_mivr(struct mt6370_priv *priv,
+			       union power_supply_propval *val)
+{
+	return mt6370_chg_field_get(priv, F_VMIVR, &val->intval);
+}
+
+static int mt6370_chg_get_iprechg(struct mt6370_priv *priv,
+				  union power_supply_propval *val)
+{
+	return mt6370_chg_field_get(priv, F_IPREC, &val->intval);
+}
+
+static int mt6370_chg_get_ieoc(struct mt6370_priv *priv,
+			       union power_supply_propval *val)
+{
+	return mt6370_chg_field_get(priv, F_IEOC, &val->intval);
+}
+
+static int mt6370_chg_set_online(struct mt6370_priv *priv,
+				 const union power_supply_propval *val)
+{
+	int attach;
+	u32 pwr_rdy = !!val->intval;
+
+	mutex_lock(&priv->attach_lock);
+	attach = atomic_read(&priv->attach);
+	if (pwr_rdy == !!attach) {
+		dev_err(priv->dev, "pwr_rdy is same(%d)\n", pwr_rdy);
+		mutex_unlock(&priv->attach_lock);
+		return 0;
+	}
+
+	atomic_set(&priv->attach, pwr_rdy);
+	mutex_unlock(&priv->attach_lock);
+
+	if (!queue_work(priv->wq, &priv->bc12_work))
+		dev_err(priv->dev, "bc12 work has already queued\n");
+
+	return 0;
+
+}
+
+static int mt6370_chg_set_ichg(struct mt6370_priv *priv,
+			       const union power_supply_propval *val)
+{
+	return mt6370_chg_field_set(priv, F_ICHG, val->intval);
+}
+
+static int mt6370_chg_set_cv(struct mt6370_priv *priv,
+			     const union power_supply_propval *val)
+{
+	return mt6370_chg_field_set(priv, F_VOREG, val->intval);
+}
+
+static int mt6370_chg_set_aicr(struct mt6370_priv *priv,
+			       const union power_supply_propval *val)
+{
+	return mt6370_chg_field_set(priv, F_IAICR, val->intval);
+}
+
+static int mt6370_chg_set_mivr(struct mt6370_priv *priv,
+			       const union power_supply_propval *val)
+{
+	return mt6370_chg_field_set(priv, F_VMIVR, val->intval);
+}
+
+static int mt6370_chg_set_iprechg(struct mt6370_priv *priv,
+				  const union power_supply_propval *val)
+{
+	return mt6370_chg_field_set(priv, F_IPREC, val->intval);
+}
+
+static int mt6370_chg_set_ieoc(struct mt6370_priv *priv,
+			       const union power_supply_propval *val)
+{
+	return mt6370_chg_field_set(priv, F_IEOC, val->intval);
+}
+
+static int mt6370_chg_get_property(struct power_supply *psy,
+				   enum power_supply_property psp,
+				   union power_supply_propval *val)
+{
+	struct mt6370_priv *priv = power_supply_get_drvdata(psy);
+	int ret = 0;
+
+	switch (psp) {
+	case POWER_SUPPLY_PROP_ONLINE:
+		ret = mt6370_chg_get_online(priv, val);
+		break;
+	case POWER_SUPPLY_PROP_STATUS:
+		ret = mt6370_chg_get_status(priv, val);
+		break;
+	case POWER_SUPPLY_PROP_CHARGE_TYPE:
+		ret = mt6370_chg_get_charge_type(priv, val);
+		break;
+	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
+		ret = mt6370_chg_get_ichg(priv, val);
+		break;
+	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
+		ret = mt6370_chg_get_max_ichg(priv, val);
+		break;
+	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
+		ret = mt6370_chg_get_cv(priv, val);
+		break;
+	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
+		ret = mt6370_chg_get_max_cv(priv, val);
+		break;
+	case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
+		ret = mt6370_chg_get_aicr(priv, val);
+		break;
+	case POWER_SUPPLY_PROP_INPUT_VOLTAGE_LIMIT:
+		ret = mt6370_chg_get_mivr(priv, val);
+		break;
+	case POWER_SUPPLY_PROP_PRECHARGE_CURRENT:
+		ret = mt6370_chg_get_iprechg(priv, val);
+		break;
+	case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
+		ret = mt6370_chg_get_ieoc(priv, val);
+		break;
+	case POWER_SUPPLY_PROP_TYPE:
+		val->intval = priv->psy_desc->type;
+		break;
+	case POWER_SUPPLY_PROP_USB_TYPE:
+		val->intval = priv->psy_usb_type;
