[deliverable/linux.git] / drivers / power / supply / act8945a_charger.c

/*
 * Power supply driver for the Active-semi ACT8945A PMIC
 *
 * Copyright (C) 2015 Atmel Corporation
 *
 * Author: Wenyou Yang <wenyou.yang@atmel.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 */
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_gpio.h>
#include <linux/of_irq.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/regmap.h>
#include <linux/gpio/consumer.h>

static const char *act8945a_charger_model = "ACT8945A";
static const char *act8945a_charger_manufacturer = "Active-semi";

/**
 * ACT8945A Charger Register Map
 */

/* 0x70: Reserved */
#define ACT8945A_APCH_CFG		0x71
#define ACT8945A_APCH_STATUS		0x78
#define ACT8945A_APCH_CTRL		0x79
#define ACT8945A_APCH_STATE		0x7A

/* ACT8945A_APCH_CFG */
#define APCH_CFG_OVPSET			(0x3 << 0)
#define APCH_CFG_OVPSET_6V6		(0x0 << 0)
#define APCH_CFG_OVPSET_7V		(0x1 << 0)
#define APCH_CFG_OVPSET_7V5		(0x2 << 0)
#define APCH_CFG_OVPSET_8V		(0x3 << 0)
#define APCH_CFG_PRETIMO		(0x3 << 2)
#define APCH_CFG_PRETIMO_40_MIN		(0x0 << 2)
#define APCH_CFG_PRETIMO_60_MIN		(0x1 << 2)
#define APCH_CFG_PRETIMO_80_MIN		(0x2 << 2)
#define APCH_CFG_PRETIMO_DISABLED	(0x3 << 2)
#define APCH_CFG_TOTTIMO		(0x3 << 4)
#define APCH_CFG_TOTTIMO_3_HOUR		(0x0 << 4)
#define APCH_CFG_TOTTIMO_4_HOUR		(0x1 << 4)
#define APCH_CFG_TOTTIMO_5_HOUR		(0x2 << 4)
#define APCH_CFG_TOTTIMO_DISABLED	(0x3 << 4)
#define APCH_CFG_SUSCHG			(0x1 << 7)

#define APCH_STATUS_CHGDAT		BIT(0)
#define APCH_STATUS_INDAT		BIT(1)
#define APCH_STATUS_TEMPDAT		BIT(2)
#define APCH_STATUS_TIMRDAT		BIT(3)
#define APCH_STATUS_CHGSTAT		BIT(4)
#define APCH_STATUS_INSTAT		BIT(5)
#define APCH_STATUS_TEMPSTAT		BIT(6)
#define APCH_STATUS_TIMRSTAT		BIT(7)

#define APCH_CTRL_CHGEOCOUT		BIT(0)
#define APCH_CTRL_INDIS			BIT(1)
#define APCH_CTRL_TEMPOUT		BIT(2)
#define APCH_CTRL_TIMRPRE		BIT(3)
#define APCH_CTRL_CHGEOCIN		BIT(4)
#define APCH_CTRL_INCON			BIT(5)
#define APCH_CTRL_TEMPIN		BIT(6)
#define APCH_CTRL_TIMRTOT		BIT(7)

#define APCH_STATE_ACINSTAT		(0x1 << 1)
#define APCH_STATE_CSTATE		(0x3 << 4)
#define APCH_STATE_CSTATE_SHIFT		4
#define APCH_STATE_CSTATE_DISABLED	0x00
#define APCH_STATE_CSTATE_EOC		0x01
#define APCH_STATE_CSTATE_FAST		0x02
#define APCH_STATE_CSTATE_PRE		0x03

struct act8945a_charger {
	struct power_supply *psy;
	struct power_supply_desc desc;
	struct regmap *regmap;
	struct work_struct work;

	bool init_done;
	struct gpio_desc *lbo_gpio;
};

static int act8945a_get_charger_state(struct regmap *regmap, int *val)
{
	int ret;
	unsigned int status, state;

	ret = regmap_read(regmap, ACT8945A_APCH_STATUS, &status);
	if (ret < 0)
		return ret;

	ret = regmap_read(regmap, ACT8945A_APCH_STATE, &state);
	if (ret < 0)
		return ret;

	state &= APCH_STATE_CSTATE;
	state >>= APCH_STATE_CSTATE_SHIFT;

	switch (state) {
	case APCH_STATE_CSTATE_PRE:
	case APCH_STATE_CSTATE_FAST:
		*val = POWER_SUPPLY_STATUS_CHARGING;
		break;
	case APCH_STATE_CSTATE_EOC:
		if (status & APCH_STATUS_CHGDAT)
			*val = POWER_SUPPLY_STATUS_FULL;
		else
			*val = POWER_SUPPLY_STATUS_CHARGING;
		break;
	case APCH_STATE_CSTATE_DISABLED:
	default:
		if (!(status & APCH_STATUS_INDAT))
			*val = POWER_SUPPLY_STATUS_DISCHARGING;
		else
			*val = POWER_SUPPLY_STATUS_NOT_CHARGING;
		break;
	}

	return 0;
}

static int act8945a_get_charge_type(struct regmap *regmap, int *val)
{
	int ret;
	unsigned int status, state;

	ret = regmap_read(regmap, ACT8945A_APCH_STATUS, &status);
	if (ret < 0)
		return ret;

	ret = regmap_read(regmap, ACT8945A_APCH_STATE, &state);
	if (ret < 0)
		return ret;

	state &= APCH_STATE_CSTATE;
	state >>= APCH_STATE_CSTATE_SHIFT;

