[deliverable/linux.git] / drivers / power / max8925_power.c

/*
 * Battery driver for Maxim MAX8925
 *
 * Copyright (c) 2009-2010 Marvell International Ltd.
 *	Haojian Zhuang <haojian.zhuang@marvell.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/module.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/mfd/max8925.h>

/* registers in GPM */
#define MAX8925_OUT5VEN			0x54
#define MAX8925_OUT3VEN			0x58
#define MAX8925_CHG_CNTL1		0x7c

/* bits definition */
#define MAX8925_CHG_STAT_VSYSLOW	(1 << 0)
#define MAX8925_CHG_STAT_MODE_MASK	(3 << 2)
#define MAX8925_CHG_STAT_EN_MASK	(1 << 4)
#define MAX8925_CHG_MBDET		(1 << 1)
#define MAX8925_CHG_AC_RANGE_MASK	(3 << 6)

/* registers in ADC */
#define MAX8925_ADC_RES_CNFG1		0x06
#define MAX8925_ADC_AVG_CNFG1		0x07
#define MAX8925_ADC_ACQ_CNFG1		0x08
#define MAX8925_ADC_ACQ_CNFG2		0x09
/* 2 bytes registers in below. MSB is 1st, LSB is 2nd. */
#define MAX8925_ADC_AUX2		0x62
#define MAX8925_ADC_VCHG		0x64
#define MAX8925_ADC_VBBATT		0x66
#define MAX8925_ADC_VMBATT		0x68
#define MAX8925_ADC_ISNS		0x6a
#define MAX8925_ADC_THM			0x6c
#define MAX8925_ADC_TDIE		0x6e
#define MAX8925_CMD_AUX2		0xc8
#define MAX8925_CMD_VCHG		0xd0
#define MAX8925_CMD_VBBATT		0xd8
#define MAX8925_CMD_VMBATT		0xe0
#define MAX8925_CMD_ISNS		0xe8
#define MAX8925_CMD_THM			0xf0
#define MAX8925_CMD_TDIE		0xf8

enum {
	MEASURE_AUX2,
	MEASURE_VCHG,
	MEASURE_VBBATT,
	MEASURE_VMBATT,
	MEASURE_ISNS,
	MEASURE_THM,
	MEASURE_TDIE,
	MEASURE_MAX,
};

struct max8925_power_info {
	struct max8925_chip	*chip;
	struct i2c_client	*gpm;
	struct i2c_client	*adc;

	struct power_supply	ac;
	struct power_supply	usb;
	struct power_supply	battery;
	int			irq_base;
	unsigned		ac_online:1;
	unsigned		usb_online:1;
	unsigned		bat_online:1;
	unsigned		chg_mode:2;
	unsigned		batt_detect:1;	/* detecing MB by ID pin */
	unsigned		topoff_threshold:2;
	unsigned		fast_charge:3;
	unsigned		no_temp_support:1;
	unsigned		no_insert_detect:1;

	int (*set_charger) (int);
};

static int __set_charger(struct max8925_power_info *info, int enable)
{
	struct max8925_chip *chip = info->chip;
	if (enable) {
		/* enable charger in platform */
		if (info->set_charger)
			info->set_charger(1);
		/* enable charger */
		max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 1 << 7, 0);
	} else {
		/* disable charge */
		max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 1 << 7, 1 << 7);
		if (info->set_charger)
			info->set_charger(0);
	}
	dev_dbg(chip->dev, "%s\n", (enable) ? "Enable charger"
		: "Disable charger");
	return 0;
}

static irqreturn_t max8925_charger_handler(int irq, void *data)
{
	struct max8925_power_info *info = (struct max8925_power_info *)data;
	struct max8925_chip *chip = info->chip;

	switch (irq - chip->irq_base) {
	case MAX8925_IRQ_VCHG_DC_R:
		info->ac_online = 1;
		__set_charger(info, 1);
		dev_dbg(chip->dev, "Adapter inserted\n");
		break;
	case MAX8925_IRQ_VCHG_DC_F:
		info->ac_online = 0;
		__set_charger(info, 0);
		dev_dbg(chip->dev, "Adapter removed\n");
		break;
	case MAX8925_IRQ_VCHG_THM_OK_F:
		/* Battery is not ready yet */
		dev_dbg(chip->dev, "Battery temperature is out of range\n");
	case MAX8925_IRQ_VCHG_DC_OVP:
		dev_dbg(chip->dev, "Error detection\n");
		__set_charger(info, 0);
		break;
	case MAX8925_IRQ_VCHG_THM_OK_R:
		/* Battery is ready now */
		dev_dbg(chip->dev, "Battery temperature is in range\n");
		break;
	case MAX8925_IRQ_VCHG_SYSLOW_R:
		/* VSYS is low */
		dev_info(chip->dev, "Sys power is too low\n");
		break;
	case MAX8925_IRQ_VCHG_SYSLOW_F:
		dev_dbg(chip->dev, "Sys power is above low threshold\n");
		break;
	case MAX8925_IRQ_VCHG_DONE:
		__set_charger(info, 0);
		dev_dbg(chip->dev, "Charging is done\n");
		break;
	case MAX8925_IRQ_VCHG_TOPOFF:
		dev_dbg(chip->dev, "Charging in top-off mode\n");
		break;
	case MAX8925_IRQ_VCHG_TMR_FAULT:
		__set_charger(info, 0);
		dev_dbg(chip->dev, "Safe timer is expired\n");
		break;
	case MAX8925_IRQ_VCHG_RST:
		__set_charger(info, 0);
		dev_dbg(chip->dev, "Charger is reset\n");
		break;
	}
	return IRQ_HANDLED;
}