+		break;
+	default:
+		ret = -EINVAL;
+		break;
+	}
+
+	return ret;
+}
+
+static int mt6370_chg_set_property(struct power_supply *psy,
+				   enum power_supply_property psp,
+				   const union power_supply_propval *val)
+{
+	struct mt6370_priv *priv = power_supply_get_drvdata(psy);
+	int ret;
+
+	switch (psp) {
+	case POWER_SUPPLY_PROP_ONLINE:
+		ret = mt6370_chg_set_online(priv, val);
+		break;
+	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
+		ret = mt6370_chg_set_ichg(priv, val);
+		break;
+	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
+		ret = mt6370_chg_set_cv(priv, val);
+		break;
+	case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
+		ret = mt6370_chg_set_aicr(priv, val);
+		break;
+	case POWER_SUPPLY_PROP_INPUT_VOLTAGE_LIMIT:
+		ret = mt6370_chg_set_mivr(priv, val);
+		break;
+	case POWER_SUPPLY_PROP_PRECHARGE_CURRENT:
+		ret = mt6370_chg_set_iprechg(priv, val);
+		break;
+	case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
+		ret = mt6370_chg_set_ieoc(priv, val);
+		break;
+	default:
+		ret = -EINVAL;
+	}
+	return ret;
+}
+
+static int mt6370_chg_property_is_writeable(struct power_supply *psy,
+					    enum power_supply_property psp)
+{
+	switch (psp) {
+	case POWER_SUPPLY_PROP_ONLINE:
+	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
+	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
+	case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
+	case POWER_SUPPLY_PROP_INPUT_VOLTAGE_LIMIT:
+	case POWER_SUPPLY_PROP_PRECHARGE_CURRENT:
+	case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
+		return 1;
+	default:
+		return 0;
+	}
+}
+
+static enum power_supply_property mt6370_chg_properties[] = {
+	POWER_SUPPLY_PROP_ONLINE,
+	POWER_SUPPLY_PROP_STATUS,
+	POWER_SUPPLY_PROP_CHARGE_TYPE,
+	POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
+	POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX,
+	POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
+	POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX,
+	POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT,
+	POWER_SUPPLY_PROP_INPUT_VOLTAGE_LIMIT,
+	POWER_SUPPLY_PROP_PRECHARGE_CURRENT,
+	POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT,
+	POWER_SUPPLY_PROP_TYPE,
+	POWER_SUPPLY_PROP_USB_TYPE,
+};
+
+static enum power_supply_usb_type mt6370_chg_usb_types[] = {
+	POWER_SUPPLY_USB_TYPE_UNKNOWN,
+	POWER_SUPPLY_USB_TYPE_SDP,
+	POWER_SUPPLY_USB_TYPE_CDP,
+	POWER_SUPPLY_USB_TYPE_DCP,
+};
+
+static struct power_supply_desc mt6370_chg_psy_desc = {
+	.type = POWER_SUPPLY_TYPE_USB,
+	.properties = mt6370_chg_properties,
+	.num_properties = ARRAY_SIZE(mt6370_chg_properties),
+	.get_property = mt6370_chg_get_property,
+	.set_property = mt6370_chg_set_property,
+	.property_is_writeable = mt6370_chg_property_is_writeable,
+	.usb_types = mt6370_chg_usb_types,
+	.num_usb_types = ARRAY_SIZE(mt6370_chg_usb_types),
+};
+
+static const struct regulator_ops mt6370_chg_otg_ops = {
+	.list_voltage = regulator_list_voltage_linear,
+	.enable = regulator_enable_regmap,
+	.disable = regulator_disable_regmap,
+	.is_enabled = regulator_is_enabled_regmap,
+	.set_voltage_sel = regulator_set_voltage_sel_regmap,
+	.get_voltage_sel = regulator_get_voltage_sel_regmap,
+	.set_current_limit = regulator_set_current_limit_regmap,
+	.get_current_limit = regulator_get_current_limit_regmap,
+};
+
+static const struct regulator_desc mt6370_chg_otg_rdesc = {
+	.of_match = "usb-otg-vbus-regulator",
+	.of_parse_cb = mt6370_chg_otg_of_parse_cb,
+	.name = "mt6370-usb-otg-vbus",
+	.ops = &mt6370_chg_otg_ops,
+	.owner = THIS_MODULE,