	switch (state) {
	case APCH_STATE_CSTATE_PRE:
		*val = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
		break;
	case APCH_STATE_CSTATE_FAST:
		*val = POWER_SUPPLY_CHARGE_TYPE_FAST;
		break;
	case APCH_STATE_CSTATE_EOC:
		*val = POWER_SUPPLY_CHARGE_TYPE_NONE;
		break;
	case APCH_STATE_CSTATE_DISABLED:
	default:
		if (!(status & APCH_STATUS_INDAT))
			*val = POWER_SUPPLY_CHARGE_TYPE_NONE;
		else
			*val = POWER_SUPPLY_CHARGE_TYPE_UNKNOWN;
		break;
	}

	return 0;
}

static int act8945a_get_battery_health(struct regmap *regmap, int *val)
{
	int ret;
	unsigned int status, state, config;

	ret = regmap_read(regmap, ACT8945A_APCH_STATUS, &status);
	if (ret < 0)
		return ret;

	ret = regmap_read(regmap, ACT8945A_APCH_CFG, &config);
	if (ret < 0)
		return ret;

	ret = regmap_read(regmap, ACT8945A_APCH_STATE, &state);
	if (ret < 0)
		return ret;

	state &= APCH_STATE_CSTATE;
	state >>= APCH_STATE_CSTATE_SHIFT;

	switch (state) {
	case APCH_STATE_CSTATE_DISABLED:
		if (config & APCH_CFG_SUSCHG) {
			*val = POWER_SUPPLY_HEALTH_UNKNOWN;
		} else if (status & APCH_STATUS_INDAT) {
			if (!(status & APCH_STATUS_TEMPDAT))
				*val = POWER_SUPPLY_HEALTH_OVERHEAT;
			else if (status & APCH_STATUS_TIMRDAT)
				*val = POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE;
			else
				*val = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
		} else {
			*val = POWER_SUPPLY_HEALTH_GOOD;
		}
		break;
	case APCH_STATE_CSTATE_PRE:
	case APCH_STATE_CSTATE_FAST:
	case APCH_STATE_CSTATE_EOC:
	default:
		*val = POWER_SUPPLY_HEALTH_GOOD;
		break;
	}

	return 0;
}

static int act8945a_get_capacity_level(struct act8945a_charger *charger,
				       struct regmap *regmap, int *val)
{
	int ret;
	unsigned int status, state, config;
	int lbo_level = gpiod_get_value(charger->lbo_gpio);

	ret = regmap_read(regmap, ACT8945A_APCH_STATUS, &status);
	if (ret < 0)
		return ret;

	ret = regmap_read(regmap, ACT8945A_APCH_CFG, &config);
	if (ret < 0)
		return ret;

	ret = regmap_read(regmap, ACT8945A_APCH_STATE, &state);
	if (ret < 0)
		return ret;

	state &= APCH_STATE_CSTATE;
	state >>= APCH_STATE_CSTATE_SHIFT;

	switch (state) {
	case APCH_STATE_CSTATE_PRE:
		*val = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
		break;
	case APCH_STATE_CSTATE_FAST:
		if (lbo_level)
			*val = POWER_SUPPLY_CAPACITY_LEVEL_HIGH;
		else
			*val = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
		break;
	case APCH_STATE_CSTATE_EOC:
		if (status & APCH_STATUS_CHGDAT)
			*val = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
		else
			*val = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
		break;
	case APCH_STATE_CSTATE_DISABLED:
	default:
		if (config & APCH_CFG_SUSCHG) {
			*val = POWER_SUPPLY_CAPACITY_LEVEL_UNKNOWN;
		} else {
			*val = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
			if (!(status & APCH_STATUS_INDAT)) {
				if (!lbo_level)
					*val = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
			}
		}
		break;
	}

	return 0;
}

static enum power_supply_property act8945a_charger_props[] = {
	POWER_SUPPLY_PROP_STATUS,
	POWER_SUPPLY_PROP_CHARGE_TYPE,
	POWER_SUPPLY_PROP_TECHNOLOGY,
	POWER_SUPPLY_PROP_HEALTH,
	POWER_SUPPLY_PROP_CAPACITY_LEVEL,
	POWER_SUPPLY_PROP_MODEL_NAME,
	POWER_SUPPLY_PROP_MANUFACTURER
};

static int act8945a_charger_get_property(struct power_supply *psy,
					 enum power_supply_property prop,
					 union power_supply_propval *val)
{
	struct act8945a_charger *charger = power_supply_get_drvdata(psy);
	struct regmap *regmap = charger->regmap;
	int ret = 0;

	switch (prop) {
	case POWER_SUPPLY_PROP_STATUS:
		ret = act8945a_get_charger_state(regmap, &val->intval);
		break;
	case POWER_SUPPLY_PROP_CHARGE_TYPE:
		ret = act8945a_get_charge_type(regmap, &val->intval);
		break;
	case POWER_SUPPLY_PROP_TECHNOLOGY:
		val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
		break;
	case POWER_SUPPLY_PROP_HEALTH:
		ret = act8945a_get_battery_health(regmap, &val->intval);
		break;
	case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
		ret = act8945a_get_capacity_level(charger,
						  regmap, &val->intval);
		break;
	case POWER_SUPPLY_PROP_MODEL_NAME:
		val->strval = act8945a_charger_model;
		break;
	case POWER_SUPPLY_PROP_MANUFACTURER:
		val->strval = act8945a_charger_manufacturer;
		break;
	default:
		return -EINVAL;
	}

	return ret;
}

static int act8945a_enable_interrupt(struct act8945a_charger *charger)
{
	struct regmap *regmap = charger->regmap;
	unsigned char ctrl;
	int ret;

