mirror of
https://github.com/torvalds/linux.git
synced 2024-12-27 05:11:48 +00:00
343160e98c
Define a MODULE_ALIAS() in the charger sub-driver for max77650 so that the appropriate module gets loaded together with the core mfd driver. Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com> Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
370 lines
9.6 KiB
C
370 lines
9.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
//
|
|
// Copyright (C) 2018 BayLibre SAS
|
|
// Author: Bartosz Golaszewski <bgolaszewski@baylibre.com>
|
|
//
|
|
// Battery charger driver for MAXIM 77650/77651 charger/power-supply.
|
|
|
|
#include <linux/i2c.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/mfd/max77650.h>
|
|
#include <linux/module.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/power_supply.h>
|
|
#include <linux/regmap.h>
|
|
|
|
#define MAX77650_CHARGER_ENABLED BIT(0)
|
|
#define MAX77650_CHARGER_DISABLED 0x00
|
|
#define MAX77650_CHARGER_CHG_EN_MASK BIT(0)
|
|
|
|
#define MAX77650_CHG_DETAILS_MASK GENMASK(7, 4)
|
|
#define MAX77650_CHG_DETAILS_BITS(_reg) \
|
|
(((_reg) & MAX77650_CHG_DETAILS_MASK) >> 4)
|
|
|
|
/* Charger is OFF. */
|
|
#define MAX77650_CHG_OFF 0x00
|
|
/* Charger is in prequalification mode. */
|
|
#define MAX77650_CHG_PREQ 0x01
|
|
/* Charger is in fast-charge constant current mode. */
|
|
#define MAX77650_CHG_ON_CURR 0x02
|
|
/* Charger is in JEITA modified fast-charge constant-current mode. */
|
|
#define MAX77650_CHG_ON_CURR_JEITA 0x03
|
|
/* Charger is in fast-charge constant-voltage mode. */
|
|
#define MAX77650_CHG_ON_VOLT 0x04
|
|
/* Charger is in JEITA modified fast-charge constant-voltage mode. */
|
|
#define MAX77650_CHG_ON_VOLT_JEITA 0x05
|
|
/* Charger is in top-off mode. */
|
|
#define MAX77650_CHG_ON_TOPOFF 0x06
|
|
/* Charger is in JEITA modified top-off mode. */
|
|
#define MAX77650_CHG_ON_TOPOFF_JEITA 0x07
|
|
/* Charger is done. */
|
|
#define MAX77650_CHG_DONE 0x08
|
|
/* Charger is JEITA modified done. */
|
|
#define MAX77650_CHG_DONE_JEITA 0x09
|
|
/* Charger is suspended due to a prequalification timer fault. */
|
|
#define MAX77650_CHG_SUSP_PREQ_TIM_FAULT 0x0a
|
|
/* Charger is suspended due to a fast-charge timer fault. */
|
|
#define MAX77650_CHG_SUSP_FAST_CHG_TIM_FAULT 0x0b
|
|
/* Charger is suspended due to a battery temperature fault. */
|
|
#define MAX77650_CHG_SUSP_BATT_TEMP_FAULT 0x0c
|
|
|
|
#define MAX77650_CHGIN_DETAILS_MASK GENMASK(3, 2)
|
|
#define MAX77650_CHGIN_DETAILS_BITS(_reg) \
|
|
(((_reg) & MAX77650_CHGIN_DETAILS_MASK) >> 2)
|
|
|
|
#define MAX77650_CHGIN_UNDERVOLTAGE_LOCKOUT 0x00
|
|
#define MAX77650_CHGIN_OVERVOLTAGE_LOCKOUT 0x01
|
|
#define MAX77650_CHGIN_OKAY 0x11
|
|
|
|
#define MAX77650_CHARGER_CHG_MASK BIT(1)
|
|
#define MAX77650_CHARGER_CHG_CHARGING(_reg) \
|
|
(((_reg) & MAX77650_CHARGER_CHG_MASK) > 1)
|
|
|
|
#define MAX77650_CHARGER_VCHGIN_MIN_MASK 0xc0
|
|
#define MAX77650_CHARGER_VCHGIN_MIN_SHIFT(_val) ((_val) << 5)
|
|
|
|
#define MAX77650_CHARGER_ICHGIN_LIM_MASK 0x1c
|
|
#define MAX77650_CHARGER_ICHGIN_LIM_SHIFT(_val) ((_val) << 2)
|
|
|
|
struct max77650_charger_data {
|
|
struct regmap *map;
|
|
struct device *dev;
|
|
};
|
|
|
|
static enum power_supply_property max77650_charger_properties[] = {
|
|
POWER_SUPPLY_PROP_STATUS,
|
|
POWER_SUPPLY_PROP_ONLINE,
|
|
POWER_SUPPLY_PROP_CHARGE_TYPE
|
|
};
|
|
|
|
static const unsigned int max77650_charger_vchgin_min_table[] = {
|
|
4000000, 4100000, 4200000, 4300000, 4400000, 4500000, 4600000, 4700000
|
|
};
|
|
|
|
static const unsigned int max77650_charger_ichgin_lim_table[] = {
|
|
95000, 190000, 285000, 380000, 475000