static int start_measure(struct max8925_power_info *info, int type)
{
	unsigned char buf[2] = {0, 0};
	int meas_cmd;
	int meas_reg = 0, ret;

	switch (type) {
	case MEASURE_VCHG:
		meas_cmd = MAX8925_CMD_VCHG;
		meas_reg = MAX8925_ADC_VCHG;
		break;
	case MEASURE_VBBATT:
		meas_cmd = MAX8925_CMD_VBBATT;
		meas_reg = MAX8925_ADC_VBBATT;
		break;
	case MEASURE_VMBATT:
		meas_cmd = MAX8925_CMD_VMBATT;
		meas_reg = MAX8925_ADC_VMBATT;
		break;
	case MEASURE_ISNS:
		meas_cmd = MAX8925_CMD_ISNS;
		meas_reg = MAX8925_ADC_ISNS;
		break;
	default:
		return -EINVAL;
	}

	max8925_reg_write(info->adc, meas_cmd, 0);
	max8925_bulk_read(info->adc, meas_reg, 2, buf);
	ret = ((buf[0]<<8) | buf[1]) >> 4;

	return ret;
}

static int max8925_ac_get_prop(struct power_supply *psy,
			       enum power_supply_property psp,
			       union power_supply_propval *val)
{
	struct max8925_power_info *info = dev_get_drvdata(psy->dev->parent);
	int ret = 0;

	switch (psp) {
	case POWER_SUPPLY_PROP_ONLINE:
		val->intval = info->ac_online;
		break;
	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
		if (info->ac_online) {
			ret = start_measure(info, MEASURE_VCHG);
			if (ret >= 0) {
				val->intval = ret * 2000;	/* unit is uV */
				goto out;
			}
		}
		ret = -ENODATA;
		break;
	default:
		ret = -ENODEV;
		break;
	}
out:
	return ret;
}

static enum power_supply_property max8925_ac_props[] = {
	POWER_SUPPLY_PROP_ONLINE,
	POWER_SUPPLY_PROP_VOLTAGE_NOW,
};

static int max8925_usb_get_prop(struct power_supply *psy,
				enum power_supply_property psp,
				union power_supply_propval *val)
{
	struct max8925_power_info *info = dev_get_drvdata(psy->dev->parent);
	int ret = 0;

	switch (psp) {
	case POWER_SUPPLY_PROP_ONLINE:
		val->intval = info->usb_online;
		break;
	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
		if (info->usb_online) {
			ret = start_measure(info, MEASURE_VCHG);
			if (ret >= 0) {
				val->intval = ret * 2000;	/* unit is uV */
				goto out;
			}
		}
		ret = -ENODATA;
		break;
	default:
		ret = -ENODEV;
		break;
	}
out:
	return ret;
}

static enum power_supply_property max8925_usb_props[] = {
	POWER_SUPPLY_PROP_ONLINE,
	POWER_SUPPLY_PROP_VOLTAGE_NOW,
};

static int max8925_bat_get_prop(struct power_supply *psy,
				enum power_supply_property psp,
				union power_supply_propval *val)
{
	struct max8925_power_info *info = dev_get_drvdata(psy->dev->parent);
	int ret = 0;

	switch (psp) {
	case POWER_SUPPLY_PROP_ONLINE:
		val->intval = info->bat_online;
		break;
	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
		if (info->bat_online) {
			ret = start_measure(info, MEASURE_VMBATT);
			if (ret >= 0) {
				val->intval = ret * 2000;	/* unit is uV */
				ret = 0;
				break;
			}
		}
		ret = -ENODATA;
		break;
	case POWER_SUPPLY_PROP_CURRENT_NOW:
		if (info->bat_online) {
			ret = start_measure(info, MEASURE_ISNS);
			if (ret >= 0) {
				/* assume r_sns is 0.02 */
				ret = ((ret * 6250) - 3125) /* uA */;
				val->intval = 0;
				if (ret > 0)
					val->intval = ret; /* unit is mA */
				ret = 0;
				break;
			}
		}
		ret = -ENODATA;
		break;
	case POWER_SUPPLY_PROP_CHARGE_TYPE:
		if (!info->bat_online) {
			ret = -ENODATA;
			break;
		}
		ret = max8925_reg_read(info->gpm, MAX8925_CHG_STATUS);
		ret = (ret & MAX8925_CHG_STAT_MODE_MASK) >> 2;
		switch (ret) {
		case 1:
			val->intval = POWER_SUPPLY_CHARGE_TYPE_FAST;
			break;
		case 0:
		case 2:
			val->intval = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
			break;
		case 3:
			val->intval = POWER_SUPPLY_CHARGE_TYPE_NONE;
			break;
		}
		ret = 0;
		break;
	case POWER_SUPPLY_PROP_STATUS:
		if (!info->bat_online) {
			ret = -ENODATA;
			break;
		}
		ret = max8925_reg_read(info->gpm, MAX8925_CHG_STATUS);
		if (info->usb_online || info->ac_online) {
			val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
			if (ret & MAX8925_CHG_STAT_EN_MASK)
				val->intval = POWER_SUPPLY_STATUS_CHARGING;
		} else
			val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
		ret = 0;
		break;
	default:
		ret = -ENODEV;
		break;
	}
	return ret;
}

