[linux.git] / drivers / power / da9052-battery.c

/*
 * Batttery Driver for Dialog DA9052 PMICs
 *
 * Copyright(c) 2011 Dialog Semiconductor Ltd.
 *
 * Author: David Dajun Chen <[email protected]>
 *
 * This program is free software; you can redistribute  it and/or modify it
 * under  the terms of  the GNU General  Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 */

#include <linux/delay.h>
#include <linux/freezer.h>
#include <linux/fs.h>
#include <linux/jiffies.h>
#include <linux/module.h>
#include <linux/timer.h>
#include <linux/uaccess.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>

#include <linux/mfd/da9052/da9052.h>
#include <linux/mfd/da9052/pdata.h>
#include <linux/mfd/da9052/reg.h>

/* STATIC CONFIGURATION */
#define DA9052_BAT_CUTOFF_VOLT		2800
#define DA9052_BAT_TSH			62000
#define DA9052_BAT_LOW_CAP		4
#define DA9052_AVG_SZ			4
#define DA9052_VC_TBL_SZ		68
#define DA9052_VC_TBL_REF_SZ		3

#define DA9052_ISET_USB_MASK		0x0F
#define DA9052_CHG_USB_ILIM_MASK	0x40
#define DA9052_CHG_LIM_COLS		16

#define DA9052_MEAN(x, y)		((x + y) / 2)

enum charger_type_enum {
	DA9052_NOCHARGER = 1,
	DA9052_CHARGER,
};

static const u16 da9052_chg_current_lim[2][DA9052_CHG_LIM_COLS] = {
	{70,  80,  90,  100, 110, 120, 400,  450,
	 500, 550, 600, 650, 700, 900, 1100, 1300},
	{80,  90,  100, 110,  120,  400,  450,  500,
	 550, 600, 800, 1000, 1200, 1400, 1600, 1800},
};

static const u16 vc_tbl_ref[3] = {10, 25, 40};
/* Lookup table for voltage vs capacity */
static u32 const vc_tbl[3][68][2] = {
	/* For temperature 10 degree Celsius */
	{
	{4082, 100}, {4036, 98},
	{4020, 96}, {4008, 95},
	{3997, 93}, {3983, 91},
	{3964, 90}, {3943, 88},
	{3926, 87}, {3912, 85},
	{3900, 84}, {3890, 82},
	{3881, 80}, {3873, 79},
	{3865, 77}, {3857, 76},
	{3848, 74}, {3839, 73},
	{3829, 71}, {3820, 70},
	{3811, 68}, {3802, 67},
	{3794, 65}, {3785, 64},
	{3778, 62}, {3770, 61},
	{3763, 59}, {3756, 58},
	{3750, 56}, {3744, 55},
	{3738, 53}, {3732, 52},
	{3727, 50}, {3722, 49},
	{3717, 47}, {3712, 46},
	{3708, 44}, {3703, 43},
	{3700, 41}, {3696, 40},
	{3693, 38}, {3691, 37},
	{3688, 35}, {3686, 34},
	{3683, 32}, {3681, 31},
	{3678, 29}, {3675, 28},
	{3672, 26}, {3669, 25},
	{3665, 23}, {3661, 22},
	{3656, 21}, {3651, 19},
	{3645, 18}, {3639, 16},
	{3631, 15}, {3622, 13},
	{3611, 12}, {3600, 10},
	{3587, 9}, {3572, 7},
	{3548, 6}, {3503, 5},
	{3420, 3}, {3268, 2},
	{2992, 1}, {2746, 0}
	},
	/* For temperature 25 degree Celsius */
	{
	{4102, 100}, {4065, 98},
	{4048, 96}, {4034, 95},
	{4021, 93}, {4011, 92},
	{4001, 90}, {3986, 88},
	{3968, 87}, {3952, 85},
	{3938, 84}, {3926, 82},
	{3916, 81}, {3908, 79},
	{3900, 77}, {3892, 76},
	{3883, 74}, {3874, 73},
	{3864, 71}, {3855, 70},
	{3846, 68}, {3836, 67},
	{3827, 65}, {3819, 64},
	{3810, 62}, {3801, 61},
	{3793, 59}, {3786, 58},
	{3778, 56}, {3772, 55},
	{3765, 53}, {3759, 52},
	{3754, 50}, {3748, 49},
	{3743, 47}, {3738, 46},
	{3733, 44}, {3728, 43},
	{3724, 41}, {3720, 40},
	{3716, 38}, {3712, 37},
	{3709, 35}, {3706, 34},
	{3703, 33}, {3701, 31},
	{3698, 30}, {3696, 28},
	{3693, 27}, {3690, 25},
	{3687, 24}, {3683, 22},
	{3680, 21}, {3675, 19},
	{3671, 18}, {3666, 17},
	{3660, 15}, {3654, 14},
	{3647, 12}, {3639, 11},
	{3630, 9}, {3621, 8},
	{3613, 6}, {3606, 5},
	{3597, 4}, {3582, 2},
	{3546, 1}, {2747, 0}
	},
	/* For temperature 40 degree Celsius */
	{
	{4114, 100}, {4081, 98},
	{4065, 96}, {4050, 95},
	{4036, 93}, {4024, 92},
	{4013, 90}, {4002, 88},
	{3990, 87}, {3976, 85},
	{3962, 84}, {3950, 82},
	{3939, 81}, {3930, 79},
	{3921, 77}, {3912, 76},
	{3902, 74}, {3893, 73},
	{3883, 71}, {3874, 70},
	{3865, 68}, {3856, 67},
	{3847, 65}, {3838, 64},
	{3829, 62}, {3820, 61},
	{3812, 59}, {3803, 58},
	{3795, 56}, {3787, 55},
	{3780, 53}, {3773, 52},
	{3767, 50}, {3761, 49},
	{3756, 47}, {3751, 46},
	{3746, 44}, {3741, 43},
	{3736, 41}, {3732, 40},
	{3728, 38}, {3724, 37},
	{3720, 35}, {3716, 34},
	{3713, 33}, {3710, 31},
	{3707, 30}, {3704, 28},
	{3701, 27}, {3698, 25},
	{3695, 24}, {3691, 22},
	{3686, 21}, {3681, 19},
	{3676, 18}, {3671, 17},
	{3666, 15}, {3661, 14},
	{3655, 12}, {3648, 11},
	{3640, 9}, {3632, 8},
	{3622, 6}, {3616, 5},
	{3611, 4}, {3604, 2},
	{3594, 1}, {2747, 0}
	}
};

