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|
/*
* max14577_charger.c - Battery charger driver for the Maxim 14577/77836
*
* Copyright (C) 2013,2014 Samsung Electronics
* Krzysztof Kozlowski <k.kozlowski@samsung.com>
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/mfd/max14577-private.h>
#include <linux/mfd/max14577.h>
struct max14577_charger {
struct device *dev;
struct max14577 *max14577;
struct power_supply charger;
unsigned int charging_state;
unsigned int battery_state;
struct max14577_charger_platform_data *pdata;
};
/*
* Helper function for mapping values of STATUS2/CHGTYP register on max14577
* and max77836 chipsets to enum maxim_muic_charger_type.
*/
static enum max14577_muic_charger_type maxim_get_charger_type(
enum maxim_device_type dev_type, u8 val) {
switch (val) {
case MAX14577_CHARGER_TYPE_NONE:
case MAX14577_CHARGER_TYPE_USB:
case MAX14577_CHARGER_TYPE_DOWNSTREAM_PORT:
case MAX14577_CHARGER_TYPE_DEDICATED_CHG:
case MAX14577_CHARGER_TYPE_SPECIAL_500MA:
case MAX14577_CHARGER_TYPE_SPECIAL_1A:
return val;
case MAX14577_CHARGER_TYPE_DEAD_BATTERY:
case MAX14577_CHARGER_TYPE_RESERVED:
if (dev_type == MAXIM_DEVICE_TYPE_MAX77836)
val |= 0x8;
return val;
default:
WARN_ONCE(1, "max14577: Unsupported chgtyp register value 0x%02x", val);
return val;
}
}
static int max14577_get_charger_state(struct max14577_charger *chg)
{
struct regmap *rmap = chg->max14577->regmap;
int state = POWER_SUPPLY_STATUS_DISCHARGING;
u8 reg_data;
/*
* Charging occurs only if:
* - CHGCTRL2/MBCHOSTEN == 1
* - STATUS2/CGMBC == 1
*
* TODO:
* - handle FULL after Top-off timer (EOC register may be off
* and the charger won't be charging although MBCHOSTEN is on)
* - handle properly dead-battery charging (respect timer)
* - handle timers (fast-charge and prequal) /MBCCHGERR/
*/
max14577_read_reg(rmap, MAX14577_CHG_REG_CHG_CTRL2, ®_data);
if ((reg_data & CHGCTRL2_MBCHOSTEN_MASK) == 0)
goto state_set;
max14577_read_reg(rmap, MAX14577_CHG_REG_STATUS3, ®_data);
if (reg_data & STATUS3_CGMBC_MASK) {
/* Charger or USB-cable is connected */
if (reg_data & STATUS3_EOC_MASK)
state = POWER_SUPPLY_STATUS_FULL;
else
state = POWER_SUPPLY_STATUS_CHARGING;
goto state_set;
}
state_set:
chg->charging_state = state;
return state;
}
/*
* Supported charge types:
* - POWER_SUPPLY_CHARGE_TYPE_NONE
* - POWER_SUPPLY_CHARGE_TYPE_FAST
*/
static int max14577_get_charge_type(struct max14577_charger *chg)
{
/*
* TODO: CHARGE_TYPE_TRICKLE (VCHGR_RC or EOC)?
* As spec says:
* [after reaching EOC interrupt]
* "When the battery is fully charged, the 30-minute (typ)
* top-off timer starts. The device continues to trickle
* charge the battery until the top-off timer runs out."