	ctrl = APCH_CTRL_CHGEOCOUT | APCH_CTRL_CHGEOCIN |
	       APCH_CTRL_INDIS | APCH_CTRL_INCON |
	       APCH_CTRL_TEMPOUT | APCH_CTRL_TEMPIN |
	       APCH_CTRL_TIMRPRE | APCH_CTRL_TIMRTOT;
	ret = regmap_write(regmap, ACT8945A_APCH_CTRL, ctrl);
	if (ret)
		return ret;

	ctrl = APCH_STATUS_CHGSTAT | APCH_STATUS_INSTAT |
	       APCH_STATUS_TEMPSTAT | APCH_STATUS_TIMRSTAT;
	ret = regmap_write(regmap, ACT8945A_APCH_STATUS, ctrl);
	if (ret)
		return ret;

	return 0;
}

static unsigned int act8945a_set_supply_type(struct act8945a_charger *charger,
					     unsigned int *type)
{
	unsigned int status, state;
	int ret;

	ret = regmap_read(charger->regmap, ACT8945A_APCH_STATUS, &status);
	if (ret < 0)
		return ret;

	ret = regmap_read(charger->regmap, ACT8945A_APCH_STATE, &state);
	if (ret < 0)
		return ret;

	if (status & APCH_STATUS_INDAT) {
		if (state & APCH_STATE_ACINSTAT)
			*type = POWER_SUPPLY_TYPE_MAINS;
		else
			*type = POWER_SUPPLY_TYPE_USB;
	} else {
		*type = POWER_SUPPLY_TYPE_BATTERY;
	}

	return 0;
}

static void act8945a_work(struct work_struct *work)
{
	struct act8945a_charger *charger =
			container_of(work, struct act8945a_charger, work);

	act8945a_set_supply_type(charger, &charger->desc.type);

	power_supply_changed(charger->psy);
}

static irqreturn_t act8945a_status_changed(int irq, void *dev_id)
{
	struct act8945a_charger *charger = dev_id;

	if (charger->init_done)
		schedule_work(&charger->work);

	return IRQ_HANDLED;
}

#define DEFAULT_TOTAL_TIME_OUT		3
#define DEFAULT_PRE_TIME_OUT		40
#define DEFAULT_INPUT_OVP_THRESHOLD	6600

static int act8945a_charger_config(struct device *dev,
				   struct act8945a_charger *charger)
{
	struct device_node *np = dev->of_node;
	enum of_gpio_flags flags;
	struct regmap *regmap = charger->regmap;

	u32 total_time_out;
	u32 pre_time_out;
	u32 input_voltage_threshold;
	int chglev_pin;
	int err, ret;

	unsigned int tmp;
	unsigned int value = 0;

	if (!np) {
		dev_err(dev, "no charger of node\n");
		return -EINVAL;
	}

	ret = regmap_read(regmap, ACT8945A_APCH_CFG, &tmp);
	if (ret)
		return ret;

	if (tmp & APCH_CFG_SUSCHG) {
		value |= APCH_CFG_SUSCHG;
		dev_info(dev, "have been suspended\n");
	}

	charger->lbo_gpio = devm_gpiod_get_optional(dev, "active-semi,lbo",
						    GPIOD_IN);
	if (IS_ERR(charger->lbo_gpio)) {
		err = PTR_ERR(charger->lbo_gpio);
		dev_err(dev, "unable to claim gpio \"lbo\": %d\n", err);
		return err;
	}

	ret = devm_request_irq(dev, gpiod_to_irq(charger->lbo_gpio),
			       act8945a_status_changed,
			       (IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING),
			       "act8945a_lbo_detect", charger);
	if (ret)
		dev_info(dev, "failed to request gpio \"lbo\" IRQ\n");

	chglev_pin = of_get_named_gpio_flags(np,
				"active-semi,chglev-gpios", 0, &flags);

	if (gpio_is_valid(chglev_pin)) {
		gpio_set_value(chglev_pin,
			       ((flags == OF_GPIO_ACTIVE_LOW) ? 0 : 1));
	}

	if (of_property_read_u32(np,
				 "active-semi,input-voltage-threshold-microvolt",
				 &input_voltage_threshold))
		input_voltage_threshold = DEFAULT_INPUT_OVP_THRESHOLD;

	if (of_property_read_u32(np,
				 "active-semi,precondition-timeout",
				 &pre_time_out))
		pre_time_out = DEFAULT_PRE_TIME_OUT;

	if (of_property_read_u32(np, "active-semi,total-timeout",
				 &total_time_out))
		total_time_out = DEFAULT_TOTAL_TIME_OUT;

	switch (input_voltage_threshold) {
	case 8000:
		value |= APCH_CFG_OVPSET_8V;
		break;
	case 7500:
		value |= APCH_CFG_OVPSET_7V5;
		break;
	case 7000:
		value |= APCH_CFG_OVPSET_7V;
		break;
	case 6600:
	default:
		value |= APCH_CFG_OVPSET_6V6;
		break;
	}

	switch (pre_time_out) {
	case 60:
		value |= APCH_CFG_PRETIMO_60_MIN;
		break;
	case 80:
		value |= APCH_CFG_PRETIMO_80_MIN;
		break;
	case 0:
		value |= APCH_CFG_PRETIMO_DISABLED;
		break;
	case 40:
	default:
		value |= APCH_CFG_PRETIMO_40_MIN;
		break;
	}

	switch (total_time_out) {
	case 4:
		value |= APCH_CFG_TOTTIMO_4_HOUR;
		break;
	case 5:
		value |= APCH_CFG_TOTTIMO_5_HOUR;
		break;
	case 0:
		value |= APCH_CFG_TOTTIMO_DISABLED;
		break;
	case 3:
	default:
		value |= APCH_CFG_TOTTIMO_3_HOUR;
		break;
	}

	return regmap_write(regmap, ACT8945A_APCH_CFG, value);
}

static int act8945a_charger_probe(struct platform_device *pdev)
{
	struct act8945a_charger *charger;
	struct power_supply_config psy_cfg = {};
	int irq, ret;