struct da9052_battery {
	struct da9052 *da9052;
	struct power_supply *psy;
	struct notifier_block nb;
	int charger_type;
	int status;
	int health;
};

static inline int volt_reg_to_mV(int value)
{
	return ((value * 1000) / 512) + 2500;
}

static inline int ichg_reg_to_mA(int value)
{
	return (value * 3900) / 1000;
}

static int da9052_read_chgend_current(struct da9052_battery *bat,
				       int *current_mA)
{
	int ret;

	if (bat->status == POWER_SUPPLY_STATUS_DISCHARGING)
		return -EINVAL;

	ret = da9052_reg_read(bat->da9052, DA9052_ICHG_END_REG);
	if (ret < 0)
		return ret;

	*current_mA = ichg_reg_to_mA(ret & DA9052_ICHGEND_ICHGEND);

	return 0;
}

static int da9052_read_chg_current(struct da9052_battery *bat, int *current_mA)
{
	int ret;

	if (bat->status == POWER_SUPPLY_STATUS_DISCHARGING)
		return -EINVAL;

	ret = da9052_reg_read(bat->da9052, DA9052_ICHG_AV_REG);
	if (ret < 0)
		return ret;

	*current_mA = ichg_reg_to_mA(ret & DA9052_ICHGAV_ICHGAV);

	return 0;
}

static int da9052_bat_check_status(struct da9052_battery *bat, int *status)
{
	u8 v[2] = {0, 0};
	u8 bat_status;
	u8 chg_end;
	int ret;
	int chg_current;
	int chg_end_current;
	bool dcinsel;
	bool dcindet;
	bool vbussel;
	bool vbusdet;
	bool dc;
	bool vbus;

	ret = da9052_group_read(bat->da9052, DA9052_STATUS_A_REG, 2, v);
	if (ret < 0)
		return ret;

	bat_status = v[0];
	chg_end = v[1];

	dcinsel = bat_status & DA9052_STATUSA_DCINSEL;
	dcindet = bat_status & DA9052_STATUSA_DCINDET;
	vbussel = bat_status & DA9052_STATUSA_VBUSSEL;
	vbusdet = bat_status & DA9052_STATUSA_VBUSDET;
	dc = dcinsel && dcindet;
	vbus = vbussel && vbusdet;

	/* Preference to WALL(DCIN) charger unit */
	if (dc || vbus) {
		bat->charger_type = DA9052_CHARGER;

		/* If charging end flag is set and Charging current is greater
		 * than charging end limit then battery is charging
		*/
		if ((chg_end & DA9052_STATUSB_CHGEND) != 0) {
			ret = da9052_read_chg_current(bat, &chg_current);
			if (ret < 0)
				return ret;
			ret = da9052_read_chgend_current(bat, &chg_end_current);
			if (ret < 0)
				return ret;

			if (chg_current >= chg_end_current)
				bat->status = POWER_SUPPLY_STATUS_CHARGING;
			else
				bat->status = POWER_SUPPLY_STATUS_NOT_CHARGING;
		} else {
			/* If Charging end flag is cleared then battery is
			 * charging
			*/
			bat->status = POWER_SUPPLY_STATUS_CHARGING;
		}
	} else if (dcindet || vbusdet) {
			bat->charger_type = DA9052_CHARGER;
			bat->status = POWER_SUPPLY_STATUS_NOT_CHARGING;
	} else {
		bat->charger_type = DA9052_NOCHARGER;
		bat->status = POWER_SUPPLY_STATUS_DISCHARGING;
	}

	if (status != NULL)
		*status = bat->status;
	return 0;
}

static int da9052_bat_read_volt(struct da9052_battery *bat, int *volt_mV)
{
	int volt;

	volt = da9052_adc_manual_read(bat->da9052, DA9052_ADC_MAN_MUXSEL_VBAT);
	if (volt < 0)
		return volt;

	*volt_mV = volt_reg_to_mV(volt);

	return 0;
}

static int da9052_bat_check_presence(struct da9052_battery *bat, int *illegal)
{
	int bat_temp;

	bat_temp = da9052_adc_read_temp(bat->da9052);
	if (bat_temp < 0)
		return bat_temp;

	if (bat_temp > DA9052_BAT_TSH)
		*illegal = 1;
	else
		*illegal = 0;

	return 0;
}

static int da9052_bat_interpolate(int vbat_lower, int  vbat_upper,
				   int level_lower, int level_upper,
				   int bat_voltage)
{
	int tmp;

	tmp = ((level_upper - level_lower) * 1000) / (vbat_upper - vbat_lower);
	tmp = level_lower + (((bat_voltage - vbat_lower) * tmp) / 1000);

	return tmp;
}

static unsigned char da9052_determine_vc_tbl_index(unsigned char adc_temp)
{
	int i;

	if (adc_temp <= vc_tbl_ref[0])
		return 0;

	if (adc_temp > vc_tbl_ref[DA9052_VC_TBL_REF_SZ - 1])
		return DA9052_VC_TBL_REF_SZ - 1;

	for (i = 0; i < DA9052_VC_TBL_REF_SZ - 1; i++) {
		if ((adc_temp > vc_tbl_ref[i]) &&
		    (adc_temp <= DA9052_MEAN(vc_tbl_ref[i], vc_tbl_ref[i + 1])))
				return i;
		if ((adc_temp > DA9052_MEAN(vc_tbl_ref[i], vc_tbl_ref[i + 1]))
		     && (adc_temp <= vc_tbl_ref[i]))
				return i + 1;
	}
	/*
	 * For some reason authors of the driver didn't presume that we can
	 * end up here. It might be OK, but might be not, no one knows for
	 * sure. Go check your battery, is it on fire?
	 */
	WARN_ON(1);
	return 0;
}

static int da9052_bat_read_capacity(struct da9052_battery *bat, int *capacity)
{
	int adc_temp;
	int bat_voltage;
	int vbat_lower;
	int vbat_upper;
	int level_upper;
	int level_lower;
	int ret;
	int flag;
	int i = 0;
	int j;

