path: root/drivers/power/supply/twl6030_charger.c

// SPDX-License-Identifier: GPL-2.0
/*
 * TWL6030 charger
 *
 * Copyright (C) 2024 Andreas Kemnade <andreas@kemnade.info>
 *
 * based on older 6030 driver found in a v3.0 vendor kernel
 *
 * based on twl4030_bci_battery.c by TI
 * Copyright (C) 2008 Texas Instruments, Inc.
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/of.h>
#include <linux/bits.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/mfd/twl.h>
#include <linux/power_supply.h>
#include <linux/notifier.h>
#include <linux/usb/otg.h>
#include <linux/iio/consumer.h>
#include <linux/devm-helpers.h>

#define CONTROLLER_INT_MASK	0x00
#define CONTROLLER_CTRL1	0x01
#define CONTROLLER_WDG		0x02
#define CONTROLLER_STAT1	0x03
#define CHARGERUSB_INT_STATUS	0x04
#define CHARGERUSB_INT_MASK	0x05
#define CHARGERUSB_STATUS_INT1	0x06
#define CHARGERUSB_STATUS_INT2	0x07
#define CHARGERUSB_CTRL1	0x08
#define CHARGERUSB_CTRL2	0x09
#define CHARGERUSB_CTRL3	0x0A
#define CHARGERUSB_STAT1	0x0B
#define CHARGERUSB_VOREG	0x0C
#define CHARGERUSB_VICHRG	0x0D
#define CHARGERUSB_CINLIMIT	0x0E
#define CHARGERUSB_CTRLLIMIT1	0x0F
#define CHARGERUSB_CTRLLIMIT2	0x10
#define ANTICOLLAPSE_CTRL1	0x11
#define ANTICOLLAPSE_CTRL2	0x12

/* TWL6032 registers 0xDA to 0xDE - TWL6032_MODULE_CHARGER */
#define CONTROLLER_CTRL2	0x00
#define CONTROLLER_VSEL_COMP	0x01
#define CHARGERUSB_VSYSREG	0x02
#define CHARGERUSB_VICHRG_PC	0x03
#define LINEAR_CHRG_STS		0x04

#define LINEAR_CHRG_STS_CRYSTL_OSC_OK	0x40
#define LINEAR_CHRG_STS_END_OF_CHARGE	0x20
#define LINEAR_CHRG_STS_VBATOV		0x10
#define LINEAR_CHRG_STS_VSYSOV		0x08
#define LINEAR_CHRG_STS_DPPM_STS	0x04
#define LINEAR_CHRG_STS_CV_STS		0x02
#define LINEAR_CHRG_STS_CC_STS		0x01

#define FG_REG_00	0x00
#define FG_REG_01	0x01
#define FG_REG_02	0x02
#define FG_REG_03	0x03
#define FG_REG_04	0x04
#define FG_REG_05	0x05
#define FG_REG_06	0x06
#define FG_REG_07	0x07
#define FG_REG_08	0x08
#define FG_REG_09	0x09
#define FG_REG_10	0x0A
#define FG_REG_11	0x0B

/* CONTROLLER_INT_MASK */
#define MVAC_FAULT		BIT(7)
#define MAC_EOC			BIT(6)
#define LINCH_GATED		BIT(5)
#define MBAT_REMOVED		BIT(4)
#define MFAULT_WDG		BIT(3)
#define MBAT_TEMP		BIT(2)
#define MVBUS_DET		BIT(1)
#define MVAC_DET		BIT(0)

/* CONTROLLER_CTRL1 */
#define CONTROLLER_CTRL1_EN_LINCH	BIT(5)
#define CONTROLLER_CTRL1_EN_CHARGER	BIT(4)
#define CONTROLLER_CTRL1_SEL_CHARGER	BIT(3)

/* CONTROLLER_STAT1 */
#define CONTROLLER_STAT1_EXTCHRG_STATZ	BIT(7)
#define CONTROLLER_STAT1_LINCH_GATED	BIT(6)
#define CONTROLLER_STAT1_CHRG_DET_N	BIT(5)
#define CONTROLLER_STAT1_FAULT_WDG	BIT(4)
#define CONTROLLER_STAT1_VAC_DET	BIT(3)
#define VAC_DET	BIT(3)
#define CONTROLLER_STAT1_VBUS_DET	BIT(2)
#define VBUS_DET	BIT(2)
#define CONTROLLER_STAT1_BAT_REMOVED	BIT(1)
#define CONTROLLER_STAT1_BAT_TEMP_OVRANGE BIT(0)