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

	charger->regmap = dev_get_regmap(pdev->dev.parent, NULL);
	if (!charger->regmap) {
		dev_err(&pdev->dev, "Parent did not provide regmap\n");
		return -EINVAL;
	}

	ret = act8945a_charger_config(&pdev->dev, charger);
	if (ret)
		return ret;

	irq = of_irq_get(pdev->dev.of_node, 0);
	if (irq == -EPROBE_DEFER) {
		dev_err(&pdev->dev, "failed to find IRQ number\n");
		return -EPROBE_DEFER;
	}

	ret = devm_request_irq(&pdev->dev, irq, act8945a_status_changed,
			       IRQF_TRIGGER_FALLING, "act8945a_interrupt",
			       charger);
	if (ret) {
		dev_err(&pdev->dev, "failed to request nIRQ pin IRQ\n");
		return ret;
	}

	charger->desc.name = "act8945a-charger";
	charger->desc.get_property = act8945a_charger_get_property;
	charger->desc.properties = act8945a_charger_props;
	charger->desc.num_properties = ARRAY_SIZE(act8945a_charger_props);

	ret = act8945a_set_supply_type(charger, &charger->desc.type);
	if (ret)
		return -EINVAL;

	psy_cfg.of_node	= pdev->dev.of_node;
	psy_cfg.drv_data = charger;

	charger->psy = devm_power_supply_register(&pdev->dev,
						  &charger->desc,
						  &psy_cfg);
	if (IS_ERR(charger->psy)) {
		dev_err(&pdev->dev, "failed to register power supply\n");
		return PTR_ERR(charger->psy);
	}

	platform_set_drvdata(pdev, charger);

	INIT_WORK(&charger->work, act8945a_work);

	ret = act8945a_enable_interrupt(charger);
	if (ret)
		return -EIO;

	charger->init_done = true;

	return 0;
}

static int act8945a_charger_remove(struct platform_device *pdev)
{
	struct act8945a_charger *charger = platform_get_drvdata(pdev);

	charger->init_done = false;
	cancel_work_sync(&charger->work);

	return 0;
}

static struct platform_driver act8945a_charger_driver = {
	.driver	= {
		.name = "act8945a-charger",
	},
	.probe	= act8945a_charger_probe,
	.remove = act8945a_charger_remove,
};
module_platform_driver(act8945a_charger_driver);