	ret = da9052_bat_read_volt(bat, &bat_voltage);
	if (ret < 0)
		return ret;

	adc_temp = da9052_adc_read_temp(bat->da9052);
	if (adc_temp < 0)
		return adc_temp;

	i = da9052_determine_vc_tbl_index(adc_temp);

	if (bat_voltage >= vc_tbl[i][0][0]) {
		*capacity = 100;
		return 0;
	}
	if (bat_voltage <= vc_tbl[i][DA9052_VC_TBL_SZ - 1][0]) {
		*capacity = 0;
		return 0;
	}
	flag = 0;

	for (j = 0; j < (DA9052_VC_TBL_SZ-1); j++) {
		if ((bat_voltage <= vc_tbl[i][j][0]) &&
		    (bat_voltage >= vc_tbl[i][j + 1][0])) {
			vbat_upper = vc_tbl[i][j][0];
			vbat_lower = vc_tbl[i][j + 1][0];
			level_upper = vc_tbl[i][j][1];
			level_lower = vc_tbl[i][j + 1][1];
			flag = 1;
			break;
		}
	}
	if (!flag)
		return -EIO;

	*capacity = da9052_bat_interpolate(vbat_lower, vbat_upper, level_lower,
					   level_upper, bat_voltage);

	return 0;
}

static int da9052_bat_check_health(struct da9052_battery *bat, int *health)
{
	int ret;
	int bat_illegal;
	int capacity;

	ret = da9052_bat_check_presence(bat, &bat_illegal);
	if (ret < 0)
		return ret;

	if (bat_illegal) {
		bat->health = POWER_SUPPLY_HEALTH_UNKNOWN;
		return 0;
	}

	if (bat->health != POWER_SUPPLY_HEALTH_OVERHEAT) {
		ret = da9052_bat_read_capacity(bat, &capacity);
		if (ret < 0)
			return ret;
		if (capacity < DA9052_BAT_LOW_CAP)
			bat->health = POWER_SUPPLY_HEALTH_DEAD;
		else
			bat->health = POWER_SUPPLY_HEALTH_GOOD;
	}

	*health = bat->health;

	return 0;
}

static irqreturn_t da9052_bat_irq(int irq, void *data)
{
	struct da9052_battery *bat = data;
	int virq;

	virq = regmap_irq_get_virq(bat->da9052->irq_data, irq);
	irq -= virq;

	if (irq == DA9052_IRQ_CHGEND)
		bat->status = POWER_SUPPLY_STATUS_FULL;
	else
		da9052_bat_check_status(bat, NULL);

	if (irq == DA9052_IRQ_CHGEND || irq == DA9052_IRQ_DCIN ||
	    irq == DA9052_IRQ_VBUS || irq == DA9052_IRQ_TBAT) {
		power_supply_changed(bat->psy);
	}

	return IRQ_HANDLED;
}

static int da9052_USB_current_notifier(struct notifier_block *nb,
					unsigned long events, void *data)
{
	u8 row;
	u8 col;
	int *current_mA = data;
	int ret;
	struct da9052_battery *bat = container_of(nb, struct da9052_battery,
						  nb);

	if (bat->status == POWER_SUPPLY_STATUS_DISCHARGING)
		return -EPERM;

	ret = da9052_reg_read(bat->da9052, DA9052_CHGBUCK_REG);
	if (ret & DA9052_CHG_USB_ILIM_MASK)
		return -EPERM;

	if (bat->da9052->chip_id == DA9052)
		row = 0;
	else
		row = 1;

	if (*current_mA < da9052_chg_current_lim[row][0] ||
	    *current_mA > da9052_chg_current_lim[row][DA9052_CHG_LIM_COLS - 1])
		return -EINVAL;

	for (col = 0; col <= DA9052_CHG_LIM_COLS - 1 ; col++) {
		if (*current_mA <= da9052_chg_current_lim[row][col])
			break;
	}

	return da9052_reg_update(bat->da9052, DA9052_ISET_REG,
				 DA9052_ISET_USB_MASK, col);
}

static int da9052_bat_get_property(struct power_supply *psy,
				    enum power_supply_property psp,
				    union power_supply_propval *val)
{
	int ret;
	int illegal;
	struct da9052_battery *bat = power_supply_get_drvdata(psy);

	ret = da9052_bat_check_presence(bat, &illegal);
	if (ret < 0)
		return ret;

	if (illegal && psp != POWER_SUPPLY_PROP_PRESENT)
		return -ENODEV;

	switch (psp) {
	case POWER_SUPPLY_PROP_STATUS:
		ret = da9052_bat_check_status(bat, &val->intval);
		break;
	case POWER_SUPPLY_PROP_ONLINE:
		val->intval =
			(bat->charger_type == DA9052_NOCHARGER) ? 0 : 1;
		break;
	case POWER_SUPPLY_PROP_PRESENT:
		ret = da9052_bat_check_presence(bat, &val->intval);
		break;
	case POWER_SUPPLY_PROP_HEALTH:
		ret = da9052_bat_check_health(bat, &val->intval);
		break;
	case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
		val->intval = DA9052_BAT_CUTOFF_VOLT * 1000;
		break;
	case POWER_SUPPLY_PROP_VOLTAGE_AVG:
		ret = da9052_bat_read_volt(bat, &val->intval);
		break;
	case POWER_SUPPLY_PROP_CURRENT_AVG:
		ret = da9052_read_chg_current(bat, &val->intval);
		break;
	case POWER_SUPPLY_PROP_CAPACITY:
		ret = da9052_bat_read_capacity(bat, &val->intval);
		break;
	case POWER_SUPPLY_PROP_TEMP:
		val->intval = da9052_adc_read_temp(bat->da9052);
		ret = val->intval;
		break;
	case POWER_SUPPLY_PROP_TECHNOLOGY:
		val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
		break;
	default:
		return -EINVAL;
	}
	return ret;
}

static enum power_supply_property da9052_bat_props[] = {
	POWER_SUPPLY_PROP_STATUS,
	POWER_SUPPLY_PROP_ONLINE,
	POWER_SUPPLY_PROP_PRESENT,
	POWER_SUPPLY_PROP_HEALTH,
	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
	POWER_SUPPLY_PROP_VOLTAGE_AVG,
	POWER_SUPPLY_PROP_CURRENT_AVG,
	POWER_SUPPLY_PROP_CAPACITY,
	POWER_SUPPLY_PROP_TEMP,
	POWER_SUPPLY_PROP_TECHNOLOGY,
};

