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linux/drivers/power/max77693_charger.c
Krzysztof Kozlowski 61b305cd2a drivers: max77693: Move state container to common header 
This prepares for merging some of the drivers between max77693 and
max77843 so the child MFD driver can be attached to any parent MFD main
driver.

Move the state container to common header file. Additionally add
consistent 'i2c' prefixes to its members (of 'struct i2c_client' type).

Signed-off-by: Krzysztof Kozlowski <k.kozlowski.k@gmail.com>
Acked-by: Sebastian Reichel <sre@kernel.org>
Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Acked-by: Lee Jones <lee.jones@linaro.org>
Acked-by: Chanwoo Choi <cw00.choi@samsung.com>
Acked-by: Jacek Anaszewski <j.anaszewski@samsung.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2015-07-16 21:39:30 +01:00

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/*
* max77693_charger.c - Battery charger driver for the Maxim 77693
*
* Copyright (C) 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/regmap.h>
#include <linux/mfd/max77693.h>
#include <linux/mfd/max77693-common.h>
#include <linux/mfd/max77693-private.h>
#define MAX77693_CHARGER_NAME "max77693-charger"
static const char *max77693_charger_model = "MAX77693";
static const char *max77693_charger_manufacturer = "Maxim Integrated";
struct max77693_charger {
struct device *dev;
struct max77693_dev *max77693;
struct power_supply *charger;
u32 constant_volt;
u32 min_system_volt;
u32 thermal_regulation_temp;
u32 batttery_overcurrent;
u32 charge_input_threshold_volt;
};
static int max77693_get_charger_state(struct regmap *regmap, int *val)
{
int ret;
unsigned int data;
ret = regmap_read(regmap, MAX77693_CHG_REG_CHG_DETAILS_01, &data);
if (ret < 0)
return ret;
data &= CHG_DETAILS_01_CHG_MASK;
data >>= CHG_DETAILS_01_CHG_SHIFT;
switch (data) {
case MAX77693_CHARGING_PREQUALIFICATION:
case MAX77693_CHARGING_FAST_CONST_CURRENT:
case MAX77693_CHARGING_FAST_CONST_VOLTAGE:
case MAX77693_CHARGING_TOP_OFF:
/* In high temp the charging current is reduced, but still charging */
case MAX77693_CHARGING_HIGH_TEMP:
*val = POWER_SUPPLY_STATUS_CHARGING;
break;
case MAX77693_CHARGING_DONE:
*val = POWER_SUPPLY_STATUS_FULL;
break;
case MAX77693_CHARGING_TIMER_EXPIRED:
case MAX77693_CHARGING_THERMISTOR_SUSPEND:
*val = POWER_SUPPLY_STATUS_NOT_CHARGING;
break;
case MAX77693_CHARGING_OFF:
case MAX77693_CHARGING_OVER_TEMP:
case MAX77693_CHARGING_WATCHDOG_EXPIRED:
*val = POWER_SUPPLY_STATUS_DISCHARGING;
break;
case MAX77693_CHARGING_RESERVED:
default:
*val = POWER_SUPPLY_STATUS_UNKNOWN;
}
return 0;
}
static int max77693_get_charge_type(struct regmap *regmap, int *val)
{
int ret;
unsigned int data;
ret = regmap_read(regmap, MAX77693_CHG_REG_CHG_DETAILS_01, &data);
if (ret < 0)
return ret;
data &= CHG_DETAILS_01_CHG_MASK;
data >>= CHG_DETAILS_01_CHG_SHIFT;
switch (data) {
case MAX77693_CHARGING_PREQUALIFICATION:
/*
* Top-off: trickle or fast? In top-off the current varies between
* 100 and 250 mA. It is higher than prequalification current.