MODULE_DESCRIPTION("Active-semi ACT8945A ActivePath charger driver");
MODULE_AUTHOR("Wenyou Yang <wenyou.yang@atmel.com>");
MODULE_LICENSE("GPL");
Commit	Line	Data
5c0e09e0 WY	1	/*
	2	* Power supply driver for the Active-semi ACT8945A PMIC
	3	*
	4	* Copyright (C) 2015 Atmel Corporation
	5	*
	6	* Author: Wenyou Yang <wenyou.yang@atmel.com>
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License version 2 as
	10	* published by the Free Software Foundation.
	11	*
	12	*/
a09209ac	13	#include <linux/interrupt.h>
5c0e09e0 WY	14	#include <linux/module.h>
	15	#include <linux/of.h>
	16	#include <linux/of_gpio.h>
a09209ac	17	#include <linux/of_irq.h>
5c0e09e0 WY	18	#include <linux/platform_device.h>
	19	#include <linux/power_supply.h>
	20	#include <linux/regmap.h>
369eba09	21	#include <linux/gpio/consumer.h>
5c0e09e0 WY	22
	23	static const char *act8945a_charger_model = "ACT8945A";
	24	static const char *act8945a_charger_manufacturer = "Active-semi";
	25
	26	/**
	27	* ACT8945A Charger Register Map
	28	*/
	29
	30	/* 0x70: Reserved */
	31	#define ACT8945A_APCH_CFG 0x71
	32	#define ACT8945A_APCH_STATUS 0x78
	33	#define ACT8945A_APCH_CTRL 0x79
	34	#define ACT8945A_APCH_STATE 0x7A
	35
	36	/* ACT8945A_APCH_CFG */
	37	#define APCH_CFG_OVPSET (0x3 << 0)
	38	#define APCH_CFG_OVPSET_6V6 (0x0 << 0)
	39	#define APCH_CFG_OVPSET_7V (0x1 << 0)
	40	#define APCH_CFG_OVPSET_7V5 (0x2 << 0)
	41	#define APCH_CFG_OVPSET_8V (0x3 << 0)
	42	#define APCH_CFG_PRETIMO (0x3 << 2)
	43	#define APCH_CFG_PRETIMO_40_MIN (0x0 << 2)
	44	#define APCH_CFG_PRETIMO_60_MIN (0x1 << 2)
	45	#define APCH_CFG_PRETIMO_80_MIN (0x2 << 2)
	46	#define APCH_CFG_PRETIMO_DISABLED (0x3 << 2)
	47	#define APCH_CFG_TOTTIMO (0x3 << 4)
	48	#define APCH_CFG_TOTTIMO_3_HOUR (0x0 << 4)
	49	#define APCH_CFG_TOTTIMO_4_HOUR (0x1 << 4)
	50	#define APCH_CFG_TOTTIMO_5_HOUR (0x2 << 4)
	51	#define APCH_CFG_TOTTIMO_DISABLED (0x3 << 4)
	52	#define APCH_CFG_SUSCHG (0x1 << 7)
	53
	54	#define APCH_STATUS_CHGDAT BIT(0)
	55	#define APCH_STATUS_INDAT BIT(1)
	56	#define APCH_STATUS_TEMPDAT BIT(2)
	57	#define APCH_STATUS_TIMRDAT BIT(3)
	58	#define APCH_STATUS_CHGSTAT BIT(4)
	59	#define APCH_STATUS_INSTAT BIT(5)
	60	#define APCH_STATUS_TEMPSTAT BIT(6)
	61	#define APCH_STATUS_TIMRSTAT BIT(7)
	62
	63	#define APCH_CTRL_CHGEOCOUT BIT(0)
	64	#define APCH_CTRL_INDIS BIT(1)
	65	#define APCH_CTRL_TEMPOUT BIT(2)
	66	#define APCH_CTRL_TIMRPRE BIT(3)
	67	#define APCH_CTRL_CHGEOCIN BIT(4)
	68	#define APCH_CTRL_INCON BIT(5)
	69	#define APCH_CTRL_TEMPIN BIT(6)
	70	#define APCH_CTRL_TIMRTOT BIT(7)
	71
	72	#define APCH_STATE_ACINSTAT (0x1 << 1)
	73	#define APCH_STATE_CSTATE (0x3 << 4)
	74	#define APCH_STATE_CSTATE_SHIFT 4
	75	#define APCH_STATE_CSTATE_DISABLED 0x00
	76	#define APCH_STATE_CSTATE_EOC 0x01
	77	#define APCH_STATE_CSTATE_FAST 0x02
	78	#define APCH_STATE_CSTATE_PRE 0x03
	79
	80	struct act8945a_charger {
a09209ac	81	struct power_supply *psy;
10ca08b0	82	struct power_supply_desc desc;
5c0e09e0	83	struct regmap *regmap;
a09209ac WY	84	struct work_struct work;
	85
	86	bool init_done;
369eba09	87	struct gpio_desc *lbo_gpio;
5c0e09e0 WY	88	};
	89
	90	static int act8945a_get_charger_state(struct regmap regmap, int val)
	91	{
	92	int ret;
	93	unsigned int status, state;
	94
	95	ret = regmap_read(regmap, ACT8945A_APCH_STATUS, &status);
	96	if (ret < 0)
	97	return ret;
	98
	99	ret = regmap_read(regmap, ACT8945A_APCH_STATE, &state);
	100	if (ret < 0)
	101	return ret;
	102
	103	state &= APCH_STATE_CSTATE;
	104	state >>= APCH_STATE_CSTATE_SHIFT;
	105
1f0ba406 WY	106	switch (state) {
	107	case APCH_STATE_CSTATE_PRE:
	108	case APCH_STATE_CSTATE_FAST:
	109	*val = POWER_SUPPLY_STATUS_CHARGING;
	110	break;
	111	case APCH_STATE_CSTATE_EOC:
5c0e09e0 WY	112	if (status & APCH_STATUS_CHGDAT)
5c0e09e0 WY	113	*val = POWER_SUPPLY_STATUS_FULL;
1f0ba406 WY	114	else
	115	*val = POWER_SUPPLY_STATUS_CHARGING;
	116	break;
	117	case APCH_STATE_CSTATE_DISABLED:
	118	default:
	119	if (!(status & APCH_STATUS_INDAT))
	120	*val = POWER_SUPPLY_STATUS_DISCHARGING;
5c0e09e0 WY	121	else
5c0e09e0 WY	122	*val = POWER_SUPPLY_STATUS_NOT_CHARGING;
1f0ba406	123	break;
5c0e09e0 WY	124	}
	125
	126	return 0;
	127	}
	128
	129	static int act8945a_get_charge_type(struct regmap regmap, int val)
	130	{
	131	int ret;
1f0ba406 WY	132	unsigned int status, state;
	133
	134	ret = regmap_read(regmap, ACT8945A_APCH_STATUS, &status);
	135	if (ret < 0)
	136	return ret;
5c0e09e0 WY	137