+	.type = REGULATOR_VOLTAGE,
+	.min_uV = 4425000,
+	.uV_step = 25000,
+	.n_voltages = 57,
+	.vsel_reg = MT6370_REG_CHG_CTRL5,
+	.vsel_mask = MT6370_VOBST_MASK,
+	.enable_reg = MT6370_REG_CHG_CTRL1,
+	.enable_mask = MT6370_OPA_MODE_MASK,
+	.curr_table = mt6370_chg_otg_oc_ma,
+	.n_current_limits = ARRAY_SIZE(mt6370_chg_otg_oc_ma),
+	.csel_reg = MT6370_REG_CHG_CTRL10,
+	.csel_mask = MT6370_OTG_OC_MASK,
+};
+
+static int mt6370_chg_init_rmap_fields(struct mt6370_priv *priv)
+{
+	int i;
+	const struct mt6370_chg_field *fds = mt6370_chg_fields;
+
+	for (i = 0; i < F_MAX; i++) {
+		priv->rmap_fields[i] = devm_regmap_field_alloc(priv->dev,
+							       priv->regmap,
+							       fds[i].field);
+		if (IS_ERR(priv->rmap_fields[i])) {
+			dev_err(priv->dev,
+				"Failed to allocate regmap field [%s]\n",
+				fds[i].name);
+			return PTR_ERR(priv->rmap_fields[i]);
+		}
+	}
+
+	return 0;
+}
+
+static int mt6370_chg_init_setting(struct mt6370_priv *priv)
+{
+	int ret;
+
+	priv->wq = create_singlethread_workqueue(dev_name(priv->dev));
+	if (IS_ERR(priv->wq)) {
+		dev_err(priv->dev, "Failed to create workqueue\n");
+		return PTR_ERR(priv->wq);
+	}
+
+	INIT_WORK(&priv->bc12_work, mt6370_chg_bc12_work_func);
+	INIT_DELAYED_WORK(&priv->mivr_dwork, mt6370_chg_mivr_dwork_func);
+	mutex_init(&priv->attach_lock);
+	atomic_set(&priv->attach, 0);
+
+	/* Disable usb_chg_en */
+	ret = mt6370_chg_field_set(priv, F_USBCHGEN, 0);
+	if (ret < 0) {
+		dev_err(priv->dev, "Failed to disable usb_chg_en\n");
+		return ret;
+	}
+
+	/* ICHG/IEOC Workaroud, ICHG can not be set less than 900mA */
+	ret = mt6370_chg_field_set(priv, F_ICHG, 900);
+	if (ret < 0) {
+		dev_err(priv->dev, "Failed to set ICHG to 900mA");
+		return ret;
+	}
+
+	/* Change input current limit selection to using IAICR results */
+	ret = mt6370_chg_field_set(priv, F_IINLMTSEL, 3);
+	if (ret < 0) {
+		dev_err(priv->dev, "Failed to set IINLMTSEL\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+#define MT6370_CHG_DT_PROP_DECL(_name, _type, _field)	\
+{							\
+	.name = "mediatek,chg-" #_name,			\
+	.type = MT6370_PARSE_TYPE_##_type,		\
+	.fd = _field,					\
+}
+
+static int mt6370_chg_init_otg_regulator(struct mt6370_priv *priv)
+{
+	struct regulator_config rcfg = {
+		.dev = priv->dev,
+		.regmap = priv->regmap,
+		.driver_data = priv,
+	};
+
+	priv->rdev = devm_regulator_register(priv->dev, &mt6370_chg_otg_rdesc,
+					     &rcfg);
+
+	return IS_ERR(priv->rdev) ? PTR_ERR(priv->rdev) : 0;
+}
+
+static int mt6370_chg_init_psy(struct mt6370_priv *priv)
+{
+	struct power_supply_config cfg = {
+		.drv_data = priv,
+		.of_node = priv->dev->of_node,
+	};
+
+	priv->psy_desc = &mt6370_chg_psy_desc;
+	priv->psy_desc->name = dev_name(priv->dev);
+	priv->psy = devm_power_supply_register(priv->dev, priv->psy_desc, &cfg);
+
+	return IS_ERR(priv->psy) ? PTR_ERR(priv->psy) : 0;
+}
+
+static irqreturn_t mt6370_attach_i_handler(int irq, void *data)
+{
+	struct mt6370_priv *priv = data;
+	u32 otg_en;
+	int ret;
+
+	/* Check in otg mode or not */
+	ret = mt6370_chg_field_get(priv, F_BOOST_STAT, &otg_en);
+	if (ret < 0) {
+		dev_err(priv->dev, "failed to get otg state\n");
+		return IRQ_HANDLED;
+	}
+
+	if (otg_en)
+		return IRQ_HANDLED;
+
+	mutex_lock(&priv->attach_lock);
+	atomic_set(&priv->attach, MT6370_ATTACH_STAT_ATTACH_BC12_DONE);
+	mutex_unlock(&priv->attach_lock);
+
+	if (!queue_work(priv->wq, &priv->bc12_work))
+		dev_err(priv->dev, "bc12 work has already queued\n");
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t mt6370_uvp_d_evt_handler(int irq, void *data)
+{
+	struct mt6370_priv *priv = data;