static enum power_supply_property max8925_battery_props[] = {
	POWER_SUPPLY_PROP_ONLINE,
	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	POWER_SUPPLY_PROP_CURRENT_NOW,
	POWER_SUPPLY_PROP_CHARGE_TYPE,
	POWER_SUPPLY_PROP_STATUS,
};

#define REQUEST_IRQ(_irq, _name)					\
do {									\
	ret = request_threaded_irq(chip->irq_base + _irq, NULL,		\
				    max8925_charger_handler,		\
				    IRQF_ONESHOT, _name, info);		\
	if (ret)							\
		dev_err(chip->dev, "Failed to request IRQ #%d: %d\n",	\
			_irq, ret);					\
} while (0)

static int max8925_init_charger(struct max8925_chip *chip,
					  struct max8925_power_info *info)
{
	int ret;

	REQUEST_IRQ(MAX8925_IRQ_VCHG_DC_OVP, "ac-ovp");
	if (!info->no_insert_detect) {
		REQUEST_IRQ(MAX8925_IRQ_VCHG_DC_F, "ac-remove");
		REQUEST_IRQ(MAX8925_IRQ_VCHG_DC_R, "ac-insert");
	}
	if (!info->no_temp_support) {
		REQUEST_IRQ(MAX8925_IRQ_VCHG_THM_OK_R, "batt-temp-in-range");
		REQUEST_IRQ(MAX8925_IRQ_VCHG_THM_OK_F, "batt-temp-out-range");
	}
	REQUEST_IRQ(MAX8925_IRQ_VCHG_SYSLOW_F, "vsys-high");
	REQUEST_IRQ(MAX8925_IRQ_VCHG_SYSLOW_R, "vsys-low");
	REQUEST_IRQ(MAX8925_IRQ_VCHG_RST, "charger-reset");
	REQUEST_IRQ(MAX8925_IRQ_VCHG_DONE, "charger-done");
	REQUEST_IRQ(MAX8925_IRQ_VCHG_TOPOFF, "charger-topoff");
	REQUEST_IRQ(MAX8925_IRQ_VCHG_TMR_FAULT, "charger-timer-expire");

	info->usb_online = 0;
	info->bat_online = 0;

	/* check for power - can miss interrupt at boot time */
	if (start_measure(info, MEASURE_VCHG) * 2000 > 500000)
		info->ac_online = 1;
	else
		info->ac_online = 0;

	ret = max8925_reg_read(info->gpm, MAX8925_CHG_STATUS);
	if (ret >= 0) {
		/*
		 * If battery detection is enabled, ID pin of battery is
		 * connected to MBDET pin of MAX8925. It could be used to
		 * detect battery presence.
		 * Otherwise, we have to assume that battery is always on.
		 */
		if (info->batt_detect)
			info->bat_online = (ret & MAX8925_CHG_MBDET) ? 0 : 1;
		else
			info->bat_online = 1;
		if (ret & MAX8925_CHG_AC_RANGE_MASK)
			info->ac_online = 1;
		else
			info->ac_online = 0;
	}
	/* disable charge */
	max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 1 << 7, 1 << 7);
	/* set charging current in charge topoff mode */
	max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 3 << 5,
			 info->topoff_threshold << 5);
	/* set charing current in fast charge mode */
	max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 7, info->fast_charge);

	return 0;
}

static int max8925_deinit_charger(struct max8925_power_info *info)
{
	struct max8925_chip *chip = info->chip;
	int irq;

	irq = chip->irq_base + MAX8925_IRQ_VCHG_DC_OVP;
	for (; irq <= chip->irq_base + MAX8925_IRQ_VCHG_TMR_FAULT; irq++)
		free_irq(irq, info);

	return 0;
}

static int max8925_power_probe(struct platform_device *pdev)
{
	struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
	struct max8925_power_pdata *pdata = NULL;
	struct max8925_power_info *info;
	int ret;

	pdata = pdev->dev.platform_data;
	if (!pdata) {
		dev_err(&pdev->dev, "platform data isn't assigned to "
			"power supply\n");
		return -EINVAL;
	}

	info = kzalloc(sizeof(struct max8925_power_info), GFP_KERNEL);
	if (!info)
		return -ENOMEM;
	info->chip = chip;
	info->gpm = chip->i2c;
	info->adc = chip->adc;
	platform_set_drvdata(pdev, info);