static struct power_supply_desc psy_desc = {
	.name		= "da9052-bat",
	.type		= POWER_SUPPLY_TYPE_BATTERY,
	.properties	= da9052_bat_props,
	.num_properties	= ARRAY_SIZE(da9052_bat_props),
	.get_property	= da9052_bat_get_property,
};

static char *da9052_bat_irqs[] = {
	"BATT TEMP",
	"DCIN DET",
	"DCIN REM",
	"VBUS DET",
	"VBUS REM",
	"CHG END",
};

static int da9052_bat_irq_bits[] = {
	DA9052_IRQ_TBAT,
	DA9052_IRQ_DCIN,
	DA9052_IRQ_DCINREM,
	DA9052_IRQ_VBUS,
	DA9052_IRQ_VBUSREM,
	DA9052_IRQ_CHGEND,
};

static s32 da9052_bat_probe(struct platform_device *pdev)
{
	struct da9052_pdata *pdata;
	struct da9052_battery *bat;
	struct power_supply_config psy_cfg = {};
	int ret;
	int i;

	bat = devm_kzalloc(&pdev->dev, sizeof(struct da9052_battery),
				GFP_KERNEL);
	if (!bat)
		return -ENOMEM;

	psy_cfg.drv_data = bat;

	bat->da9052 = dev_get_drvdata(pdev->dev.parent);
	bat->charger_type = DA9052_NOCHARGER;
	bat->status = POWER_SUPPLY_STATUS_UNKNOWN;
	bat->health = POWER_SUPPLY_HEALTH_UNKNOWN;
	bat->nb.notifier_call = da9052_USB_current_notifier;

	pdata = bat->da9052->dev->platform_data;
	if (pdata != NULL && pdata->use_for_apm)
		psy_desc.use_for_apm = pdata->use_for_apm;
	else
		psy_desc.use_for_apm = 1;

	for (i = 0; i < ARRAY_SIZE(da9052_bat_irqs); i++) {
		ret = da9052_request_irq(bat->da9052,
				da9052_bat_irq_bits[i], da9052_bat_irqs[i],
				da9052_bat_irq, bat);

		if (ret != 0) {
			dev_err(bat->da9052->dev,
				"DA9052 failed to request %s IRQ: %d\n",
				da9052_bat_irqs[i], ret);
			goto err;
		}
	}

	bat->psy = power_supply_register(&pdev->dev, &psy_desc, &psy_cfg);
	if (IS_ERR(bat->psy)) {
		ret = PTR_ERR(bat->psy);
		goto err;
	}

	platform_set_drvdata(pdev, bat);
	return 0;

err:
	while (--i >= 0)
		da9052_free_irq(bat->da9052, da9052_bat_irq_bits[i], bat);

	return ret;
}
static int da9052_bat_remove(struct platform_device *pdev)
{
	int i;
	struct da9052_battery *bat = platform_get_drvdata(pdev);

	for (i = 0; i < ARRAY_SIZE(da9052_bat_irqs); i++)
		da9052_free_irq(bat->da9052, da9052_bat_irq_bits[i], bat);

	power_supply_unregister(bat->psy);

	return 0;
}

static struct platform_driver da9052_bat_driver = {
	.probe = da9052_bat_probe,
	.remove = da9052_bat_remove,
	.driver = {
		.name = "da9052-bat",
	},
};
module_platform_driver(da9052_bat_driver);