*/
case MAX77693_CHARGING_TOP_OFF:
*val = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
break;
case MAX77693_CHARGING_FAST_CONST_CURRENT:
case MAX77693_CHARGING_FAST_CONST_VOLTAGE:
/* In high temp the charging current is reduced, but still charging */
case MAX77693_CHARGING_HIGH_TEMP:
*val = POWER_SUPPLY_CHARGE_TYPE_FAST;
break;
case MAX77693_CHARGING_DONE:
case MAX77693_CHARGING_TIMER_EXPIRED:
case MAX77693_CHARGING_THERMISTOR_SUSPEND:
case MAX77693_CHARGING_OFF:
case MAX77693_CHARGING_OVER_TEMP:
case MAX77693_CHARGING_WATCHDOG_EXPIRED:
*val = POWER_SUPPLY_CHARGE_TYPE_NONE;
break;
case MAX77693_CHARGING_RESERVED:
default:
*val = POWER_SUPPLY_CHARGE_TYPE_UNKNOWN;
}
return 0;
}
/*
* Supported health statuses:
* - POWER_SUPPLY_HEALTH_DEAD
* - POWER_SUPPLY_HEALTH_GOOD
* - POWER_SUPPLY_HEALTH_OVERVOLTAGE
* - POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE
* - POWER_SUPPLY_HEALTH_UNKNOWN
* - POWER_SUPPLY_HEALTH_UNSPEC_FAILURE
*/
static int max77693_get_battery_health(struct regmap *regmap, int *val)
{
int ret;
unsigned int data;
ret = regmap_read(regmap, MAX77693_CHG_REG_CHG_DETAILS_01, &data);
if (ret < 0)
return ret;
data &= CHG_DETAILS_01_BAT_MASK;
data >>= CHG_DETAILS_01_BAT_SHIFT;
switch (data) {
case MAX77693_BATTERY_NOBAT:
*val = POWER_SUPPLY_HEALTH_DEAD;
break;
case MAX77693_BATTERY_PREQUALIFICATION:
case MAX77693_BATTERY_GOOD:
case MAX77693_BATTERY_LOWVOLTAGE:
*val = POWER_SUPPLY_HEALTH_GOOD;
break;
case MAX77693_BATTERY_TIMER_EXPIRED:
/*
* Took longer to charge than expected, charging suspended.
* Damaged battery?
*/
*val = POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE;
break;
case MAX77693_BATTERY_OVERVOLTAGE:
*val = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
break;
case MAX77693_BATTERY_OVERCURRENT:
*val = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
break;
case MAX77693_BATTERY_RESERVED:
default:
*val = POWER_SUPPLY_HEALTH_UNKNOWN;
break;
}
return 0;
}
static int max77693_get_present(struct regmap *regmap, int *val)
{
unsigned int data;
int ret;
/*
* Read CHG_INT_OK register. High DETBAT bit here should be
* equal to value 0x0 in CHG_DETAILS_01/BAT field.
*/
ret = regmap_read(regmap, MAX77693_CHG_REG_CHG_INT_OK, &data);
if (ret < 0)
return ret;
*val = (data & CHG_INT_OK_DETBAT_MASK) ? 0 : 1;
return 0;
}
static int max77693_get_online(struct regmap *regmap, int *val)
{
unsigned int data;
int ret;
ret = regmap_read(regmap, MAX77693_CHG_REG_CHG_INT_OK, &data);
if (ret < 0)
return ret;
*val = (data & CHG_INT_OK_CHGIN_MASK) ? 1 : 0;
return 0;
}
static enum power_supply_property max77693_charger_props[] = {
POWER_SUPPLY_PROP_STATUS,
POWER_SUPPLY_PROP_CHARGE_TYPE,
POWER_SUPPLY_PROP_HEALTH,
POWER_SUPPLY_PROP_PRESENT,
POWER_SUPPLY_PROP_ONLINE,
POWER_SUPPLY_PROP_MODEL_NAME,
POWER_SUPPLY_PROP_MANUFACTURER,
};
static int max77693_charger_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
struct max77693_charger *chg = power_supply_get_drvdata(psy);
struct regmap *regmap = chg->max77693->regmap;
int ret = 0;
switch (psp) {
case POWER_SUPPLY_PROP_STATUS:
