mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-30 14:46:47 +07:00
55e6470120
MAX14577 chip is a multi-function device which includes MUIC, charger and voltage regulator. The driver is located in drivers/mfd. This patch supports battery charging control of MAX14577 chip and provides power supply class information to userspace. Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com> Signed-off-by: Anton Vorontsov <anton@enomsg.org>
312 lines
8.7 KiB
C
312 lines
8.7 KiB
C
/*
|
|
* Battery charger driver for the Maxim 14577
|
|
*
|
|
* Copyright (C) 2013 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>
|
|
|
|
struct max14577_charger {
|
|
struct device *dev;
|
|
struct max14577 *max14577;
|
|
struct power_supply charger;
|
|
|
|
unsigned int charging_state;
|
|
unsigned int battery_state;
|
|
};
|
|
|
|
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;
|
|
|
|
max14577_read_reg(rmap, MAX14577_MUIC_REG_STATUS2, ®_data);
|
|
reg_data = ((reg_data & STATUS2_CHGTYP_MASK) >> STATUS2_CHGTYP_SHIFT);
|
|
switch (reg_data) {
|
|
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:
|
|
return 1;
|
|
case MAX14577_CHARGER_TYPE_NONE:
|
|
case MAX14577_CHARGER_TYPE_DOWNSTREAM_PORT:
|
|
case MAX14577_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;
|
|
|
|
max14577_read_reg(rmap, MAX14577_MUIC_REG_STATUS2, ®_data);
|
|
reg_data = ((reg_data & STATUS2_CHGTYP_MASK) >> STATUS2_CHGTYP_SHIFT);
|
|
if (reg_data == 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;
|
|
}
|
|
|
|
/*
|
|
* Sets charger registers to proper and safe default values.
|
|
* Some of these values are equal to defaults in MAX14577E
|
|
* data sheet but there are minor differences.
|
|
*/
|
|
static void max14577_charger_reg_init(struct max14577_charger *chg)
|
|
{
|
|
struct regmap *rmap = chg->max14577->regmap;
|
|
u8 reg_data;
|
|
|
|
/*
|
|
* Charger-Type Manual Detection, default off (set CHGTYPMAN to 0)
|
|
* Charger-Detection Enable, default on (set CHGDETEN to 1)
|
|
* Combined mask of CHGDETEN and CHGTYPMAN will zero the CHGTYPMAN bit
|
|
*/
|
|
reg_data = 0x1 << CDETCTRL1_CHGDETEN_SHIFT;
|
|
max14577_update_reg(rmap, MAX14577_REG_CDETCTRL1,
|
|
CDETCTRL1_CHGDETEN_MASK | CDETCTRL1_CHGTYPMAN_MASK,
|
|
reg_data);
|
|
|
|
/* Battery Fast-Charge Timer, from SM-V700: 6hrs */
|
|
reg_data = 0x3 << CHGCTRL1_TCHW_SHIFT;
|
|
max14577_write_reg(rmap, MAX14577_REG_CHGCTRL1, reg_data);
|
|
|
|
/*
|
|
* Wall-Adapter Rapid Charge, default on
|
|
* Battery-Charger, default on
|
|
*/
|
|
reg_data = 0x1 << CHGCTRL2_VCHGR_RC_SHIFT;
|
|
reg_data |= 0x1 << CHGCTRL2_MBCHOSTEN_SHIFT;
|
|
max14577_write_reg(rmap, MAX14577_REG_CHGCTRL2, reg_data);
|
|
|
|
/* Battery-Charger Constant Voltage (CV) Mode, from SM-V700: 4.35V */
|
|
reg_data = 0xf << CHGCTRL3_MBCCVWRC_SHIFT;
|
|
max14577_write_reg(rmap, MAX14577_REG_CHGCTRL3, reg_data);
|
|
|
|
/*
|
|
* Fast Battery-Charge Current Low, default 200-950mA
|
|
* Fast Battery-Charge Current High, from SM-V700: 450mA
|
|
*/
|
|
reg_data = 0x1 << CHGCTRL4_MBCICHWRCL_SHIFT;
|
|
reg_data |= 0x5 << CHGCTRL4_MBCICHWRCH_SHIFT;
|
|