	138	ret = regmap_read(regmap, ACT8945A_APCH_STATE, &state);
	139	if (ret < 0)
	140	return ret;
	141
	142	state &= APCH_STATE_CSTATE;
	143	state >>= APCH_STATE_CSTATE_SHIFT;
	144
	145	switch (state) {
	146	case APCH_STATE_CSTATE_PRE:
	147	*val = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
	148	break;
	149	case APCH_STATE_CSTATE_FAST:
	150	*val = POWER_SUPPLY_CHARGE_TYPE_FAST;
	151	break;
	152	case APCH_STATE_CSTATE_EOC:
1f0ba406 WY	153	*val = POWER_SUPPLY_CHARGE_TYPE_NONE;
1f0ba406 WY	154	break;
5c0e09e0 WY	155	case APCH_STATE_CSTATE_DISABLED:
5c0e09e0 WY	156	default:
1f0ba406 WY	157	if (!(status & APCH_STATUS_INDAT))
	158	*val = POWER_SUPPLY_CHARGE_TYPE_NONE;
	159	else
	160	*val = POWER_SUPPLY_CHARGE_TYPE_UNKNOWN;
	161	break;
5c0e09e0 WY	162	}
	163
	164	return 0;
	165	}
	166
6b021fc9	167	static int act8945a_get_battery_health(struct regmap regmap, int val)
5c0e09e0 WY	168	{
5c0e09e0 WY	169	int ret;
1f0ba406	170	unsigned int status, state, config;
5c0e09e0 WY	171
	172	ret = regmap_read(regmap, ACT8945A_APCH_STATUS, &status);
	173	if (ret < 0)
	174	return ret;
	175
1f0ba406 WY	176	ret = regmap_read(regmap, ACT8945A_APCH_CFG, &config);
	177	if (ret < 0)
	178	return ret;
	179
	180	ret = regmap_read(regmap, ACT8945A_APCH_STATE, &state);
	181	if (ret < 0)
	182	return ret;
	183
	184	state &= APCH_STATE_CSTATE;
	185	state >>= APCH_STATE_CSTATE_SHIFT;
	186
	187	switch (state) {
	188	case APCH_STATE_CSTATE_DISABLED:
	189	if (config & APCH_CFG_SUSCHG) {
	190	*val = POWER_SUPPLY_HEALTH_UNKNOWN;
	191	} else if (status & APCH_STATUS_INDAT) {
	192	if (!(status & APCH_STATUS_TEMPDAT))
	193	*val = POWER_SUPPLY_HEALTH_OVERHEAT;
	194	else if (status & APCH_STATUS_TIMRDAT)
	195	*val = POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE;
	196	else
	197	*val = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
	198	} else {
	199	*val = POWER_SUPPLY_HEALTH_GOOD;
	200	}
	201	break;
	202	case APCH_STATE_CSTATE_PRE:
	203	case APCH_STATE_CSTATE_FAST:
	204	case APCH_STATE_CSTATE_EOC:
	205	default:
5c0e09e0	206	*val = POWER_SUPPLY_HEALTH_GOOD;
1f0ba406 WY	207	break;
1f0ba406 WY	208	}
5c0e09e0 WY	209
	210	return 0;
	211	}
	212
369eba09 WY	213	static int act8945a_get_capacity_level(struct act8945a_charger *charger,
	214	struct regmap regmap, int val)
	215	{
	216	int ret;
	217	unsigned int status, state, config;
	218	int lbo_level = gpiod_get_value(charger->lbo_gpio);
	219
	220	ret = regmap_read(regmap, ACT8945A_APCH_STATUS, &status);
	221	if (ret < 0)
	222	return ret;
	223
	224	ret = regmap_read(regmap, ACT8945A_APCH_CFG, &config);
	225	if (ret < 0)
	226	return ret;
	227
	228	ret = regmap_read(regmap, ACT8945A_APCH_STATE, &state);
	229	if (ret < 0)
	230	return ret;
	231
	232	state &= APCH_STATE_CSTATE;
	233	state >>= APCH_STATE_CSTATE_SHIFT;
	234
	235	switch (state) {
	236	case APCH_STATE_CSTATE_PRE:
	237	*val = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
	238	break;
	239	case APCH_STATE_CSTATE_FAST:
	240	if (lbo_level)
	241	*val = POWER_SUPPLY_CAPACITY_LEVEL_HIGH;
	242	else
	243	*val = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
	244	break;
	245	case APCH_STATE_CSTATE_EOC:
	246	if (status & APCH_STATUS_CHGDAT)
	247	*val = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
	248	else
	249	*val = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
	250	break;
	251	case APCH_STATE_CSTATE_DISABLED:
	252	default:
	253	if (config & APCH_CFG_SUSCHG) {
	254	*val = POWER_SUPPLY_CAPACITY_LEVEL_UNKNOWN;
	255	} else {
	256	*val = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
	257	if (!(status & APCH_STATUS_INDAT)) {
	258	if (!lbo_level)
	259	*val = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
	260	}
	261	}
	262	break;
	263	}
	264
	265	return 0;
	266	}
	267
5c0e09e0 WY	268	static enum power_supply_property act8945a_charger_props[] = {
	269	POWER_SUPPLY_PROP_STATUS,
	270	POWER_SUPPLY_PROP_CHARGE_TYPE,
	271	POWER_SUPPLY_PROP_TECHNOLOGY,
	272	POWER_SUPPLY_PROP_HEALTH,
369eba09	273	POWER_SUPPLY_PROP_CAPACITY_LEVEL,
5c0e09e0 WY	274	POWER_SUPPLY_PROP_MODEL_NAME,
	275	POWER_SUPPLY_PROP_MANUFACTURER
	276	};
	277
	278	static int act8945a_charger_get_property(struct power_supply *psy,
	279	enum power_supply_property prop,
	280	union power_supply_propval *val)
	281	{
	282	struct act8945a_charger *charger = power_supply_get_drvdata(psy);
	283	struct regmap *regmap = charger->regmap;
	284	int ret = 0;
	285
	286	switch (prop) {