MODULE_DESCRIPTION("DA9052 BAT Device Driver");
MODULE_AUTHOR("David Dajun Chen <[email protected]>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:da9052-bat");
Commit	Line	Data
ded7fc7b AJ	1	/*
	2	* Batttery Driver for Dialog DA9052 PMICs
	3	*
	4	* Copyright(c) 2011 Dialog Semiconductor Ltd.
	5	*
	6	* Author: David Dajun Chen <[email protected]>
	7	*
	8	* This program is free software; you can redistribute it and/or modify it
	9	* under the terms of the GNU General Public License as published by the
	10	* Free Software Foundation; either version 2 of the License, or (at your
	11	* option) any later version.
	12	*/
	13
	14	#include <linux/delay.h>
	15	#include <linux/freezer.h>
	16	#include <linux/fs.h>
	17	#include <linux/jiffies.h>
	18	#include <linux/module.h>
	19	#include <linux/timer.h>
	20	#include <linux/uaccess.h>
	21	#include <linux/platform_device.h>
	22	#include <linux/power_supply.h>
	23
	24	#include <linux/mfd/da9052/da9052.h>
	25	#include <linux/mfd/da9052/pdata.h>
	26	#include <linux/mfd/da9052/reg.h>
	27
	28	/* STATIC CONFIGURATION */
	29	#define DA9052_BAT_CUTOFF_VOLT 2800
	30	#define DA9052_BAT_TSH 62000
	31	#define DA9052_BAT_LOW_CAP 4
	32	#define DA9052_AVG_SZ 4
	33	#define DA9052_VC_TBL_SZ 68
	34	#define DA9052_VC_TBL_REF_SZ 3
	35
	36	#define DA9052_ISET_USB_MASK 0x0F
	37	#define DA9052_CHG_USB_ILIM_MASK 0x40
	38	#define DA9052_CHG_LIM_COLS 16
	39
	40	#define DA9052_MEAN(x, y) ((x + y) / 2)
	41
	42	enum charger_type_enum {
	43	DA9052_NOCHARGER = 1,
	44	DA9052_CHARGER,
	45	};
	46
	47	static const u16 da9052_chg_current_lim[2][DA9052_CHG_LIM_COLS] = {
	48	{70, 80, 90, 100, 110, 120, 400, 450,
	49	500, 550, 600, 650, 700, 900, 1100, 1300},
	50	{80, 90, 100, 110, 120, 400, 450, 500,
	51	550, 600, 800, 1000, 1200, 1400, 1600, 1800},
	52	};
	53
	54	static const u16 vc_tbl_ref[3] = {10, 25, 40};
	55	/* Lookup table for voltage vs capacity */
	56	static u32 const vc_tbl[3][68][2] = {
	57	/* For temperature 10 degree Celsius */
	58	{
	59	{4082, 100}, {4036, 98},
	60	{4020, 96}, {4008, 95},
	61	{3997, 93}, {3983, 91},
	62	{3964, 90}, {3943, 88},
	63	{3926, 87}, {3912, 85},
	64	{3900, 84}, {3890, 82},
65	{3881, 80}, {3873, 79},
66	{3865, 77}, {3857, 76},
67	{3848, 74}, {3839, 73},
68	{3829, 71}, {3820, 70},
69	{3811, 68}, {3802, 67},
70	{3794, 65}, {3785, 64},
71	{3778, 62}, {3770, 61},
72	{3763, 59}, {3756, 58},
73	{3750, 56}, {3744, 55},
74	{3738, 53}, {3732, 52},
75	{3727, 50}, {3722, 49},
76	{3717, 47}, {3712, 46},
77	{3708, 44}, {3703, 43},
78	{3700, 41}, {3696, 40},
79	{3693, 38}, {3691, 37},
80	{3688, 35}, {3686, 34},
81	{3683, 32}, {3681, 31},
82	{3678, 29}, {3675, 28},
83	{3672, 26}, {3669, 25},
84	{3665, 23}, {3661, 22},
85	{3656, 21}, {3651, 19},
86	{3645, 18}, {3639, 16},
87	{3631, 15}, {3622, 13},
88	{3611, 12}, {3600, 10},
89	{3587, 9}, {3572, 7},
90	{3548, 6}, {3503, 5},
91	{3420, 3}, {3268, 2},
92	{2992, 1}, {2746, 0}
93	},
94	/* For temperature 25 degree Celsius */
95	{
96	{4102, 100}, {4065, 98},
97	{4048, 96}, {4034, 95},
98	{4021, 93}, {4011, 92},
99	{4001, 90}, {3986, 88},
100	{3968, 87}, {3952, 85},
101	{3938, 84}, {3926, 82},
102	{3916, 81}, {3908, 79},
103	{3900, 77}, {3892, 76},
104	{3883, 74}, {3874, 73},
105	{3864, 71}, {3855, 70},
106	{3846, 68}, {3836, 67},
107	{3827, 65}, {3819, 64},
108	{3810, 62}, {3801, 61},
109	{3793, 59}, {3786, 58},
110	{3778, 56}, {3772, 55},
111	{3765, 53}, {3759, 52},
112	{3754, 50}, {3748, 49},
113	{3743, 47}, {3738, 46},
114	{3733, 44}, {3728, 43},
115	{3724, 41}, {3720, 40},
116	{3716, 38}, {3712, 37},
117	{3709, 35}, {3706, 34},
118	{3703, 33}, {3701, 31},
119	{3698, 30}, {3696, 28},
120	{3693, 27}, {3690, 25},
121	{3687, 24}, {3683, 22},
122	{3680, 21}, {3675, 19},
123	{3671, 18}, {3666, 17},
124	{3660, 15}, {3654, 14},
125	{3647, 12}, {3639, 11},
126	{3630, 9}, {3621, 8},
127	{3613, 6}, {3606, 5},
128	{3597, 4}, {3582, 2},
129	{3546, 1}, {2747, 0}
130	},
131	/* For temperature 40 degree Celsius */
132	{
133	{4114, 100}, {4081, 98},
134	{4065, 96}, {4050, 95},
135	{4036, 93}, {4024, 92},
136	{4013, 90}, {4002, 88},
137	{3990, 87}, {3976, 85},
138	{3962, 84}, {3950, 82},
139	{3939, 81}, {3930, 79},
140	{3921, 77}, {3912, 76},
141	{3902, 74}, {3893, 73},
142	{3883, 71}, {3874, 70},
143	{3865, 68}, {3856, 67},
144	{3847, 65}, {3838, 64},
145	{3829, 62}, {3820, 61},
146	{3812, 59}, {3803, 58},
147	{3795, 56}, {3787, 55},
148	{3780, 53}, {3773, 52},
149	{3767, 50}, {3761, 49},
150	{3756, 47}, {3751, 46},
151	{3746, 44}, {3741, 43},
152	{3736, 41}, {3732, 40},
153	{3728, 38}, {3724, 37},
154	{3720, 35}, {3716, 34},
155	{3713, 33}, {3710, 31},
156	{3707, 30}, {3704, 28},
157	{3701, 27}, {3698, 25},
158	{3695, 24}, {3691, 22},
