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/*
* 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/of.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 = -
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