ret = max77693_get_charger_state(regmap, &val->intval);
break;
case POWER_SUPPLY_PROP_CHARGE_TYPE:
ret = max77693_get_charge_type(regmap, &val->intval);
break;
case POWER_SUPPLY_PROP_HEALTH:
ret = max77693_get_battery_health(regmap, &val->intval);
break;
case POWER_SUPPLY_PROP_PRESENT:
ret = max77693_get_present(regmap, &val->intval);
break;
case POWER_SUPPLY_PROP_ONLINE:
ret = max77693_get_online(regmap, &val->intval);
break;
case POWER_SUPPLY_PROP_MODEL_NAME:
val->strval = max77693_charger_model;
break;
case POWER_SUPPLY_PROP_MANUFACTURER:
val->strval = max77693_charger_manufacturer;
break;
default:
return -EINVAL;
}
return ret;
}
static const struct power_supply_desc max77693_charger_desc = {
.name = MAX77693_CHARGER_NAME,
.type = POWER_SUPPLY_TYPE_BATTERY,
.properties = max77693_charger_props,
.num_properties = ARRAY_SIZE(max77693_charger_props),
.get_property = max77693_charger_get_property,
};
static ssize_t device_attr_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count,
int (*fn)(struct max77693_charger *, unsigned long))
{
struct max77693_charger *chg = dev_get_drvdata(dev);
unsigned long val;
int ret;
ret = kstrtoul(buf, 10, &val);
if (ret)
return ret;
ret = fn(chg, val);
if (ret)
return ret;
return count;
}
static ssize_t fast_charge_timer_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct max77693_charger *chg = dev_get_drvdata(dev);
unsigned int data, val;
int ret;
ret = regmap_read(chg->max77693->regmap, MAX77693_CHG_REG_CHG_CNFG_01,
&data);
if (ret < 0)
return ret;
data &= CHG_CNFG_01_FCHGTIME_MASK;
data >>= CHG_CNFG_01_FCHGTIME_SHIFT;
switch (data) {
case 0x1 ... 0x7:
/* Starting from 4 hours, step by 2 hours */
val = 4 + (data - 1) * 2;
break;
case 0x0:
default:
val = 0;
break;
}
return scnprintf(buf, PAGE_SIZE, "%u\n", val);
}
static int max77693_set_fast_charge_timer(struct max77693_charger *chg,
unsigned long hours)
{
unsigned int data;
/*
* 0x00 - disable
* 0x01 - 4h
* 0x02 - 6h
* ...
* 0x07 - 16h
* Round down odd values.
*/
switch (hours) {
case 4 ... 16:
data = (hours - 4) / 2 + 1;
break;
case 0:
/* Disable */
data = 0;
break;
default:
return -EINVAL;
}
data <<= CHG_CNFG_01_FCHGTIME_SHIFT;
return regmap_update_bits(chg->max77693->regmap,
MAX77693_CHG_REG_CHG_CNFG_01,
CHG_CNFG_01_FCHGTIME_MASK, data);
}
static ssize_t fast_charge_timer_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
{
return device_attr_store(dev, attr, buf, count,
max77693_set_fast_charge_timer);
}
static ssize_t top_off_threshold_current_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct max77693_charger *chg = dev_get_drvdata(dev);
unsigned int data, val;
int ret;
ret = regmap_read(chg->max77693->regmap, MAX77693_CHG_REG_CHG_CNFG_03,
&data);
if (ret < 0)
return ret;
data &= CHG_CNFG_03_TOITH_MASK;
data >>= CHG_CNFG_03_TOITH_SHIFT;
if (data <= 0x04)
val = 100000 + data * 25000;
else
val = data * 50000;
return scnprintf(buf, PAGE_SIZE, "%u\n", val);
}
static int max77693_set_top_off_threshold_current(struct max77693_charger *chg,
unsigned long uamp)
{
unsigned int data;