159	{3686, 21}, {3681, 19},
160	{3676, 18}, {3671, 17},
161	{3666, 15}, {3661, 14},
162	{3655, 12}, {3648, 11},
163	{3640, 9}, {3632, 8},
164	{3622, 6}, {3616, 5},
165	{3611, 4}, {3604, 2},
166	{3594, 1}, {2747, 0}
167	}
168	};
169
170	struct da9052_battery {
171	struct da9052 *da9052;
297d716f	172	struct power_supply *psy;
ded7fc7b AJ	173	struct notifier_block nb;
	174	int charger_type;
	175	int status;
	176	int health;
	177	};
	178
	179	static inline int volt_reg_to_mV(int value)
	180	{
	181	return ((value * 1000) / 512) + 2500;
	182	}
	183
	184	static inline int ichg_reg_to_mA(int value)
	185	{
	186	return (value * 3900) / 1000;
	187	}
	188
	189	static int da9052_read_chgend_current(struct da9052_battery *bat,
	190	int *current_mA)
	191	{
	192	int ret;
	193
	194	if (bat->status == POWER_SUPPLY_STATUS_DISCHARGING)
	195	return -EINVAL;
	196
	197	ret = da9052_reg_read(bat->da9052, DA9052_ICHG_END_REG);
	198	if (ret < 0)
	199	return ret;
	200
	201	*current_mA = ichg_reg_to_mA(ret & DA9052_ICHGEND_ICHGEND);
	202
	203	return 0;
	204	}
	205
	206	static int da9052_read_chg_current(struct da9052_battery bat, int current_mA)
	207	{
	208	int ret;
	209
	210	if (bat->status == POWER_SUPPLY_STATUS_DISCHARGING)
	211	return -EINVAL;
	212
	213	ret = da9052_reg_read(bat->da9052, DA9052_ICHG_AV_REG);
	214	if (ret < 0)
	215	return ret;
	216
	217	*current_mA = ichg_reg_to_mA(ret & DA9052_ICHGAV_ICHGAV);
	218
	219	return 0;
	220	}
	221
	222	static int da9052_bat_check_status(struct da9052_battery bat, int status)
	223	{
	224	u8 v[2] = {0, 0};
	225	u8 bat_status;
	226	u8 chg_end;
	227	int ret;
	228	int chg_current;
	229	int chg_end_current;
	230	bool dcinsel;
	231	bool dcindet;
	232	bool vbussel;
	233	bool vbusdet;
	234	bool dc;
	235	bool vbus;
	236
237	ret = da9052_group_read(bat->da9052, DA9052_STATUS_A_REG, 2, v);
238	if (ret < 0)
239	return ret;
240
241	bat_status = v[0];
242	chg_end = v[1];
243
244	dcinsel = bat_status & DA9052_STATUSA_DCINSEL;
245	dcindet = bat_status & DA9052_STATUSA_DCINDET;
246	vbussel = bat_status & DA9052_STATUSA_VBUSSEL;
247	vbusdet = bat_status & DA9052_STATUSA_VBUSDET;
248	dc = dcinsel && dcindet;
249	vbus = vbussel && vbusdet;
250
251	/* Preference to WALL(DCIN) charger unit */
252	if (dc \|\| vbus) {
253	bat->charger_type = DA9052_CHARGER;
254
255	/* If charging end flag is set and Charging current is greater
256	* than charging end limit then battery is charging
257	*/
258	if ((chg_end & DA9052_STATUSB_CHGEND) != 0) {
259	ret = da9052_read_chg_current(bat, &chg_current);
260	if (ret < 0)
261	return ret;
262	ret = da9052_read_chgend_current(bat, &chg_end_current);
263	if (ret < 0)
264	return ret;
265
266	if (chg_current >= chg_end_current)
267	bat->status = POWER_SUPPLY_STATUS_CHARGING;
268	else
269	bat->status = POWER_SUPPLY_STATUS_NOT_CHARGING;
270	} else {
271	/* If Charging end flag is cleared then battery is
272	* charging
273	*/
274	bat->status = POWER_SUPPLY_STATUS_CHARGING;
275	}
276	} else if (dcindet \|\| vbusdet) {
277	bat->charger_type = DA9052_CHARGER;
278	bat->status = POWER_SUPPLY_STATUS_NOT_CHARGING;
279	} else {
280	bat->charger_type = DA9052_NOCHARGER;
281	bat->status = POWER_SUPPLY_STATUS_DISCHARGING;
282	}
283
284	if (status != NULL)
285	*status = bat->status;
286	return 0;
287	}
288
289	static int da9052_bat_read_volt(struct da9052_battery bat, int volt_mV)
290	{
291	int volt;
292
293	volt = da9052_adc_manual_read(bat->da9052, DA9052_ADC_MAN_MUXSEL_VBAT);
294	if (volt < 0)
295	return volt;
296
297	*volt_mV = volt_reg_to_mV(volt);
298
299	return 0;
300	}
301
302	static int da9052_bat_check_presence(struct da9052_battery bat, int illegal)
303	{
304	int bat_temp;
305
306	bat_temp = da9052_adc_read_temp(bat->da9052);
307	if (bat_temp < 0)
308	return bat_temp;
309
310	if (bat_temp > DA9052_BAT_TSH)
311	*illegal = 1;
312	else
313	*illegal = 0;
314
315	return 0;
316	}
317
318	static int da9052_bat_interpolate(int vbat_lower, int vbat_upper,
319	int level_lower, int level_upper,
320	int bat_voltage)
321	{
322	int tmp;
323
324	tmp = ((level_upper - level_lower) * 1000) / (vbat_upper - vbat_lower);
325	tmp = level_lower + (((bat_voltage - vbat_lower) * tmp) / 1000);
326
327	return tmp;
328	}
329
bc909f27	330	static unsigned char da9052_determine_vc_tbl_index(unsigned char adc_temp)
ded7fc7b AJ	331	{
	332	int i;
	333
	334	if (adc_temp <= vc_tbl_ref[0])
	335	return 0;
	336
	337	if (adc_temp > vc_tbl_ref[DA9052_VC_TBL_REF_SZ - 1])
	338	return DA9052_VC_TBL_REF_SZ - 1;
	339
c4f34226	340	for (i = 0; i < DA9052_VC_TBL_REF_SZ - 1; i++) {
ded7fc7b AJ	341	if ((adc_temp > vc_tbl_ref[i]) &&
	342	(adc_temp <= DA9052_MEAN(vc_tbl_ref[i], vc_tbl_ref[i + 1])))
	343	return i;