/* CHARGERUSB_INT_STATUS */
#define EN_LINCH		BIT(4)
#define CURRENT_TERM_INT	BIT(3)
#define CHARGERUSB_STAT		BIT(2)
#define CHARGERUSB_THMREG	BIT(1)
#define CHARGERUSB_FAULT	BIT(0)

/* CHARGERUSB_INT_MASK */
#define MASK_MCURRENT_TERM		BIT(3)
#define MASK_MCHARGERUSB_STAT		BIT(2)
#define MASK_MCHARGERUSB_THMREG		BIT(1)
#define MASK_MCHARGERUSB_FAULT		BIT(0)

/* CHARGERUSB_STATUS_INT1 */
#define CHARGERUSB_STATUS_INT1_TMREG	BIT(7)
#define CHARGERUSB_STATUS_INT1_NO_BAT	BIT(6)
#define CHARGERUSB_STATUS_INT1_BST_OCP	BIT(5)
#define CHARGERUSB_STATUS_INT1_TH_SHUTD	BIT(4)
#define CHARGERUSB_STATUS_INT1_BAT_OVP	BIT(3)
#define CHARGERUSB_STATUS_INT1_POOR_SRC	BIT(2)
#define CHARGERUSB_STATUS_INT1_SLP_MODE	BIT(1)
#define CHARGERUSB_STATUS_INT1_VBUS_OVP	BIT(0)

/* CHARGERUSB_STATUS_INT2 */
#define ICCLOOP		BIT(3)
#define CURRENT_TERM	BIT(2)
#define CHARGE_DONE	BIT(1)
#define ANTICOLLAPSE	BIT(0)

/* CHARGERUSB_CTRL1 */
#define SUSPEND_BOOT	BIT(7)
#define OPA_MODE	BIT(6)
#define HZ_MODE		BIT(5)
#define TERM		BIT(4)

/* CHARGERUSB_CTRL2 */
#define UA_TO_VITERM(x) (((x) / 50000 - 1) << 5)

/* CHARGERUSB_CTRL3 */
#define VBUSCHRG_LDO_OVRD	BIT(7)
#define CHARGE_ONCE		BIT(6)
#define BST_HW_PR_DIS		BIT(5)
#define AUTOSUPPLY		BIT(3)
#define BUCK_HSILIM		BIT(0)

/* CHARGERUSB_VOREG */
#define UV_TO_VOREG(x) (((x) - 3500000) / 20000)
#define VOREG_TO_UV(x) (((x) & 0x3F) * 20000 + 3500000)
#define CHARGERUSB_VOREG_3P52		0x01
#define CHARGERUSB_VOREG_4P0		0x19
#define CHARGERUSB_VOREG_4P2		0x23
#define CHARGERUSB_VOREG_4P76		0x3F

/* CHARGERUSB_VICHRG */
/*
 * might be inaccurate for < 500 mA, diffent scale might apply,
 * either starting from 100 mA or 300 mA
 */
#define UA_TO_VICHRG(x) (((x) / 100000) - 1)
#define VICHRG_TO_UA(x) (((x) & 0xf) * 100000 + 100000)

/* CHARGERUSB_CINLIMIT */
#define CHARGERUSB_CIN_LIMIT_100	0x1
#define CHARGERUSB_CIN_LIMIT_300	0x5
#define CHARGERUSB_CIN_LIMIT_500	0x9
#define CHARGERUSB_CIN_LIMIT_NONE	0xF

/* CHARGERUSB_CTRLLIMIT2 */
#define CHARGERUSB_CTRLLIMIT2_1500	0x0E
#define		LOCK_LIMIT		BIT(4)

/* ANTICOLLAPSE_CTRL2 */
#define BUCK_VTH_SHIFT			5

/* FG_REG_00 */
#define CC_ACTIVE_MODE_SHIFT	6
#define CC_AUTOCLEAR		BIT(2)
#define CC_CAL_EN		BIT(1)
#define CC_PAUSE		BIT(0)