max14577_write_reg(rmap, MAX14577_REG_CHGCTRL4, reg_data);
|
|
|
|
/* End-of-Charge Current, from SM-V700: 50mA */
|
|
reg_data = 0x0 << CHGCTRL5_EOCS_SHIFT;
|
|
max14577_write_reg(rmap, MAX14577_REG_CHGCTRL5, reg_data);
|
|
|
|
/* Auto Charging Stop, default off */
|
|
reg_data = 0x0 << CHGCTRL6_AUTOSTOP_SHIFT;
|
|
max14577_write_reg(rmap, MAX14577_REG_CHGCTRL6, reg_data);
|
|
|
|
/* Overvoltage-Protection Threshold, from SM-V700: 6.5V */
|
|
reg_data = 0x2 << CHGCTRL7_OTPCGHCVS_SHIFT;
|
|
max14577_write_reg(rmap, MAX14577_REG_CHGCTRL7, reg_data);
|
|
}
|
|
|
|
/* Support property from charger */
|
|
static enum power_supply_property max14577_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 const char *model_name = "MAX14577";
|
|
static const char *manufacturer = "Maxim Integrated";
|
|
|
|
static int max14577_charger_get_property(struct power_supply *psy,
|
|
enum power_supply_property psp,
|
|
union power_supply_propval *val)
|
|
{
|
|
struct max14577_charger *chg = container_of(psy,
|
|
struct max14577_charger,
|
|
charger);
|
|
int ret = 0;
|
|
|
|
switch (psp) {
|
|
case POWER_SUPPLY_PROP_STATUS:
|
|
val->intval = max14577_get_charger_state(chg);
|
|
break;
|
|
case POWER_SUPPLY_PROP_CHARGE_TYPE:
|
|
val->intval = max14577_get_charge_type(chg);
|
|
break;
|
|
case POWER_SUPPLY_PROP_HEALTH:
|
|
val->intval = max14577_get_battery_health(chg);
|
|
break;
|
|
case POWER_SUPPLY_PROP_PRESENT:
|
|
val->intval = max14577_get_present(chg);
|
|
break;
|
|
case POWER_SUPPLY_PROP_ONLINE:
|
|
val->intval = max14577_get_online(chg);
|
|
break;
|
|
case POWER_SUPPLY_PROP_MODEL_NAME:
|
|
val->strval = model_name;
|
|
break;
|
|
case POWER_SUPPLY_PROP_MANUFACTURER:
|
|
val->strval = manufacturer;
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int max14577_charger_probe(struct platform_device *pdev)
|
|
{
|
|
struct max14577_charger *chg;
|
|
struct max14577 *max14577 = 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->max14577 = max14577;
|
|
|
|
max14577_charger_reg_init(chg);
|
|
|
|
chg->charger.name = "max14577-charger",
|
|
chg->charger.type = POWER_SUPPLY_TYPE_BATTERY,
|
|
chg->charger.properties = max14577_charger_props,
|
|
chg->charger.num_properties = ARRAY_SIZE(max14577_charger_props),
|
|
chg->charger.get_property = max14577_charger_get_property,
|
|
|
|
ret = power_supply_register(&pdev->dev, &chg->charger);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "failed: power supply register\n");
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int max14577_charger_remove(struct platform_device *pdev)
|
|
{
|
|
struct max14577_charger *chg = platform_get_drvdata(pdev);
|
|
|
|
power_supply_unregister(&chg->charger);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver max14577_charger_driver = {
|
|
.driver = {
|
|
.owner = THIS_MODULE,
|
|
.name = "max14577-charger",
|
|
},
|
|
.probe = max14577_charger_probe,
|
|
.remove = max14577_charger_remove,
|
|
};
|
|
module_platform_driver(max14577_charger_driver);
|
|
|
|
MODULE_AUTHOR("Krzysztof Kozlowski <k.kozlowski@samsung.com>");
|
|
MODULE_DESCRIPTION("MAXIM 14577 charger driver");
|
|
MODULE_LICENSE("GPL");
|