	info->ac.name = "max8925-ac";
	info->ac.type = POWER_SUPPLY_TYPE_MAINS;
	info->ac.properties = max8925_ac_props;
	info->ac.num_properties = ARRAY_SIZE(max8925_ac_props);
	info->ac.get_property = max8925_ac_get_prop;
	info->ac.supplied_to = pdata->supplied_to;
	info->ac.num_supplicants = pdata->num_supplicants;
	ret = power_supply_register(&pdev->dev, &info->ac);
	if (ret)
		goto out;
	info->ac.dev->parent = &pdev->dev;

	info->usb.name = "max8925-usb";
	info->usb.type = POWER_SUPPLY_TYPE_USB;
	info->usb.properties = max8925_usb_props;
	info->usb.num_properties = ARRAY_SIZE(max8925_usb_props);
	info->usb.get_property = max8925_usb_get_prop;
	info->usb.supplied_to = pdata->supplied_to;
	info->usb.num_supplicants = pdata->num_supplicants;

	ret = power_supply_register(&pdev->dev, &info->usb);
	if (ret)
		goto out_usb;
	info->usb.dev->parent = &pdev->dev;

	info->battery.name = "max8925-battery";
	info->battery.type = POWER_SUPPLY_TYPE_BATTERY;
	info->battery.properties = max8925_battery_props;
	info->battery.num_properties = ARRAY_SIZE(max8925_battery_props);
	info->battery.get_property = max8925_bat_get_prop;
	ret = power_supply_register(&pdev->dev, &info->battery);
	if (ret)
		goto out_battery;
	info->battery.dev->parent = &pdev->dev;

	info->batt_detect = pdata->batt_detect;
	info->topoff_threshold = pdata->topoff_threshold;
	info->fast_charge = pdata->fast_charge;
	info->set_charger = pdata->set_charger;
	info->no_temp_support = pdata->no_temp_support;
	info->no_insert_detect = pdata->no_insert_detect;

	max8925_init_charger(chip, info);
	return 0;
out_battery:
	power_supply_unregister(&info->battery);
out_usb:
	power_supply_unregister(&info->ac);
out:
	kfree(info);
	return ret;
}

static int max8925_power_remove(struct platform_device *pdev)
{
	struct max8925_power_info *info = platform_get_drvdata(pdev);

	if (info) {
		power_supply_unregister(&info->ac);
		power_supply_unregister(&info->usb);
		power_supply_unregister(&info->battery);
		max8925_deinit_charger(info);
		kfree(info);
	}
	return 0;
}

static struct platform_driver max8925_power_driver = {
	.probe	= max8925_power_probe,
	.remove	= max8925_power_remove,
	.driver	= {
		.name	= "max8925-power",
	},
};