#define REG_TOGGLE1		0x90
#define REG_PWDNSTATUS1		0x93
#define FGDITHS			BIT(7)
#define FGDITHR			BIT(6)
#define FGS			BIT(5)
#define FGR			BIT(4)
#define BBSPOR_CFG		0xE6
#define	BB_CHG_EN		BIT(3)

struct twl6030_charger_info {
	struct device		*dev;
	struct power_supply	*usb;
	struct power_supply_battery_info *binfo;
	struct work_struct	work;
	int			irq_chg;
	int			input_current_limit;
	struct iio_channel	*channel_vusb;
	struct delayed_work	charger_monitor;
	bool			extended_current_range;
};

struct twl6030_charger_chip_data {
	bool extended_current_range;
};

static int twl6030_charger_read(u8 reg, u8 *val)
{
	return twl_i2c_read_u8(TWL_MODULE_MAIN_CHARGE, val, reg);
}

static int twl6030_charger_write(u8 reg, u8 val)
{
	return twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, val, reg);
}

static int twl6030_config_cinlimit_reg(struct twl6030_charger_info *charger,
				       unsigned int ua)
{
	if (ua >= 50000 && ua <= 750000) {
		ua = (ua - 50000) / 50000;
	} else if ((ua > 750000) && (ua <= 1500000) && charger->extended_current_range) {
		ua = ((ua % 100000) ? 0x30 : 0x20) + ((ua - 100000) / 100000);
	} else {
		if (ua < 50000) {
			dev_err(charger->dev, "invalid input current limit\n");
			return -EINVAL;
		}
		/* This is no current limit */
		ua = 0x0F;
	}

	return twl6030_charger_write(CHARGERUSB_CINLIMIT, ua);
}

/*
 * rewriting all stuff here, resets to extremely conservative defaults were
 * seen under some circumstances, like charge voltage to 3.5V
 */
static int twl6030_enable_usb(struct twl6030_charger_info *charger)
{
	int ret;

	ret = twl6030_charger_write(CHARGERUSB_VICHRG,
				    UA_TO_VICHRG(charger->binfo->constant_charge_current_max_ua));
	if (ret < 0)
		return ret;

	ret = twl6030_charger_write(CONTROLLER_WDG, 0xff);
	if (ret < 0)
		return ret;

	charger->input_current_limit = 500000;
	ret = twl6030_config_cinlimit_reg(charger, charger->input_current_limit);
	if (ret < 0)
		return ret;

	ret = twl6030_charger_write(CHARGERUSB_CINLIMIT, CHARGERUSB_CIN_LIMIT_500);
	if (ret < 0)
		return ret;

	ret = twl6030_charger_write(CHARGERUSB_VOREG,
				    UV_TO_VOREG(charger->binfo->constant_charge_voltage_max_uv));
	if (ret < 0)
		return ret;

	ret = twl6030_charger_write(CHARGERUSB_CTRL1, TERM);
	if (ret < 0)
		return ret;

	if (charger->binfo->charge_term_current_ua != -EINVAL) {
		ret = twl6030_charger_write(CHARGERUSB_CTRL2,
					    UA_TO_VITERM(charger->binfo->charge_term_current_ua));
		if (ret < 0)
			return ret;
	}

	return twl6030_charger_write(CONTROLLER_CTRL1, CONTROLLER_CTRL1_EN_CHARGER);
}

static void twl6030_charger_wdg(struct work_struct *data)
{
	struct twl6030_charger_info *charger =
		container_of(data, struct twl6030_charger_info,
			     charger_monitor.work);

	u8 val;
	u8 int_stat;
	u8 stat_int1;
	u8 stat_int2;

	twl6030_charger_read(CONTROLLER_STAT1, &val);
	twl6030_charger_read(CHARGERUSB_INT_STATUS, &int_stat);
	twl6030_charger_read(CHARGERUSB_STATUS_INT1, &stat_int1);
	twl6030_charger_read(CHARGERUSB_STATUS_INT2, &stat_int2);
	dev_dbg(charger->dev,
		"wdg: stat1: %02x %s INT_STATUS %02x STATUS_INT1 %02x STATUS_INT2 %02x\n",
		val, (val & VBUS_DET) ? "usb online" :  "usb offline",
		int_stat, stat_int1, stat_int2);

	twl6030_charger_write(CONTROLLER_WDG, 0xff);
	schedule_delayed_work(&charger->charger_monitor,
			      msecs_to_jiffies(10000));
}

static irqreturn_t twl6030_charger_interrupt(int irq, void *arg)
{
	struct twl6030_charger_info *charger = arg;
	u8 val;
	u8 int_stat;
	u8 stat_int1;
	u8 stat_int2;

	if (twl6030_charger_read(CONTROLLER_STAT1, &val) < 0)
		return IRQ_HANDLED;

	if (twl6030_charger_read(CHARGERUSB_INT_STATUS, &int_stat) < 0)
		return IRQ_HANDLED;

	if (twl6030_charger_read(CHARGERUSB_STATUS_INT1, &stat_int1) < 0)
		return IRQ_HANDLED;