*/
if (max14577_get_charger_state(chg) == POWER_SUPPLY_STATUS_CHARGING)
return POWER_SUPPLY_CHARGE_TYPE_FAST;
return POWER_SUPPLY_CHARGE_TYPE_NONE;
}
static int max14577_get_online(struct max14577_charger *chg)
{
struct regmap *rmap = chg->max14577->regmap;
u8 reg_data;
enum max14577_muic_charger_type chg_type;
max14577_read_reg(rmap, MAX14577_MUIC_REG_STATUS2, ®_data);
reg_data = ((reg_data & STATUS2_CHGTYP_MASK) >> STATUS2_CHGTYP_SHIFT);
chg_type = maxim_get_charger_type(chg->max14577->dev_type, reg_data);
switch (chg_type) {
case MAX14577_CHARGER_TYPE_USB:
case MAX14577_CHARGER_TYPE_DEDICATED_CHG:
case MAX14577_CHARGER_TYPE_SPECIAL_500MA:
case MAX14577_CHARGER_TYPE_SPECIAL_1A:
case MAX14577_CHARGER_TYPE_DEAD_BATTERY:
case MAX77836_CHARGER_TYPE_SPECIAL_BIAS:
return 1;
case MAX14577_CHARGER_TYPE_NONE:
case MAX14577_CHARGER_TYPE_DOWNSTREAM_PORT:
case MAX14577_CHARGER_TYPE_RESERVED:
case MAX77836_CHARGER_TYPE_RESERVED:
default:
return 0;
}
}
/*
* Supported health statuses:
* - POWER_SUPPLY_HEALTH_DEAD
* - POWER_SUPPLY_HEALTH_OVERVOLTAGE
* - POWER_SUPPLY_HEALTH_GOOD
*/
static int max14577_get_battery_health(struct max14577_charger *chg)
{
struct regmap *rmap = chg->max14577->regmap;
int state = POWER_SUPPLY_HEALTH_GOOD;
u8 reg_data;
enum max14577_muic_charger_type chg_type;
max14577_read_reg(rmap, MAX14577_MUIC_REG_STATUS2, ®_data);
reg_data = ((reg_data & STATUS2_CHGTYP_MASK) >> STATUS2_CHGTYP_SHIFT);
chg_type = maxim_get_charger_type(chg->max14577->dev_type, reg_data);
if (chg_type == MAX14577_CHARGER_TYPE_DEAD_BATTERY) {
state = POWER_SUPPLY_HEALTH_DEAD;
goto state_set;
}
max14577_read_reg(rmap, MAX14577_CHG_REG_STATUS3, ®_data);
if (reg_data & STATUS3_OVP_MASK) {
state = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
goto state_set;
}
state_set:
chg->battery_state = state;
return state;
}
/*
* Always returns 1.
* The max14577 chip doesn't report any status of battery presence.
* Lets assume that it will always be used with some battery.
*/
static int max14577_get_present(struct max14577_charger *chg)
{
return 1;
}
static int max14577_set_fast_charge_timer(struct max14577_charger *chg,
unsigned long hours)
{
u8 reg_data;
switch (hours) {
case 5 ... 7:
reg_data = hours - 3;
break;
case 0:
/* Disable */
reg_data = 0x7;
break;
default:
dev_err(chg->dev, "Wrong value for Fast-Charge Timer: %lu\n",
hours);
return -EINVAL;
}
reg_data <<= CHGCTRL1_TCHW_SHIFT;
return max14577_update_reg(chg->max14577->regmap,
MAX14577_REG_CHGCTRL1, CHGCTRL1_TCHW_MASK, reg_data);
}
static int max14577_init_constant_voltage(struct max14577_charger *chg,
unsigned int uvolt)
{
u8 reg_data;
if (uvolt < MAXIM_CHARGER_CONSTANT_VOLTAGE_MIN ||
uvolt > MAXIM_CHARGER_CONSTANT_VOLTAGE_MAX)
return -EINVAL;
if (uvolt == 4200000)
reg_data = 0x0;
else if (uvolt == MAXIM_CHARGER_CONSTANT_VOLTAGE_MAX)
reg_data = 0x1f;
else if (uvolt <= 4280000) {
unsigned int val = uvolt;
val -= MAXIM_CHARGER_CONSTANT_VOLTAGE_MIN;
val /= MAXIM_CHARGER_CONSTANT_VOLTAGE_STEP;
if (uvolt <= 4180000)
reg_data = 0x1 + val;
else
reg_data = val; /* Fix for gap between 4.18V and 4.22V */
} else
return -EINVAL;
reg_data <<= CHGCTRL3_MBCCVWRC_SHIFT;
return max14577_write_reg(chg->max14577->regmap,
MAX14577_CHG_REG_CHG_CTRL3, reg_data);
}
static int max14577_init_eoc(struct max14577_charger *chg,
unsigned int uamp)
{
unsigned int current_bits = 0xf;
u8 reg_data;
switch (chg->max14577->dev_type) {
case MAXIM_DEVICE_TYPE_MAX77836:
if (uamp < 5000)
return -EINVAL; /* Requested current is too low */
if (uamp >= 7500 && uamp < 10000)
current_bits = 0x0;
else if (uamp <= 50000) {
/* <5000, 7499> and <10000, 50000> */
current_bits = uamp / 5000;
} else {
uamp = min(uamp, 100000U) - 50000U
|