module_platform_driver(max8925_power_driver);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Power supply driver for MAX8925");
MODULE_ALIAS("platform:max8925-power");
Commit	Line	Data
28db3888 HZ	1	/*
	2	* Battery driver for Maxim MAX8925
	3	*
	4	* Copyright (c) 2009-2010 Marvell International Ltd.
	5	* Haojian Zhuang <haojian.zhuang@marvell.com>
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*/
	11
	12	#include <linux/module.h>
	13	#include <linux/err.h>
5a0e3ad6	14	#include <linux/slab.h>
28db3888 HZ	15	#include <linux/i2c.h>
	16	#include <linux/interrupt.h>
	17	#include <linux/platform_device.h>
	18	#include <linux/power_supply.h>
	19	#include <linux/mfd/max8925.h>
	20
	21	/* registers in GPM */
	22	#define MAX8925_OUT5VEN 0x54
	23	#define MAX8925_OUT3VEN 0x58
	24	#define MAX8925_CHG_CNTL1 0x7c
	25
	26	/* bits definition */
	27	#define MAX8925_CHG_STAT_VSYSLOW (1 << 0)
	28	#define MAX8925_CHG_STAT_MODE_MASK (3 << 2)
	29	#define MAX8925_CHG_STAT_EN_MASK (1 << 4)
	30	#define MAX8925_CHG_MBDET (1 << 1)
	31	#define MAX8925_CHG_AC_RANGE_MASK (3 << 6)
	32
	33	/* registers in ADC */
	34	#define MAX8925_ADC_RES_CNFG1 0x06
	35	#define MAX8925_ADC_AVG_CNFG1 0x07
	36	#define MAX8925_ADC_ACQ_CNFG1 0x08
	37	#define MAX8925_ADC_ACQ_CNFG2 0x09
	38	/* 2 bytes registers in below. MSB is 1st, LSB is 2nd. */
	39	#define MAX8925_ADC_AUX2 0x62
	40	#define MAX8925_ADC_VCHG 0x64
	41	#define MAX8925_ADC_VBBATT 0x66
	42	#define MAX8925_ADC_VMBATT 0x68
	43	#define MAX8925_ADC_ISNS 0x6a
	44	#define MAX8925_ADC_THM 0x6c
	45	#define MAX8925_ADC_TDIE 0x6e
	46	#define MAX8925_CMD_AUX2 0xc8
	47	#define MAX8925_CMD_VCHG 0xd0
	48	#define MAX8925_CMD_VBBATT 0xd8
	49	#define MAX8925_CMD_VMBATT 0xe0
	50	#define MAX8925_CMD_ISNS 0xe8
	51	#define MAX8925_CMD_THM 0xf0
	52	#define MAX8925_CMD_TDIE 0xf8
	53
	54	enum {
	55	MEASURE_AUX2,
	56	MEASURE_VCHG,
	57	MEASURE_VBBATT,
	58	MEASURE_VMBATT,
	59	MEASURE_ISNS,
	60	MEASURE_THM,
	61	MEASURE_TDIE,
	62	MEASURE_MAX,
	63	};
	64
	65	struct max8925_power_info {
	66	struct max8925_chip *chip;
	67	struct i2c_client *gpm;
	68	struct i2c_client *adc;
	69
	70	struct power_supply ac;
	71	struct power_supply usb;
	72	struct power_supply battery;
	73	int irq_base;
	74	unsigned ac_online:1;
	75	unsigned usb_online:1;
	76	unsigned bat_online:1;
	77	unsigned chg_mode:2;
	78	unsigned batt_detect:1; /* detecing MB by ID pin */
79	unsigned topoff_threshold:2;
80	unsigned fast_charge:3;
92de378b	81	unsigned no_temp_support:1;
5ba1fa0a	82	unsigned no_insert_detect:1;
28db3888 HZ	83
	84	int (*set_charger) (int);
	85	};
	86
	87	static int __set_charger(struct max8925_power_info *info, int enable)
	88	{
	89	struct max8925_chip *chip = info->chip;
	90	if (enable) {
	91	/* enable charger in platform */
	92	if (info->set_charger)
	93	info->set_charger(1);
	94	/* enable charger */
	95	max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 1 << 7, 0);
	96	} else {
	97	/* disable charge */
	98	max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 1 << 7, 1 << 7);
	99	if (info->set_charger)
	100	info->set_charger(0);
	101	}
	102	dev_dbg(chip->dev, "%s\n", (enable) ? "Enable charger"
	103	: "Disable charger");
	104	return 0;
	105	}
	106
	107	static irqreturn_t max8925_charger_handler(int irq, void *data)
	108	{
	109	struct max8925_power_info info = (struct max8925_power_info )data;
	110	struct max8925_chip *chip = info->chip;
	111
	112	switch (irq - chip->irq_base) {
	113	case MAX8925_IRQ_VCHG_DC_R:
	114	info->ac_online = 1;
	115	__set_charger(info, 1);
	116	dev_dbg(chip->dev, "Adapter inserted\n");
	117	break;
	118	case MAX8925_IRQ_VCHG_DC_F:
	119	info->ac_online = 0;
	120	__set_charger(info, 0);
92de378b	121	dev_dbg(chip->dev, "Adapter removed\n");
28db3888	122	break;
28db3888 HZ	123	case MAX8925_IRQ_VCHG_THM_OK_F:
	124	/* Battery is not ready yet */
	125	dev_dbg(chip->dev, "Battery temperature is out of range\n");
	126	case MAX8925_IRQ_VCHG_DC_OVP:
	127	dev_dbg(chip->dev, "Error detection\n");
	128	__set_charger(info, 0);
	129	break;
	130	case MAX8925_IRQ_VCHG_THM_OK_R:
	131	/* Battery is ready now */
	132	dev_dbg(chip->dev, "Battery temperature is in range\n");