	287	case POWER_SUPPLY_PROP_STATUS:
	288	ret = act8945a_get_charger_state(regmap, &val->intval);
	289	break;
	290	case POWER_SUPPLY_PROP_CHARGE_TYPE:
	291	ret = act8945a_get_charge_type(regmap, &val->intval);
	292	break;
	293	case POWER_SUPPLY_PROP_TECHNOLOGY:
	294	val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
	295	break;
	296	case POWER_SUPPLY_PROP_HEALTH:
6b021fc9	297	ret = act8945a_get_battery_health(regmap, &val->intval);
5c0e09e0	298	break;
369eba09 WY	299	case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
	300	ret = act8945a_get_capacity_level(charger,
	301	regmap, &val->intval);
	302	break;
5c0e09e0 WY	303	case POWER_SUPPLY_PROP_MODEL_NAME:
	304	val->strval = act8945a_charger_model;
	305	break;
	306	case POWER_SUPPLY_PROP_MANUFACTURER:
	307	val->strval = act8945a_charger_manufacturer;
	308	break;
	309	default:
	310	return -EINVAL;
	311	}
	312
	313	return ret;
	314	}
	315
a09209ac WY	316	static int act8945a_enable_interrupt(struct act8945a_charger *charger)
	317	{
	318	struct regmap *regmap = charger->regmap;
	319	unsigned char ctrl;
	320	int ret;
	321
	322	ctrl = APCH_CTRL_CHGEOCOUT \| APCH_CTRL_CHGEOCIN \|
	323	APCH_CTRL_INDIS \| APCH_CTRL_INCON \|
	324	APCH_CTRL_TEMPOUT \| APCH_CTRL_TEMPIN \|
	325	APCH_CTRL_TIMRPRE \| APCH_CTRL_TIMRTOT;
	326	ret = regmap_write(regmap, ACT8945A_APCH_CTRL, ctrl);
	327	if (ret)
	328	return ret;
	329
	330	ctrl = APCH_STATUS_CHGSTAT \| APCH_STATUS_INSTAT \|
	331	APCH_STATUS_TEMPSTAT \| APCH_STATUS_TIMRSTAT;
	332	ret = regmap_write(regmap, ACT8945A_APCH_STATUS, ctrl);
	333	if (ret)
	334	return ret;
	335
	336	return 0;
	337	}
	338
10ca08b0 WY	339	static unsigned int act8945a_set_supply_type(struct act8945a_charger *charger,
	340	unsigned int *type)
	341	{
	342	unsigned int status, state;
	343	int ret;
	344
	345	ret = regmap_read(charger->regmap, ACT8945A_APCH_STATUS, &status);
	346	if (ret < 0)
	347	return ret;
	348
	349	ret = regmap_read(charger->regmap, ACT8945A_APCH_STATE, &state);
	350	if (ret < 0)
	351	return ret;
	352
	353	if (status & APCH_STATUS_INDAT) {
	354	if (state & APCH_STATE_ACINSTAT)
	355	*type = POWER_SUPPLY_TYPE_MAINS;
	356	else
	357	*type = POWER_SUPPLY_TYPE_USB;
	358	} else {
	359	*type = POWER_SUPPLY_TYPE_BATTERY;
	360	}
	361
	362	return 0;
	363	}
	364
a09209ac WY	365	static void act8945a_work(struct work_struct *work)
	366	{
	367	struct act8945a_charger *charger =
	368	container_of(work, struct act8945a_charger, work);
	369
10ca08b0 WY	370	act8945a_set_supply_type(charger, &charger->desc.type);
10ca08b0 WY	371
a09209ac WY	372	power_supply_changed(charger->psy);
	373	}
	374
	375	static irqreturn_t act8945a_status_changed(int irq, void *dev_id)
	376	{
	377	struct act8945a_charger *charger = dev_id;
	378
	379	if (charger->init_done)
	380	schedule_work(&charger->work);
	381
	382	return IRQ_HANDLED;
	383	}
	384
5c0e09e0 WY	385	#define DEFAULT_TOTAL_TIME_OUT 3
	386	#define DEFAULT_PRE_TIME_OUT 40
	387	#define DEFAULT_INPUT_OVP_THRESHOLD 6600
	388
	389	static int act8945a_charger_config(struct device *dev,
	390	struct act8945a_charger *charger)
	391	{
	392	struct device_node *np = dev->of_node;
	393	enum of_gpio_flags flags;
	394	struct regmap *regmap = charger->regmap;
	395
	396	u32 total_time_out;
	397	u32 pre_time_out;
	398	u32 input_voltage_threshold;
	399	int chglev_pin;
369eba09	400	int err, ret;
5c0e09e0	401
1f0ba406	402	unsigned int tmp;
5c0e09e0 WY	403	unsigned int value = 0;
	404
	405	if (!np) {
	406	dev_err(dev, "no charger of node\n");
	407	return -EINVAL;
	408	}
	409
1f0ba406 WY	410	ret = regmap_read(regmap, ACT8945A_APCH_CFG, &tmp);
	411	if (ret)
	412	return ret;
	413
	414	if (tmp & APCH_CFG_SUSCHG) {
	415	value \|= APCH_CFG_SUSCHG;
	416	dev_info(dev, "have been suspended\n");
	417	}
	418
369eba09 WY	419	charger->lbo_gpio = devm_gpiod_get_optional(dev, "active-semi,lbo",
	420	GPIOD_IN);
	421	if (IS_ERR(charger->lbo_gpio)) {
	422	err = PTR_ERR(charger->lbo_gpio);
	423	dev_err(dev, "unable to claim gpio \"lbo\": %d\n", err);
	424	return err;
	425	}
	426
	427	ret = devm_request_irq(dev, gpiod_to_irq(charger->lbo_gpio),
	428	act8945a_status_changed,
	429	(IRQF_TRIGGER_FALLING \| IRQF_TRIGGER_RISING),
	430	"act8945a_lbo_detect", charger);
	431	if (ret)
	432	dev_info(dev, "failed to request gpio \"lbo\" IRQ\n");
	433
5c0e09e0 WY	434	chglev_pin = of_get_named_gpio_flags(np,
	435	"active-semi,chglev-gpios", 0, &flags);
	436