	344	if ((adc_temp > DA9052_MEAN(vc_tbl_ref[i], vc_tbl_ref[i + 1]))
	345	&& (adc_temp <= vc_tbl_ref[i]))
	346	return i + 1;
	347	}
bc909f27 AV	348	/*
	349	* For some reason authors of the driver didn't presume that we can
	350	* end up here. It might be OK, but might be not, no one knows for
	351	* sure. Go check your battery, is it on fire?
	352	*/
	353	WARN_ON(1);
	354	return 0;
ded7fc7b AJ	355	}
	356
	357	static int da9052_bat_read_capacity(struct da9052_battery bat, int capacity)
	358	{
	359	int adc_temp;
	360	int bat_voltage;
	361	int vbat_lower;
	362	int vbat_upper;
	363	int level_upper;
	364	int level_lower;
	365	int ret;
	366	int flag;
	367	int i = 0;
	368	int j;
	369
	370	ret = da9052_bat_read_volt(bat, &bat_voltage);
	371	if (ret < 0)
	372	return ret;
	373
	374	adc_temp = da9052_adc_read_temp(bat->da9052);
	375	if (adc_temp < 0)
	376	return adc_temp;
	377
	378	i = da9052_determine_vc_tbl_index(adc_temp);
	379
	380	if (bat_voltage >= vc_tbl[i][0][0]) {
	381	*capacity = 100;
	382	return 0;
	383	}
	384	if (bat_voltage <= vc_tbl[i][DA9052_VC_TBL_SZ - 1][0]) {
	385	*capacity = 0;
	386	return 0;
	387	}
	388	flag = 0;
	389
	390	for (j = 0; j < (DA9052_VC_TBL_SZ-1); j++) {
	391	if ((bat_voltage <= vc_tbl[i][j][0]) &&
	392	(bat_voltage >= vc_tbl[i][j + 1][0])) {
	393	vbat_upper = vc_tbl[i][j][0];
	394	vbat_lower = vc_tbl[i][j + 1][0];
	395	level_upper = vc_tbl[i][j][1];
	396	level_lower = vc_tbl[i][j + 1][1];
	397	flag = 1;
	398	break;
	399	}
	400	}
	401	if (!flag)
	402	return -EIO;
	403
	404	*capacity = da9052_bat_interpolate(vbat_lower, vbat_upper, level_lower,
	405	level_upper, bat_voltage);
	406
	407	return 0;
	408	}
	409
	410	static int da9052_bat_check_health(struct da9052_battery bat, int health)
	411	{
	412	int ret;
	413	int bat_illegal;
	414	int capacity;
	415
	416	ret = da9052_bat_check_presence(bat, &bat_illegal);
	417	if (ret < 0)
	418	return ret;
419
420	if (bat_illegal) {
421	bat->health = POWER_SUPPLY_HEALTH_UNKNOWN;
422	return 0;
423	}
424
425	if (bat->health != POWER_SUPPLY_HEALTH_OVERHEAT) {
426	ret = da9052_bat_read_capacity(bat, &capacity);
427	if (ret < 0)
428	return ret;
429	if (capacity < DA9052_BAT_LOW_CAP)
430	bat->health = POWER_SUPPLY_HEALTH_DEAD;
431	else
432	bat->health = POWER_SUPPLY_HEALTH_GOOD;
433	}
434
435	*health = bat->health;
436
437	return 0;
438	}
439
440	static irqreturn_t da9052_bat_irq(int irq, void *data)
441	{
442	struct da9052_battery *bat = data;
4b5edf78	443	int virq;
ded7fc7b	444
4b5edf78 FE	445	virq = regmap_irq_get_virq(bat->da9052->irq_data, irq);
4b5edf78 FE	446	irq -= virq;
ded7fc7b AJ	447
	448	if (irq == DA9052_IRQ_CHGEND)
	449	bat->status = POWER_SUPPLY_STATUS_FULL;
	450	else
	451	da9052_bat_check_status(bat, NULL);
	452
	453	if (irq == DA9052_IRQ_CHGEND \|\| irq == DA9052_IRQ_DCIN \|\|
	454	irq == DA9052_IRQ_VBUS \|\| irq == DA9052_IRQ_TBAT) {
297d716f	455	power_supply_changed(bat->psy);
ded7fc7b AJ	456	}
	457
	458	return IRQ_HANDLED;
	459	}
	460
	461	static int da9052_USB_current_notifier(struct notifier_block *nb,
	462	unsigned long events, void *data)
	463	{
	464	u8 row;
	465	u8 col;
	466	int *current_mA = data;
	467	int ret;
	468	struct da9052_battery *bat = container_of(nb, struct da9052_battery,
	469	nb);
	470
	471	if (bat->status == POWER_SUPPLY_STATUS_DISCHARGING)
	472	return -EPERM;
	473
	474	ret = da9052_reg_read(bat->da9052, DA9052_CHGBUCK_REG);
	475	if (ret & DA9052_CHG_USB_ILIM_MASK)
	476	return -EPERM;
	477
	478	if (bat->da9052->chip_id == DA9052)
	479	row = 0;
	480	else
	481	row = 1;
	482
	483	if (*current_mA < da9052_chg_current_lim[row][0] \|\|
	484	*current_mA > da9052_chg_current_lim[row][DA9052_CHG_LIM_COLS - 1])
	485	return -EINVAL;
	486
	487	for (col = 0; col <= DA9052_CHG_LIM_COLS - 1 ; col++) {
	488	if (*current_mA <= da9052_chg_current_lim[row][col])
	489	break;
	490	}
	491
	492	return da9052_reg_update(bat->da9052, DA9052_ISET_REG,
	493	DA9052_ISET_USB_MASK, col);
	494	}
	495
	496	static int da9052_bat_get_property(struct power_supply *psy,
	497	enum power_supply_property psp,
	498	union power_supply_propval *val)
	499	{
	500	int ret;
	501	int illegal;
297d716f	502	struct da9052_battery *bat = power_supply_get_drvdata(psy);
ded7fc7b AJ	503
	504	ret = da9052_bat_check_presence(bat, &illegal);
	505	if (ret < 0)
	506	return ret;
	507
	508	if (illegal && psp != POWER_SUPPLY_PROP_PRESENT)
	509	return -ENODEV;
	510
	511	switch (psp) {
	512	case POWER_SUPPLY_PROP_STATUS:
	513	ret = da9052_bat_check_status(bat, &val->intval);
	514	break;
	515	case POWER_SUPPLY_PROP_ONLINE:
	516	val->intval =
	517	(bat->charger_type == DA9052_NOCHARGER) ? 0 : 1;
	518	break;
	519	case POWER_SUPPLY_PROP_PRESENT:
	520	ret = da9052_bat_check_presence(bat, &val->intval);
	521	break;