	133	break;
	134	case MAX8925_IRQ_VCHG_SYSLOW_R:
	135	/* VSYS is low */
	136	dev_info(chip->dev, "Sys power is too low\n");
	137	break;
	138	case MAX8925_IRQ_VCHG_SYSLOW_F:
	139	dev_dbg(chip->dev, "Sys power is above low threshold\n");
	140	break;
	141	case MAX8925_IRQ_VCHG_DONE:
	142	__set_charger(info, 0);
	143	dev_dbg(chip->dev, "Charging is done\n");
	144	break;
	145	case MAX8925_IRQ_VCHG_TOPOFF:
	146	dev_dbg(chip->dev, "Charging in top-off mode\n");
	147	break;
	148	case MAX8925_IRQ_VCHG_TMR_FAULT:
	149	__set_charger(info, 0);
	150	dev_dbg(chip->dev, "Safe timer is expired\n");
	151	break;
	152	case MAX8925_IRQ_VCHG_RST:
	153	__set_charger(info, 0);
	154	dev_dbg(chip->dev, "Charger is reset\n");
	155	break;
	156	}
	157	return IRQ_HANDLED;
	158	}
	159
	160	static int start_measure(struct max8925_power_info *info, int type)
	161	{
	162	unsigned char buf[2] = {0, 0};
b57f2f61	163	int meas_cmd;
28db3888 HZ	164	int meas_reg = 0, ret;
	165
	166	switch (type) {
	167	case MEASURE_VCHG:
b57f2f61	168	meas_cmd = MAX8925_CMD_VCHG;
28db3888 HZ	169	meas_reg = MAX8925_ADC_VCHG;
	170	break;
	171	case MEASURE_VBBATT:
b57f2f61	172	meas_cmd = MAX8925_CMD_VBBATT;
28db3888 HZ	173	meas_reg = MAX8925_ADC_VBBATT;
	174	break;
	175	case MEASURE_VMBATT:
b57f2f61	176	meas_cmd = MAX8925_CMD_VMBATT;
28db3888 HZ	177	meas_reg = MAX8925_ADC_VMBATT;
	178	break;
	179	case MEASURE_ISNS:
b57f2f61	180	meas_cmd = MAX8925_CMD_ISNS;
28db3888 HZ	181	meas_reg = MAX8925_ADC_ISNS;
	182	break;
	183	default:
	184	return -EINVAL;
	185	}
	186
b57f2f61	187	max8925_reg_write(info->adc, meas_cmd, 0);
28db3888	188	max8925_bulk_read(info->adc, meas_reg, 2, buf);
9c9cf9e2	189	ret = ((buf[0]<<8) \| buf[1]) >> 4;
28db3888 HZ	190
	191	return ret;
	192	}
	193
	194	static int max8925_ac_get_prop(struct power_supply *psy,
	195	enum power_supply_property psp,
	196	union power_supply_propval *val)
	197	{
	198	struct max8925_power_info *info = dev_get_drvdata(psy->dev->parent);
	199	int ret = 0;
	200
	201	switch (psp) {
	202	case POWER_SUPPLY_PROP_ONLINE:
	203	val->intval = info->ac_online;
	204	break;
	205	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
	206	if (info->ac_online) {
	207	ret = start_measure(info, MEASURE_VCHG);
	208	if (ret >= 0) {
9c9cf9e2	209	val->intval = ret * 2000; /* unit is uV */
28db3888 HZ	210	goto out;
	211	}
	212	}
	213	ret = -ENODATA;
	214	break;
	215	default:
	216	ret = -ENODEV;
	217	break;
	218	}
	219	out:
	220	return ret;
	221	}
	222
	223	static enum power_supply_property max8925_ac_props[] = {
	224	POWER_SUPPLY_PROP_ONLINE,
	225	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	226	};
	227
	228	static int max8925_usb_get_prop(struct power_supply *psy,
	229	enum power_supply_property psp,
	230	union power_supply_propval *val)
	231	{
	232	struct max8925_power_info *info = dev_get_drvdata(psy->dev->parent);
	233	int ret = 0;
	234
	235	switch (psp) {
	236	case POWER_SUPPLY_PROP_ONLINE:
	237	val->intval = info->usb_online;
	238	break;
	239	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
	240	if (info->usb_online) {
	241	ret = start_measure(info, MEASURE_VCHG);
	242	if (ret >= 0) {
9c9cf9e2	243	val->intval = ret * 2000; /* unit is uV */
28db3888 HZ	244	goto out;
	245	}
	246	}
	247	ret = -ENODATA;
	248	break;
	249	default:
	250	ret = -ENODEV;
	251	break;
	252	}
	253	out:
	254	return ret;
	255	}
	256
	257	static enum power_supply_property max8925_usb_props[] = {
	258	POWER_SUPPLY_PROP_ONLINE,
	259	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	260	};
	261
	262	static int max8925_bat_get_prop(struct power_supply *psy,
	263	enum power_supply_property psp,
	264	union power_supply_propval *val)
	265	{
	266	struct max8925_power_info *info = dev_get_drvdata(psy->dev->parent);
28db3888 HZ	267	int ret = 0;
	268
	269	switch (psp) {
	270	case POWER_SUPPLY_PROP_ONLINE:
	271	val->intval = info->bat_online;
	272	break;
	273	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
	274	if (info->bat_online) {
	275	ret = start_measure(info, MEASURE_VMBATT);
	276	if (ret >= 0) {
9c9cf9e2	277	val->intval = ret * 2000; /* unit is uV */
