path: root/drivers/power/88pm860x_battery.c

/*
 * Battery driver for Marvell 88PM860x PMIC
 *
 * Copyright (c) 2012 Marvell International Ltd.
 * Author:	Jett Zhou <jtzhou@marvell.com>
 *		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/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/mutex.h>
#include <linux/string.h>
#include <linux/power_supply.h>
#include <linux/mfd/88pm860x.h>
#include <linux/delay.h>

/* bit definitions of Status Query Interface 2 */
#define STATUS2_CHG			(1 << 2)
#define STATUS2_BAT			(1 << 3)
#define STATUS2_VBUS			(1 << 4)

/* bit definitions of Measurement Enable 1 Register */
#define MEAS1_TINT			(1 << 3)
#define MEAS1_GP1			(1 << 5)

/* bit definitions of Measurement Enable 3 Register */
#define MEAS3_IBAT			(1 << 0)
#define MEAS3_BAT_DET			(1 << 1)
#define MEAS3_CC			(1 << 2)

/* bit definitions of Measurement Off Time Register */
#define MEAS_OFF_SLEEP_EN		(1 << 1)

/* bit definitions of GPADC Bias Current 2 Register */
#define GPBIAS2_GPADC1_SET		(2 << 4)
/* GPADC1 Bias Current value in uA unit */
#define GPBIAS2_GPADC1_UA		((GPBIAS2_GPADC1_SET >> 4) * 5 + 1)

/* bit definitions of GPADC Misc 1 Register */
#define GPMISC1_GPADC_EN		(1 << 0)

/* bit definitions of Charger Control 6 Register */
#define CC6_BAT_DET_GPADC1		1

/* bit definitions of Coulomb Counter Reading Register */
#define CCNT_AVG_SEL			(4 << 3)

/* bit definitions of RTC miscellaneous Register1 */
#define RTC_SOC_5LSB		(0x1F << 3)

/* bit definitions of RTC Register1 */
#define RTC_SOC_3MSB		(0x7)

/* bit definitions of Power up Log register */
#define BAT_WU_LOG			(1<<6)

/* coulomb counter index */
#define CCNT_POS1			0
#define CCNT_POS2			1
#define CCNT_NEG1			2
#define CCNT_NEG2			3
#define CCNT_SPOS			4
#define CCNT_SNEG			5

/* OCV -- Open Circuit Voltage */
#define OCV_MODE_ACTIVE			0
#define OCV_MODE_SLEEP			1

/* Vbat range of CC for measuring Rbat */
#define LOW_BAT_THRESHOLD		3600
#define VBATT_RESISTOR_MIN		3800
#define VBATT_RESISTOR_MAX		4100

/* TBAT for batt, TINT for chip itself */
#define PM860X_TEMP_TINT		(0)
#define PM860X_TEMP_TBAT		(1)

/*
 * Battery temperature based on NTC resistor, defined
 * corresponding resistor value  -- Ohm / C degeree.
 */
#define TBAT_NEG_25D		127773	/* -25 */
#define TBAT_NEG_10D		54564	/* -10 */
#define TBAT_0D			32330	/* 0 */
#define TBAT_10D		19785	/* 10 */
#define TBAT_20D		12468	/* 20 */
#define TBAT_30D		8072	/* 30 */
#define TBAT_40D		5356	/* 40 */

struct pm860x_battery_info {
	struct pm860x_chip *chip;
	struct i2c_client *i2c;
	struct device *dev;

	struct power_supply battery;
	struct mutex lock;
	int status;
	int irq_cc;
	int irq_batt;
	int max_capacity;
	int resistor;		/* Battery Internal Resistor */
	int last_capacity;
	int start_soc;
	unsigned present:1;
	unsigned temp_type:1;	/* TINT or TBAT */
};

struct ccnt {
	unsigned long long int pos;
	unsigned long long int neg;
	unsigned int spos;
	unsigned int sneg;

	int total_chg;		/* mAh(3.6C) */
	int total_dischg;	/* mAh(3.6C) */
};

/*
 * State of Charge.
 * The first number is mAh(=3.6C), and the second number is percent point.
 */
static int array_soc[][2] = {
	{4170, 100}, {4154, 99}, {4136, 98}, {4122, 97}, {4107, 96},
	{4102, 95}, {4088, 94}, {4081, 93}, {4070, 92}, {4060, 91},
	{4053, 90}, {4044, 89}, {4035, 88}, {4028, 87}, {4019, 86},
	{4013, 85}, {4006, 84}, {3995, 83}, {3987, 82}, {3982, 81},
	{3976, 80}, {3968, 79}, {3962, 78}, {3954, 77}, {3946, 76},
	{3941, 75}, {3934, 74}, {3929, 73}, {3922, 72}, {3916, 71},
	{3910, 70}, {3904, 69}, {3898, 68}, {3892, 67}, {3887, 66},
	{3880, 65}, {3874, 64}, {3868, 63}, {3862, 62}, {3854, 61},
	{3849, 60}, {3843, 59}, {3840, 58}, {3833, 57}, {3829, 56},
	{3824, 55}, {3818, 54}, {3815, 53}, {3810, 52}, {3808, 51},
	{3804, 50}, {3801, 49}, {3798, 48}, {3796, 47}, {3792, 46},
	{3789, 45}, {3785, 44}, {3784, 43}, {3782, 42}, {3780, 41},
	{3777, 40}, {3776, 39}, {3774, 38}, {3772, 37}, {3771, 36},
	{3769, 35}, {3768, 34}, {3764, 33},