	522	case POWER_SUPPLY_PROP_HEALTH:
	523	ret = da9052_bat_check_health(bat, &val->intval);
	524	break;
	525	case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
	526	val->intval = DA9052_BAT_CUTOFF_VOLT * 1000;
	527	break;
	528	case POWER_SUPPLY_PROP_VOLTAGE_AVG:
	529	ret = da9052_bat_read_volt(bat, &val->intval);
	530	break;
	531	case POWER_SUPPLY_PROP_CURRENT_AVG:
	532	ret = da9052_read_chg_current(bat, &val->intval);
	533	break;
	534	case POWER_SUPPLY_PROP_CAPACITY:
	535	ret = da9052_bat_read_capacity(bat, &val->intval);
	536	break;
	537	case POWER_SUPPLY_PROP_TEMP:
	538	val->intval = da9052_adc_read_temp(bat->da9052);
	539	ret = val->intval;
	540	break;
	541	case POWER_SUPPLY_PROP_TECHNOLOGY:
	542	val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
	543	break;
	544	default:
	545	return -EINVAL;
	546	}
	547	return ret;
	548	}
	549
	550	static enum power_supply_property da9052_bat_props[] = {
	551	POWER_SUPPLY_PROP_STATUS,
	552	POWER_SUPPLY_PROP_ONLINE,
	553	POWER_SUPPLY_PROP_PRESENT,
	554	POWER_SUPPLY_PROP_HEALTH,
	555	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
	556	POWER_SUPPLY_PROP_VOLTAGE_AVG,
	557	POWER_SUPPLY_PROP_CURRENT_AVG,
	558	POWER_SUPPLY_PROP_CAPACITY,
	559	POWER_SUPPLY_PROP_TEMP,
	560	POWER_SUPPLY_PROP_TECHNOLOGY,
	561	};
	562
297d716f	563	static struct power_supply_desc psy_desc = {
ded7fc7b AJ	564	.name = "da9052-bat",
	565	.type = POWER_SUPPLY_TYPE_BATTERY,
	566	.properties = da9052_bat_props,
	567	.num_properties = ARRAY_SIZE(da9052_bat_props),
	568	.get_property = da9052_bat_get_property,
	569	};
	570
4b5edf78	571	static char *da9052_bat_irqs[] = {
ded7fc7b AJ	572	"BATT TEMP",
	573	"DCIN DET",
	574	"DCIN REM",
	575	"VBUS DET",
	576	"VBUS REM",
	577	"CHG END",
	578	};
	579
4b5edf78 FE	580	static int da9052_bat_irq_bits[] = {
	581	DA9052_IRQ_TBAT,
	582	DA9052_IRQ_DCIN,
	583	DA9052_IRQ_DCINREM,
	584	DA9052_IRQ_VBUS,
	585	DA9052_IRQ_VBUSREM,
	586	DA9052_IRQ_CHGEND,
	587	};
	588
c8afa640	589	static s32 da9052_bat_probe(struct platform_device *pdev)
ded7fc7b AJ	590	{
	591	struct da9052_pdata *pdata;
	592	struct da9052_battery *bat;
297d716f	593	struct power_supply_config psy_cfg = {};
ded7fc7b	594	int ret;
ded7fc7b AJ	595	int i;
ded7fc7b AJ	596
f0094958 JH	597	bat = devm_kzalloc(&pdev->dev, sizeof(struct da9052_battery),
f0094958 JH	598	GFP_KERNEL);
ded7fc7b AJ	599	if (!bat)
	600	return -ENOMEM;
	601
297d716f KK	602	psy_cfg.drv_data = bat;
297d716f KK	603
ded7fc7b	604	bat->da9052 = dev_get_drvdata(pdev->dev.parent);
ded7fc7b AJ	605	bat->charger_type = DA9052_NOCHARGER;
	606	bat->status = POWER_SUPPLY_STATUS_UNKNOWN;
	607	bat->health = POWER_SUPPLY_HEALTH_UNKNOWN;
	608	bat->nb.notifier_call = da9052_USB_current_notifier;
	609
	610	pdata = bat->da9052->dev->platform_data;
	611	if (pdata != NULL && pdata->use_for_apm)
297d716f	612	psy_desc.use_for_apm = pdata->use_for_apm;
ded7fc7b	613	else
297d716f	614	psy_desc.use_for_apm = 1;
ded7fc7b AJ	615
ded7fc7b AJ	616	for (i = 0; i < ARRAY_SIZE(da9052_bat_irqs); i++) {
4b5edf78 FE	617	ret = da9052_request_irq(bat->da9052,
	618	da9052_bat_irq_bits[i], da9052_bat_irqs[i],
	619	da9052_bat_irq, bat);
	620
ded7fc7b AJ	621	if (ret != 0) {
ded7fc7b AJ	622	dev_err(bat->da9052->dev,
4b5edf78 FE	623	"DA9052 failed to request %s IRQ: %d\n",
4b5edf78 FE	624	da9052_bat_irqs[i], ret);
ded7fc7b AJ	625	goto err;
	626	}
	627	}
	628
297d716f KK	629	bat->psy = power_supply_register(&pdev->dev, &psy_desc, &psy_cfg);
	630	if (IS_ERR(bat->psy)) {
	631	ret = PTR_ERR(bat->psy);
ded7fc7b	632	goto err;
297d716f	633	}
ded7fc7b	634
e1be8329	635	platform_set_drvdata(pdev, bat);
ded7fc7b AJ	636	return 0;
	637
	638	err:
4b5edf78 FE	639	while (--i >= 0)
	640	da9052_free_irq(bat->da9052, da9052_bat_irq_bits[i], bat);
	641
ded7fc7b AJ	642	return ret;
ded7fc7b AJ	643	}
415ec69f	644	static int da9052_bat_remove(struct platform_device *pdev)
ded7fc7b AJ	645	{
ded7fc7b AJ	646	int i;
ded7fc7b AJ	647	struct da9052_battery *bat = platform_get_drvdata(pdev);
ded7fc7b AJ	648
4b5edf78 FE	649	for (i = 0; i < ARRAY_SIZE(da9052_bat_irqs); i++)
	650	da9052_free_irq(bat->da9052, da9052_bat_irq_bits[i], bat);
	651
297d716f	652	power_supply_unregister(bat->psy);
ded7fc7b AJ	653
	654	return 0;
	655	}
	656
	657	static struct platform_driver da9052_bat_driver = {
	658	.probe = da9052_bat_probe,
28ea73f4	659	.remove = da9052_bat_remove,
ded7fc7b AJ	660	.driver = {
ded7fc7b AJ	661	.name = "da9052-bat",
ded7fc7b AJ	662	},
ded7fc7b AJ	663	};
534f5306	664	module_platform_driver(da9052_bat_driver);
ded7fc7b AJ	665
	666	MODULE_DESCRIPTION("DA9052 BAT Device Driver");
	667	MODULE_AUTHOR("David Dajun Chen <[email protected]>");
	668	MODULE_LICENSE("GPL");
	669	MODULE_ALIAS("platform:da9052-bat");