28db3888 HZ	278	ret = 0;
	279	break;
	280	}
	281	}
	282	ret = -ENODATA;
	283	break;
	284	case POWER_SUPPLY_PROP_CURRENT_NOW:
	285	if (info->bat_online) {
	286	ret = start_measure(info, MEASURE_ISNS);
	287	if (ret >= 0) {
9c9cf9e2 PR	288	/* assume r_sns is 0.02 */
9c9cf9e2 PR	289	ret = ((ret * 6250) - 3125) /* uA */;
28db3888 HZ	290	val->intval = 0;
	291	if (ret > 0)
	292	val->intval = ret; /* unit is mA */
	293	ret = 0;
	294	break;
	295	}
	296	}
	297	ret = -ENODATA;
	298	break;
	299	case POWER_SUPPLY_PROP_CHARGE_TYPE:
	300	if (!info->bat_online) {
	301	ret = -ENODATA;
	302	break;
	303	}
	304	ret = max8925_reg_read(info->gpm, MAX8925_CHG_STATUS);
	305	ret = (ret & MAX8925_CHG_STAT_MODE_MASK) >> 2;
	306	switch (ret) {
	307	case 1:
	308	val->intval = POWER_SUPPLY_CHARGE_TYPE_FAST;
	309	break;
	310	case 0:
	311	case 2:
	312	val->intval = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
	313	break;
	314	case 3:
	315	val->intval = POWER_SUPPLY_CHARGE_TYPE_NONE;
	316	break;
	317	}
	318	ret = 0;
	319	break;
	320	case POWER_SUPPLY_PROP_STATUS:
	321	if (!info->bat_online) {
	322	ret = -ENODATA;
	323	break;
	324	}
	325	ret = max8925_reg_read(info->gpm, MAX8925_CHG_STATUS);
	326	if (info->usb_online \|\| info->ac_online) {
	327	val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
	328	if (ret & MAX8925_CHG_STAT_EN_MASK)
	329	val->intval = POWER_SUPPLY_STATUS_CHARGING;
	330	} else
	331	val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
	332	ret = 0;
	333	break;
	334	default:
	335	ret = -ENODEV;
	336	break;
	337	}
	338	return ret;
	339	}
	340
	341	static enum power_supply_property max8925_battery_props[] = {
	342	POWER_SUPPLY_PROP_ONLINE,
	343	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	344	POWER_SUPPLY_PROP_CURRENT_NOW,
	345	POWER_SUPPLY_PROP_CHARGE_TYPE,
	346	POWER_SUPPLY_PROP_STATUS,
	347	};
	348
	349	#define REQUEST_IRQ(_irq, _name) \
	350	do { \
	351	ret = request_threaded_irq(chip->irq_base + _irq, NULL, \
	352	max8925_charger_handler, \
	353	IRQF_ONESHOT, _name, info); \
354	if (ret) \
355	dev_err(chip->dev, "Failed to request IRQ #%d: %d\n", \
356	_irq, ret); \
357	} while (0)
358
c8afa640	359	static int max8925_init_charger(struct max8925_chip *chip,
28db3888 HZ	360	struct max8925_power_info *info)
	361	{
	362	int ret;
	363
	364	REQUEST_IRQ(MAX8925_IRQ_VCHG_DC_OVP, "ac-ovp");
5ba1fa0a PR	365	if (!info->no_insert_detect) {
	366	REQUEST_IRQ(MAX8925_IRQ_VCHG_DC_F, "ac-remove");
	367	REQUEST_IRQ(MAX8925_IRQ_VCHG_DC_R, "ac-insert");
	368	}
92de378b PR	369	if (!info->no_temp_support) {
	370	REQUEST_IRQ(MAX8925_IRQ_VCHG_THM_OK_R, "batt-temp-in-range");
	371	REQUEST_IRQ(MAX8925_IRQ_VCHG_THM_OK_F, "batt-temp-out-range");
	372	}
28db3888 HZ	373	REQUEST_IRQ(MAX8925_IRQ_VCHG_SYSLOW_F, "vsys-high");
	374	REQUEST_IRQ(MAX8925_IRQ_VCHG_SYSLOW_R, "vsys-low");
	375	REQUEST_IRQ(MAX8925_IRQ_VCHG_RST, "charger-reset");
	376	REQUEST_IRQ(MAX8925_IRQ_VCHG_DONE, "charger-done");
	377	REQUEST_IRQ(MAX8925_IRQ_VCHG_TOPOFF, "charger-topoff");
	378	REQUEST_IRQ(MAX8925_IRQ_VCHG_TMR_FAULT, "charger-timer-expire");
	379
28db3888 HZ	380	info->usb_online = 0;
28db3888 HZ	381	info->bat_online = 0;
00a159a5 PR	382
	383	/* check for power - can miss interrupt at boot time */
	384	if (start_measure(info, MEASURE_VCHG) * 2000 > 500000)
	385	info->ac_online = 1;
	386	else
	387	info->ac_online = 0;
	388
28db3888 HZ	389	ret = max8925_reg_read(info->gpm, MAX8925_CHG_STATUS);
	390	if (ret >= 0) {
	391	/*
	392	* If battery detection is enabled, ID pin of battery is
	393	* connected to MBDET pin of MAX8925. It could be used to
	394	* detect battery presence.
	395	* Otherwise, we have to assume that battery is always on.
	396	*/
	397	if (info->batt_detect)
	398	info->bat_online = (ret & MAX8925_CHG_MBDET) ? 0 : 1;
	399	else
	400	info->bat_online = 1;
	401	if (ret & MAX8925_CHG_AC_RANGE_MASK)
	402	info->ac_online = 1;
	403	else
	404	info->ac_online = 0;
	405	}
	406	/* disable charge */
	407	max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 1 << 7, 1 << 7);
	408	/* set charging current in charge topoff mode */
	409	max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 3 << 5,