if (uamp < 100000 || uamp > 350000)
return -EINVAL;
if (uamp <= 200000)
data = (uamp - 100000) / 25000;
else
/* (200000, 350000> */
data = uamp / 50000;
data <<= CHG_CNFG_03_TOITH_SHIFT;
return regmap_update_bits(chg->max77693->regmap,
MAX77693_CHG_REG_CHG_CNFG_03,
CHG_CNFG_03_TOITH_MASK, data);
}
static ssize_t top_off_threshold_current_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
{
return device_attr_store(dev, attr, buf, count,
max77693_set_top_off_threshold_current);
}
static ssize_t top_off_timer_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct max77693_charger *chg = dev_get_drvdata(dev);
unsigned int data, val;
int ret;
ret = regmap_read(chg->max77693->regmap, MAX77693_CHG_REG_CHG_CNFG_03,
&data);
if (ret < 0)
return ret;
data &= CHG_CNFG_03_TOTIME_MASK;
data >>= CHG_CNFG_03_TOTIME_SHIFT;
val = data * 10;
return scnprintf(buf, PAGE_SIZE, "%u\n", val);
}
static int max77693_set_top_off_timer(struct max77693_charger *chg,
unsigned long minutes)
{
unsigned int data;
if (minutes > 70)
return -EINVAL;
data = minutes / 10;
data <<= CHG_CNFG_03_TOTIME_SHIFT;
return regmap_update_bits(chg->max77693->regmap,
MAX77693_CHG_REG_CHG_CNFG_03,
CHG_CNFG_03_TOTIME_MASK, data);
}
static ssize_t top_off_timer_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
{
return device_attr_store(dev, attr, buf, count,
max77693_set_top_off_timer);
}
static DEVICE_ATTR_RW(fast_charge_timer);
static DEVICE_ATTR_RW(top_off_threshold_current);
static DEVICE_ATTR_RW(top_off_timer);
static int max77693_set_constant_volt(struct max77693_charger *chg,
unsigned int uvolt)
{
unsigned int data;
/*
* 0x00 - 3.650 V
* 0x01 - 3.675 V
* ...
* 0x1b - 4.325 V
* 0x1c - 4.340 V
* 0x1d - 4.350 V
* 0x1e - 4.375 V
* 0x1f - 4.400 V
*/
if (uvolt >= 3650000 && uvolt < 4340000)
data = (uvolt - 3650000) / 25000;
else if (uvolt >= 4340000 && uvolt < 4350000)
data = 0x1c;
else if (uvolt >= 4350000 && uvolt <= 4400000)
data = 0x1d + (uvolt - 4350000) / 25000;
else {
dev_err(chg->dev, "Wrong value for charging constant voltage\n");
return -EINVAL;
}
data <<= CHG_CNFG_04_CHGCVPRM_SHIFT;
dev_dbg(chg->dev, "Charging constant voltage: %u (0x%x)\n", uvolt,
data);
return regmap_update_bits(chg->max77693->regmap,
MAX77693_CHG_REG_CHG_CNFG_04,
CHG_CNFG_04_CHGCVPRM_MASK, data);
}
static int max77693_set_min_system_volt(struct max77693_charger *chg,
unsigned int uvolt)
{
unsigned int data;
if (uvolt < 3000000 || uvolt > 3700000) {
dev_err(chg->dev, "Wrong value for minimum system regulation voltage\n");
return -EINVAL;
}
data = (uvolt - 3000000) / 100000;
data <<= CHG_CNFG_04_MINVSYS_SHIFT;
dev_dbg(chg->dev, "Minimum system regulation voltage: %u (0x%x)\n",
uvolt, data);
return regmap_update_bits(chg->max77693->regmap,
MAX77693_CHG_REG_CHG_CNFG_04,
CHG_CNFG_04_MINVSYS_MASK, data);
}
static int max77693_set_thermal_regulation_temp(struct max77693_charger *chg,
unsigned int cels)
{
unsigned int data;
switch (cels) {
case 70:
case 85:
case 100:
case 115:
data = (cels - 70) / 15;
break;
default:
dev_err(chg->dev, "Wrong value for thermal regulation loop temperature\n");
return -EINVAL;
}
data <<= CHG_CNFG_07_REGTEMP_SHIFT;
dev_dbg(chg->dev, "Thermal regulation loop temperature: %u (0x%x)\n",
cels, data);
return regmap_update_bits(chg->max77693->regmap,
MAX77693_CHG_REG_CHG_CNFG_07,
CHG_CNFG_07_REGTEMP_MASK, data);
}
static int max77693_set_batttery_overcurrent(struct max77693_charger *chg,
unsigned int uamp)
{
unsigned int data;
if (uamp && (uamp < 2000000 || uamp > 3500000)) {
dev_err(chg->dev, "Wrong value for battery overcurrent\n");
return -EINVAL;
}
if (uamp)
data = ((uamp - 2000000) / 250000) + 1;
else
data = 0; /* disable */
data <<= CHG_CNFG_12_B2SOVRC_SHIFT;
dev_dbg(chg->dev, "Battery overcurrent: %u (0x%x)\n", uamp, data);
return regmap_update_bits(chg->max77693->regmap,
MAX77693_CHG_REG_CHG_CNFG_12,
CHG_CNFG_12_B2SOVRC_MASK, data);
}
static int max77693_set_charge_input_threshold_volt(struct max77693_charger *chg,
unsigned int uvolt)
{
unsigned int data;
switch (uvolt) {
case 4300000:
data = 0x0;
break;
case 4700000:
case 4800000:
case 4900000:
data = (uvolt - 4700000) / 100000;
default:
dev_err(chg->dev, "Wrong value for charge input voltage regulation threshold\n");
return -EINVAL;
}
data <<= CHG_CNFG_12_VCHGINREG_SHIFT;
dev_dbg(chg->dev, "Charge input voltage regulation threshold: %u (0x%x)\n",
uvolt, data);
return regmap_update_bits(chg->max77693->regmap,
MAX77693_CHG_REG_CHG_CNFG_12,
CHG_CNFG_12_VCHGINREG_MASK, data);
}
/*
* Sets charger registers to proper and safe default values.
*/
static int max77693_reg_init(struct max77693_charger *chg)
{
int ret;
unsigned int data;
/* Unlock charger register protection */
data = (0x3 << CHG_CNFG_06_CHGPROT_SHIFT);
ret = regmap_update_bits(chg->max77693->regmap,
MAX77693_CHG_REG_CHG_CNFG_06,
CHG_CNFG_06_CHGPROT_MASK, data);
if (ret) {
dev_err(chg->dev, "Error unlocking registers: %d\n", ret);
return ret;
}
ret = max77693_set_fast_charge_timer(chg, DEFAULT_FAST_CHARGE_TIMER);
if (ret)
return ret;
ret = max77693_set_top_off_threshold_current(chg,
DEFAULT_TOP_OFF_THRESHOLD_CURRENT);
if (ret)
return ret;
ret = max77693_set_top_off_timer(chg, DEFAULT_TOP_OFF_TIMER);
if (ret)
return ret;
ret = max77693_set_constant_volt(chg, chg->constant_volt);
if (ret)
return ret;
ret = max77693_set_min_system_volt(chg, chg->min_system_volt);
if (ret)
return ret;
ret = max77693_set_thermal_regulation_temp(chg,
chg->thermal_regulation_temp);
if (ret)
return ret;
ret = max77693_set_batttery_overcurrent(chg, chg->batttery_overcurrent);
if (ret)
return ret;
return max77693_set_charge_input_threshold_volt(chg,
chg->charge_input_threshold_volt);
}
#ifdef CONFIG_OF
static int max77693_dt_init(struct device *dev, struct max77693_charger *chg)
{
struct device_node *np = dev->of_node;
if (!np) {
dev_err(dev, "no charger OF node\n");
return -EINVAL;
}
if (of_property_read_u32(np, "maxim,constant-microvolt",
&chg->constant_volt))
chg->constant_volt = DEFAULT_CONSTANT_VOLT;
if (of_property_read_u32(np, "maxim,min-system-microvolt",
&chg->min_system_volt))
chg->min_system_volt = DEFAULT_MIN_SYSTEM_VOLT;