	if (twl6030_charger_read(CHARGERUSB_STATUS_INT2, &stat_int2) < 0)
		return IRQ_HANDLED;

	dev_dbg(charger->dev,
		"charger irq: stat1: %02x %s INT_STATUS %02x STATUS_INT1 %02x STATUS_INT2 %02x\n",
		val, (val & VBUS_DET) ? "usb online" :  "usb offline",
		int_stat, stat_int1, stat_int2);
	power_supply_changed(charger->usb);

	if (val & VBUS_DET) {
		if (twl6030_charger_read(CONTROLLER_CTRL1, &val) < 0)
			return IRQ_HANDLED;

		if (!(val & CONTROLLER_CTRL1_EN_CHARGER)) {
			if (twl6030_enable_usb(charger) < 0)
				return IRQ_HANDLED;

			schedule_delayed_work(&charger->charger_monitor,
					      msecs_to_jiffies(10000));
		}
	} else {
		cancel_delayed_work(&charger->charger_monitor);
	}
	return IRQ_HANDLED;
}

static int twl6030_charger_usb_get_property(struct power_supply *psy,
					    enum power_supply_property psp,
					    union power_supply_propval *val)
{
	struct twl6030_charger_info *charger = power_supply_get_drvdata(psy);
	int ret;
	u8 stat1;
	u8 intstat;

	ret = twl6030_charger_read(CONTROLLER_STAT1, &stat1);
	if (ret)
		return ret;

	switch (psp) {
	case POWER_SUPPLY_PROP_STATUS:
		if (!(stat1 & VBUS_DET)) {
			val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
			break;
		}
		ret = twl6030_charger_read(CHARGERUSB_STATUS_INT2, &intstat);
		if (ret)
			return ret;

		if (intstat & CHARGE_DONE)
			val->intval = POWER_SUPPLY_STATUS_FULL;
		else if (intstat & CURRENT_TERM)
			val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
		else
			val->intval = POWER_SUPPLY_STATUS_CHARGING;
		break;
	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
		if (!charger->channel_vusb)
			return -ENODATA;

		ret = iio_read_channel_processed_scale(charger->channel_vusb, &val->intval, 1000);
		if (ret < 0)
			return ret;

		break;
	case POWER_SUPPLY_PROP_ONLINE:
		val->intval = !!(stat1 & VBUS_DET);
		break;
	case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
		val->intval = charger->input_current_limit;
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

static int twl6030_charger_usb_set_property(struct power_supply *psy,
					    enum power_supply_property psp,
					    const union power_supply_propval *val)
{
	struct twl6030_charger_info *charger = power_supply_get_drvdata(psy);

	switch (psp) {
	case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
		charger->input_current_limit = val->intval;
		return twl6030_config_cinlimit_reg(charger, charger->input_current_limit);
	default:
		return -EINVAL;
	}

	return 0;
}

static int twl6030_charger_usb_property_is_writeable(struct power_supply *psy,
						     enum power_supply_property psp)
{
	dev_info(&psy->dev, "is %d writeable?\n", (int)psp);
	switch (psp) {
	case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
		return true;
	default:
		return false;
	}
}

static enum power_supply_property twl6030_charger_props[] = {
	POWER_SUPPLY_PROP_STATUS,
	POWER_SUPPLY_PROP_ONLINE,
	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT,
};

static const struct power_supply_desc twl6030_charger_usb_desc = {
	.name		= "twl6030_usb",
	.type		= POWER_SUPPLY_TYPE_USB,
	.properties	= twl6030_charger_props,
	.num_properties	= ARRAY_SIZE(twl6030_charger_props),
	.get_property	= twl6030_charger_usb_get_property,
	.set_property	= twl6030_charger_usb_set_property,
	.property_is_writeable	= twl6030_charger_usb_property_is_writeable,
};

static int twl6030_charger_probe(struct platform_device *pdev)
{
	struct twl6030_charger_info *charger;
	const struct twl6030_charger_chip_data *chip_data;
	struct power_supply_config psy_cfg = {};
	int ret;
	u8 val;

	charger = devm_kzalloc(&pdev->dev, sizeof(*charger), GFP_KERNEL);
	if (!charger)
		return -ENOMEM;

	charger->dev = &pdev->dev;
	charger->irq_chg = platform_get_irq(pdev, 0);

	chip_data = device_get_match_data(&pdev->dev);
	if (!chip_data)
		return dev_err_probe(&pdev->dev, -EINVAL, "missing chip data\n");