	437	if (gpio_is_valid(chglev_pin)) {
	438	gpio_set_value(chglev_pin,
	439	((flags == OF_GPIO_ACTIVE_LOW) ? 0 : 1));
	440	}
	441
	442	if (of_property_read_u32(np,
	443	"active-semi,input-voltage-threshold-microvolt",
	444	&input_voltage_threshold))
	445	input_voltage_threshold = DEFAULT_INPUT_OVP_THRESHOLD;
	446
	447	if (of_property_read_u32(np,
	448	"active-semi,precondition-timeout",
	449	&pre_time_out))
	450	pre_time_out = DEFAULT_PRE_TIME_OUT;
	451
	452	if (of_property_read_u32(np, "active-semi,total-timeout",
	453	&total_time_out))
	454	total_time_out = DEFAULT_TOTAL_TIME_OUT;
	455
	456	switch (input_voltage_threshold) {
	457	case 8000:
	458	value \|= APCH_CFG_OVPSET_8V;
	459	break;
	460	case 7500:
	461	value \|= APCH_CFG_OVPSET_7V5;
	462	break;
	463	case 7000:
	464	value \|= APCH_CFG_OVPSET_7V;
	465	break;
	466	case 6600:
	467	default:
	468	value \|= APCH_CFG_OVPSET_6V6;
	469	break;
	470	}
	471
	472	switch (pre_time_out) {
	473	case 60:
	474	value \|= APCH_CFG_PRETIMO_60_MIN;
	475	break;
	476	case 80:
	477	value \|= APCH_CFG_PRETIMO_80_MIN;
	478	break;
	479	case 0:
	480	value \|= APCH_CFG_PRETIMO_DISABLED;
	481	break;
	482	case 40:
	483	default:
	484	value \|= APCH_CFG_PRETIMO_40_MIN;
	485	break;
	486	}
	487
	488	switch (total_time_out) {
	489	case 4:
	490	value \|= APCH_CFG_TOTTIMO_4_HOUR;
	491	break;
	492	case 5:
	493	value \|= APCH_CFG_TOTTIMO_5_HOUR;
	494	break;
	495	case 0:
	496	value \|= APCH_CFG_TOTTIMO_DISABLED;
	497	break;
498	case 3:
499	default:
500	value \|= APCH_CFG_TOTTIMO_3_HOUR;
501	break;
502	}
503
504	return regmap_write(regmap, ACT8945A_APCH_CFG, value);
505	}
506
507	static int act8945a_charger_probe(struct platform_device *pdev)
508	{
509	struct act8945a_charger *charger;
5c0e09e0	510	struct power_supply_config psy_cfg = {};
a09209ac	511	int irq, ret;
5c0e09e0 WY	512
	513	charger = devm_kzalloc(&pdev->dev, sizeof(*charger), GFP_KERNEL);
	514	if (!charger)
	515	return -ENOMEM;
	516
	517	charger->regmap = dev_get_regmap(pdev->dev.parent, NULL);
	518	if (!charger->regmap) {
	519	dev_err(&pdev->dev, "Parent did not provide regmap\n");
	520	return -EINVAL;
	521	}
	522
5da643b2	523	ret = act8945a_charger_config(&pdev->dev, charger);
5c0e09e0 WY	524	if (ret)
	525	return ret;
	526
a09209ac WY	527	irq = of_irq_get(pdev->dev.of_node, 0);
	528	if (irq == -EPROBE_DEFER) {
	529	dev_err(&pdev->dev, "failed to find IRQ number\n");
	530	return -EPROBE_DEFER;
	531	}
	532
	533	ret = devm_request_irq(&pdev->dev, irq, act8945a_status_changed,
	534	IRQF_TRIGGER_FALLING, "act8945a_interrupt",
	535	charger);
	536	if (ret) {
	537	dev_err(&pdev->dev, "failed to request nIRQ pin IRQ\n");
	538	return ret;
	539	}
	540
10ca08b0 WY	541	charger->desc.name = "act8945a-charger";
	542	charger->desc.get_property = act8945a_charger_get_property;
	543	charger->desc.properties = act8945a_charger_props;
	544	charger->desc.num_properties = ARRAY_SIZE(act8945a_charger_props);
	545
	546	ret = act8945a_set_supply_type(charger, &charger->desc.type);
	547	if (ret)
	548	return -EINVAL;
	549
5da643b2	550	psy_cfg.of_node = pdev->dev.of_node;
5c0e09e0 WY	551	psy_cfg.drv_data = charger;
5c0e09e0 WY	552
a09209ac	553	charger->psy = devm_power_supply_register(&pdev->dev,
10ca08b0	554	&charger->desc,
a09209ac WY	555	&psy_cfg);
a09209ac WY	556	if (IS_ERR(charger->psy)) {
5c0e09e0	557	dev_err(&pdev->dev, "failed to register power supply\n");
a09209ac	558	return PTR_ERR(charger->psy);
5c0e09e0 WY	559	}
5c0e09e0 WY	560
a09209ac WY	561	platform_set_drvdata(pdev, charger);
	562
	563	INIT_WORK(&charger->work, act8945a_work);
	564
	565	ret = act8945a_enable_interrupt(charger);
	566	if (ret)
	567	return -EIO;
	568
	569	charger->init_done = true;
	570
	571	return 0;
	572	}
	573
	574	static int act8945a_charger_remove(struct platform_device *pdev)
	575	{
	576	struct act8945a_charger *charger = platform_get_drvdata(pdev);
	577
	578	charger->init_done = false;
	579	cancel_work_sync(&charger->work);
	580
5c0e09e0 WY	581	return 0;
	582	}
	583
	584	static struct platform_driver act8945a_charger_driver = {
	585	.driver = {
	586	.name = "act8945a-charger",
	587	},
	588	.probe = act8945a_charger_probe,
a09209ac	589	.remove = act8945a_charger_remove,
5c0e09e0 WY	590	};
	591	module_platform_driver(act8945a_charger_driver);
	592
	593	MODULE_DESCRIPTION("Active-semi ACT8945A ActivePath charger driver");
	594	MODULE_AUTHOR("Wenyou Yang <wenyou.yang@atmel.com>");
	595	MODULE_LICENSE("GPL");