+
+	mt6370_chg_pwr_rdy_check(priv);
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t mt6370_mivr_handler(int irq, void *data)
+{
+	struct mt6370_priv *priv = data;
+
+	pm_stay_awake(priv->dev);
+	mt6370_chg_enable_irq(priv, "mivr", false);
+	schedule_delayed_work(&priv->mivr_dwork, msecs_to_jiffies(200));
+
+	return IRQ_HANDLED;
+}
+
+#define MT6370_CHG_IRQ(_name)						\
+{									\
+	.name = #_name,							\
+	.handler = mt6370_##_name##_handler,				\
+}
+
+static int mt6370_chg_init_irq(struct mt6370_priv *priv)
+{
+	int i, ret;
+	const struct {
+		char *name;
+		irq_handler_t handler;
+	} mt6370_chg_irqs[] = {
+		MT6370_CHG_IRQ(attach_i),
+		MT6370_CHG_IRQ(uvp_d_evt),
+		MT6370_CHG_IRQ(mivr),
+	};
+
+	for (i = 0; i < ARRAY_SIZE(mt6370_chg_irqs); i++) {
+		ret = platform_get_irq_byname(to_platform_device(priv->dev),
+					      mt6370_chg_irqs[i].name);
+		if (ret < 0) {
+			dev_err(priv->dev, "Failed to get irq %s\n",
+				mt6370_chg_irqs[i].name);
+			return ret;
+		}
+
+		ret = devm_request_threaded_irq(priv->dev, ret, NULL,
+						mt6370_chg_irqs[i].handler,
+						IRQF_TRIGGER_FALLING,
+						dev_name(priv->dev),
+						priv);
+
+		if (ret < 0) {
+			dev_err(priv->dev, "Failed to request irq %s\n",
+				mt6370_chg_irqs[i].name);
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
+static int mt6370_chg_probe(struct platform_device *pdev)
+{
+	int ret;
+	struct mt6370_priv *priv;
+
+	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	priv->dev = &pdev->dev;
+
+	priv->regmap = dev_get_regmap(pdev->dev.parent, NULL);
+	if (!priv->regmap) {
+		dev_err(&pdev->dev, "Failed to get regmap\n");
+		return -ENODEV;
+	}
+
+	ret = mt6370_chg_init_rmap_fields(priv);
+	if (ret) {
+		dev_err(&pdev->dev, "Failed to init regmap fields\n");
+		return ret;
+	}
+
+	platform_set_drvdata(pdev, priv);
+
+	priv->iio_adcs = devm_iio_channel_get_all(priv->dev);
+	if (IS_ERR(priv->iio_adcs)) {
+		dev_err(&pdev->dev, "Failed to get iio adc\n");
+		return PTR_ERR(priv->iio_adcs);
+	}
+
+	ret = mt6370_chg_init_otg_regulator(priv);
+	if (ret) {
+		dev_err(&pdev->dev, "Failed to init otg regulator\n");
+		return ret;
+	}
+
+	ret = mt6370_chg_init_psy(priv);
+	if (ret) {
+		dev_err(&pdev->dev, "Failed to init psy\n");
+		return ret;
+	}
+
+	ret = mt6370_chg_init_setting(priv);
+	if (ret) {
+		dev_err(&pdev->dev, "Failed to init mt6370 private data\n");
+		goto probe_out;
+	}
+
+	ret = mt6370_chg_init_irq(priv);
+	if (ret) {
+		dev_err(&pdev->dev, "Failed to init irq\n");
+		goto probe_out;
+	}
+
+	mt6370_chg_pwr_rdy_check(priv);
+
+	return 0;
+
+probe_out:
+	destroy_workqueue(priv->wq);
+	mutex_destroy(&priv->attach_lock);
+
+	return ret;
+}
+
+static int mt6370_chg_remove(struct platform_device *pdev)
+{
+	struct mt6370_priv *priv = platform_get_drvdata(pdev);
+
+	if (priv) {
+		mt6370_chg_enable_irq(priv, "mivr", false);
+		cancel_delayed_work_sync(&priv->mivr_dwork);
+		destroy_workqueue(priv->wq);
+		mutex_destroy(&priv->attach_lock);
+	}
+
+	return 0;
+}
+
+static const struct of_device_id mt6370_chg_of_match[] = {
+	{ .compatible = "mediatek,mt6370-charger", },
+	{}
+};
+MODULE_DEVICE_TABLE(of, mt6370_chg_of_match);
+
+static struct platform_driver mt6370_chg_driver = {
+	.probe = mt6370_chg_probe,
+	.remove = mt6370_chg_remove,
+	.driver = {
+		.name = "mt6370-charger",
+		.of_match_table = of_match_ptr(mt6370_chg_of_match),
+	},
+};
+module_platform_driver(mt6370_chg_driver);
+
+MODULE_AUTHOR("ChiaEn Wu <chiaen_wu@richtek.com>");
+MODULE_DESCRIPTION("Mediatek MT6370 Charger Driver");
+MODULE_LICENSE("GPL v2");
-- 
2.25.1