	charger->extended_current_range = chip_data->extended_current_range;
	platform_set_drvdata(pdev, charger);
	psy_cfg.drv_data = charger;
	psy_cfg.fwnode = dev_fwnode(&pdev->dev);

	charger->channel_vusb = devm_iio_channel_get(&pdev->dev, "vusb");
	if (IS_ERR(charger->channel_vusb)) {
		ret = PTR_ERR(charger->channel_vusb);
		if (ret == -EPROBE_DEFER)
			return ret;	/* iio not ready */
		dev_warn(&pdev->dev, "could not request vusb iio channel (%d)",
			 ret);
		charger->channel_vusb = NULL;
	}

	charger->usb = devm_power_supply_register(&pdev->dev,
						  &twl6030_charger_usb_desc,
						  &psy_cfg);
	if (IS_ERR(charger->usb))
		return dev_err_probe(&pdev->dev, PTR_ERR(charger->usb),
				     "Failed to register usb\n");

	ret = power_supply_get_battery_info(charger->usb, &charger->binfo);
	if (ret < 0)
		return dev_err_probe(&pdev->dev, ret,
				     "Failed to get battery info\n");

	dev_info(&pdev->dev, "battery with vmax %d imax: %d\n",
		 charger->binfo->constant_charge_voltage_max_uv,
		 charger->binfo->constant_charge_current_max_ua);

	if (charger->binfo->constant_charge_voltage_max_uv == -EINVAL) {
		ret = twl6030_charger_read(CHARGERUSB_CTRLLIMIT1, &val);
		if (ret < 0)
			return ret;

		charger->binfo->constant_charge_voltage_max_uv =
			VOREG_TO_UV(val);
	}

	if (charger->binfo->constant_charge_voltage_max_uv > 4760000 ||
	    charger->binfo->constant_charge_voltage_max_uv < 350000)
		return dev_err_probe(&pdev->dev, -EINVAL,
				     "Invalid charge voltage\n");

	if (charger->binfo->constant_charge_current_max_ua == -EINVAL) {
		ret = twl6030_charger_read(CHARGERUSB_CTRLLIMIT2, &val);
		if (ret < 0)
			return ret;

		charger->binfo->constant_charge_current_max_ua = VICHRG_TO_UA(val);
	}

	if (charger->binfo->constant_charge_current_max_ua < 100000 ||
	    charger->binfo->constant_charge_current_max_ua > 1500000) {
		return dev_err_probe(&pdev->dev, -EINVAL,
			 "Invalid charge current\n");
	}

	if ((charger->binfo->charge_term_current_ua != -EINVAL) &&
	    (charger->binfo->charge_term_current_ua > 400000 ||
	     charger->binfo->charge_term_current_ua < 50000)) {
		return dev_err_probe(&pdev->dev, -EINVAL,
			"Invalid charge termination current\n");
	}

	ret = devm_delayed_work_autocancel(&pdev->dev,
					   &charger->charger_monitor,
					   twl6030_charger_wdg);
	if (ret < 0)
		return dev_err_probe(&pdev->dev, ret,
				     "Failed to register delayed work\n");

	ret = devm_request_threaded_irq(&pdev->dev, charger->irq_chg, NULL,
					twl6030_charger_interrupt,
					IRQF_ONESHOT, pdev->name,
					charger);
	if (ret < 0)
		return dev_err_probe(&pdev->dev, ret,
				     "could not request irq %d\n",
				     charger->irq_chg);

	/* turing to charging to configure things */
	twl6030_charger_write(CONTROLLER_CTRL1, 0);
	twl6030_charger_interrupt(0, charger);

	return 0;
}

static const struct twl6030_charger_chip_data twl6030_data = {
	.extended_current_range = false,
};

static const struct twl6030_charger_chip_data twl6032_data = {
	.extended_current_range = true,
};

static const struct of_device_id twl_charger_of_match[] = {
	{.compatible = "ti,twl6030-charger", .data = &twl6030_data},
	{.compatible = "ti,twl6032-charger", .data = &twl6032_data},
	{ }
};
MODULE_DEVICE_TABLE(of, twl_charger_of_match);

static struct platform_driver twl6030_charger_driver = {
	.probe = twl6030_charger_probe,
	.driver	= {
		.name	= "twl6030_charger",
		.of_match_table = twl_charger_of_match,
	},
};
module_platform_driver(twl6030_charger_driver);

MODULE_DESCRIPTION("TWL6030 Battery Charger Interface driver");
MODULE_LICENSE("GPL");