if (of_property_read_u32(np, "maxim,thermal-regulation-celsius",
&chg->thermal_regulation_temp))
chg->thermal_regulation_temp = DEFAULT_THERMAL_REGULATION_TEMP;
if (of_property_read_u32(np, "maxim,battery-overcurrent-microamp",
&chg->batttery_overcurrent))
chg->batttery_overcurrent = DEFAULT_BATTERY_OVERCURRENT;
if (of_property_read_u32(np, "maxim,charge-input-threshold-microvolt",
&chg->charge_input_threshold_volt))
chg->charge_input_threshold_volt =
DEFAULT_CHARGER_INPUT_THRESHOLD_VOLT;
return 0;
}
#else /* CONFIG_OF */
static int max77693_dt_init(struct device *dev, struct max77693_charger *chg)
{
return 0;
}
#endif /* CONFIG_OF */
static int max77693_charger_probe(struct platform_device *pdev)
{
struct max77693_charger *chg;
struct power_supply_config psy_cfg = {};
struct max77693_dev *max77693 = dev_get_drvdata(pdev->dev.parent);
int ret;
chg = devm_kzalloc(&pdev->dev, sizeof(*chg), GFP_KERNEL);
if (!chg)
return -ENOMEM;
platform_set_drvdata(pdev, chg);
chg->dev = &pdev->dev;
chg->max77693 = max77693;
ret = max77693_dt_init(&pdev->dev, chg);
if (ret)
return ret;
ret = max77693_reg_init(chg);
if (ret)
return ret;
psy_cfg.drv_data = chg;
ret = device_create_file(&pdev->dev, &dev_attr_fast_charge_timer);
if (ret) {
dev_err(&pdev->dev, "failed: create fast charge timer sysfs entry\n");
goto err;
}
ret = device_create_file(&pdev->dev,
&dev_attr_top_off_threshold_current);
if (ret) {
dev_err(&pdev->dev, "failed: create top off current sysfs entry\n");
goto err;
}
ret = device_create_file(&pdev->dev, &dev_attr_top_off_timer);
if (ret) {
dev_err(&pdev->dev, "failed: create top off timer sysfs entry\n");
goto err;
}
chg->charger = power_supply_register(&pdev->dev,
&max77693_charger_desc,
&psy_cfg);
if (IS_ERR(chg->charger)) {
dev_err(&pdev->dev, "failed: power supply register\n");
ret = PTR_ERR(chg->charger);
goto err;
}
return 0;
err:
device_remove_file(&pdev->dev, &dev_attr_top_off_timer);
device_remove_file(&pdev->dev, &dev_attr_top_off_threshold_current);
device_remove_file(&pdev->dev, &dev_attr_fast_charge_timer);
return ret;
}
static int max77693_charger_remove(struct platform_device *pdev)
{
struct max77693_charger *chg = platform_get_drvdata(pdev);
device_remove_file(&pdev->dev, &dev_attr_top_off_timer);
device_remove_file(&pdev->dev, &dev_attr_top_off_threshold_current);
device_remove_file(&pdev->dev, &dev_attr_fast_charge_timer);
power_supply_unregister(chg->charger);
return 0;
}
static const struct platform_device_id max77693_charger_id[] = {
{ "max77693-charger", 0, },
{ }
};
MODULE_DEVICE_TABLE(platform, max77693_charger_id);
static struct platform_driver max77693_charger_driver = {
.driver = {
.name = "max77693-charger",
},
.probe = max77693_charger_probe,
.remove = max77693_charger_remove,
.id_table = max77693_charger_id,
};
module_platform_driver(max77693_charger_driver);
MODULE_AUTHOR("Krzysztof Kozlowski <k.kozlowski@samsung.com>");
MODULE_DESCRIPTION("Maxim 77693 charger driver");
MODULE_LICENSE("GPL");
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