	410	info->topoff_threshold << 5);
	411	/* set charing current in fast charge mode */
	412	max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 7, info->fast_charge);
	413
	414	return 0;
	415	}
	416
415ec69f	417	static int max8925_deinit_charger(struct max8925_power_info *info)
28db3888 HZ	418	{
	419	struct max8925_chip *chip = info->chip;
	420	int irq;
	421
	422	irq = chip->irq_base + MAX8925_IRQ_VCHG_DC_OVP;
	423	for (; irq <= chip->irq_base + MAX8925_IRQ_VCHG_TMR_FAULT; irq++)
	424	free_irq(irq, info);
	425
	426	return 0;
	427	}
	428
c8afa640	429	static int max8925_power_probe(struct platform_device *pdev)
28db3888 HZ	430	{
28db3888 HZ	431	struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
28db3888 HZ	432	struct max8925_power_pdata *pdata = NULL;
	433	struct max8925_power_info *info;
	434	int ret;
	435
2402ca5e	436	pdata = pdev->dev.platform_data;
28db3888 HZ	437	if (!pdata) {
	438	dev_err(&pdev->dev, "platform data isn't assigned to "
	439	"power supply\n");
	440	return -EINVAL;
	441	}
	442
	443	info = kzalloc(sizeof(struct max8925_power_info), GFP_KERNEL);
	444	if (!info)
	445	return -ENOMEM;
	446	info->chip = chip;
	447	info->gpm = chip->i2c;
	448	info->adc = chip->adc;
2402ca5e	449	platform_set_drvdata(pdev, info);
28db3888 HZ	450
	451	info->ac.name = "max8925-ac";
	452	info->ac.type = POWER_SUPPLY_TYPE_MAINS;
	453	info->ac.properties = max8925_ac_props;
	454	info->ac.num_properties = ARRAY_SIZE(max8925_ac_props);
	455	info->ac.get_property = max8925_ac_get_prop;
e7a5f6d5 PR	456	info->ac.supplied_to = pdata->supplied_to;
e7a5f6d5 PR	457	info->ac.num_supplicants = pdata->num_supplicants;
28db3888 HZ	458	ret = power_supply_register(&pdev->dev, &info->ac);
	459	if (ret)
	460	goto out;
	461	info->ac.dev->parent = &pdev->dev;
	462
	463	info->usb.name = "max8925-usb";
	464	info->usb.type = POWER_SUPPLY_TYPE_USB;
	465	info->usb.properties = max8925_usb_props;
	466	info->usb.num_properties = ARRAY_SIZE(max8925_usb_props);
	467	info->usb.get_property = max8925_usb_get_prop;
e7a5f6d5 PR	468	info->usb.supplied_to = pdata->supplied_to;
	469	info->usb.num_supplicants = pdata->num_supplicants;
	470
28db3888 HZ	471	ret = power_supply_register(&pdev->dev, &info->usb);
	472	if (ret)
	473	goto out_usb;
	474	info->usb.dev->parent = &pdev->dev;
	475
	476	info->battery.name = "max8925-battery";
	477	info->battery.type = POWER_SUPPLY_TYPE_BATTERY;
	478	info->battery.properties = max8925_battery_props;
	479	info->battery.num_properties = ARRAY_SIZE(max8925_battery_props);
	480	info->battery.get_property = max8925_bat_get_prop;
	481	ret = power_supply_register(&pdev->dev, &info->battery);
	482	if (ret)
	483	goto out_battery;
	484	info->battery.dev->parent = &pdev->dev;
	485
	486	info->batt_detect = pdata->batt_detect;
	487	info->topoff_threshold = pdata->topoff_threshold;
	488	info->fast_charge = pdata->fast_charge;
	489	info->set_charger = pdata->set_charger;
92de378b	490	info->no_temp_support = pdata->no_temp_support;
5ba1fa0a	491	info->no_insert_detect = pdata->no_insert_detect;
28db3888 HZ	492
	493	max8925_init_charger(chip, info);
	494	return 0;
	495	out_battery:
	496	power_supply_unregister(&info->battery);
	497	out_usb:
	498	power_supply_unregister(&info->ac);
	499	out:
	500	kfree(info);
	501	return ret;
	502	}
	503
415ec69f	504	static int max8925_power_remove(struct platform_device *pdev)
28db3888 HZ	505	{
	506	struct max8925_power_info *info = platform_get_drvdata(pdev);
	507
	508	if (info) {
	509	power_supply_unregister(&info->ac);
	510	power_supply_unregister(&info->usb);
	511	power_supply_unregister(&info->battery);
	512	max8925_deinit_charger(info);
	513	kfree(info);
	514	}
	515	return 0;
	516	}
	517
	518	static struct platform_driver max8925_power_driver = {
	519	.probe = max8925_power_probe,
28ea73f4	520	.remove = max8925_power_remove,
28db3888 HZ	521	.driver = {
	522	.name = "max8925-power",
	523	},
	524	};
	525
300bac7f	526	module_platform_driver(max8925_power_driver);
28db3888 HZ	527
	528	MODULE_LICENSE("GPL");
	529	MODULE_DESCRIPTION("Power supply driver for MAX8925");
	530	MODULE_ALIAS("platform:max8925-power");