|
|
};
|
|
|
|
static int max77650_charger_set_vchgin_min(struct max77650_charger_data *chg,
|
|
unsigned int val)
|
|
{
|
|
int i, rv;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(max77650_charger_vchgin_min_table); i++) {
|
|
if (val == max77650_charger_vchgin_min_table[i]) {
|
|
rv = regmap_update_bits(chg->map,
|
|
MAX77650_REG_CNFG_CHG_B,
|
|
MAX77650_CHARGER_VCHGIN_MIN_MASK,
|
|
MAX77650_CHARGER_VCHGIN_MIN_SHIFT(i));
|
|
if (rv)
|
|
return rv;
|
|
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
static int max77650_charger_set_ichgin_lim(struct max77650_charger_data *chg,
|
|
unsigned int val)
|
|
{
|
|
int i, rv;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(max77650_charger_ichgin_lim_table); i++) {
|
|
if (val == max77650_charger_ichgin_lim_table[i]) {
|
|
rv = regmap_update_bits(chg->map,
|
|
MAX77650_REG_CNFG_CHG_B,
|
|
MAX77650_CHARGER_ICHGIN_LIM_MASK,
|
|
MAX77650_CHARGER_ICHGIN_LIM_SHIFT(i));
|
|
if (rv)
|
|
return rv;
|
|
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
static int max77650_charger_enable(struct max77650_charger_data *chg)
|
|
{
|
|
int rv;
|
|
|
|
rv = regmap_update_bits(chg->map,
|
|
MAX77650_REG_CNFG_CHG_B,
|
|
MAX77650_CHARGER_CHG_EN_MASK,
|
|
MAX77650_CHARGER_ENABLED);
|
|
if (rv)
|
|
dev_err(chg->dev, "unable to enable the charger: %d\n", rv);
|
|
|
|
return rv;
|
|
}
|
|
|
|
static int max77650_charger_disable(struct max77650_charger_data *chg)
|
|
{
|
|
int rv;
|
|
|
|
rv = regmap_update_bits(chg->map,
|
|
MAX77650_REG_CNFG_CHG_B,
|
|
MAX77650_CHARGER_CHG_EN_MASK,
|
|
MAX77650_CHARGER_DISABLED);
|
|
if (rv)
|
|
dev_err(chg->dev, "unable to disable the charger: %d\n", rv);
|
|
|
|
return rv;
|
|
}
|
|
|
|
static irqreturn_t max77650_charger_check_status(int irq, void *data)
|
|
{
|
|
struct max77650_charger_data *chg = data;
|
|
int rv, reg;
|
|
|
|
rv = regmap_read(chg->map, MAX77650_REG_STAT_CHG_B, ®);
|
|
if (rv) {
|
|
dev_err(chg->dev,
|
|
"unable to read the charger status: %d\n", rv);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
switch (MAX77650_CHGIN_DETAILS_BITS(reg)) {
|
|
case MAX77650_CHGIN_UNDERVOLTAGE_LOCKOUT:
|
|
dev_err(chg->dev, "undervoltage lockout detected, disabling charger\n");
|
|
max77650_charger_disable(chg);
|
|
break;
|
|
case MAX77650_CHGIN_OVERVOLTAGE_LOCKOUT:
|
|
dev_err(chg->dev, "overvoltage lockout detected, disabling charger\n");
|
|
max77650_charger_disable(chg);
|
|
break;
|
|
case MAX77650_CHGIN_OKAY:
|
|
max77650_charger_enable(chg);
|
|
break;
|
|
default:
|
|
/* May be 0x10 - debouncing */
|
|
break;
|
|
}
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static int max77650_charger_get_property(struct power_supply *psy,
|
|
enum power_supply_property psp,
|
|
union power_supply_propval *val)
|
|
{
|
|
struct max77650_charger_data *chg = power_supply_get_drvdata(psy);
|
|
int rv, reg;
|
|
|
|
switch (psp) {
|
|
case POWER_SUPPLY_PROP_STATUS:
|
|
rv = regmap_read(chg->map, MAX77650_REG_STAT_CHG_B, ®);
|
|
if (rv)
|
|
return rv;
|
|
|
|
if (MAX77650_CHARGER_CHG_CHARGING(reg)) {
|
|
val->intval = POWER_SUPPLY_STATUS_CHARGING;
|
|
break;
|
|
}
|
|
|
|
switch (MAX77650_CHG_DETAILS_BITS(reg)) {
|
|
case MAX77650_CHG_OFF:
|
|
case MAX77650_CHG_SUSP_PREQ_TIM_FAULT:
|
|
case MAX77650_CHG_SUSP_FAST_CHG_TIM_FAULT:
|
|
case MAX77650_CHG_SUSP_BATT_TEMP_FAULT:
|
|
val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
|
|
break;
|
|
case MAX77650_CHG_PREQ:
|
|
case MAX77650_CHG_ON_CURR:
|
|
case MAX77650_CHG_ON_CURR_JEITA:
|
|
case MAX77650_CHG_ON_VOLT:
|
|
case MAX77650_CHG_ON_VOLT_JEITA:
|
|
case MAX77650_CHG_ON_TOPOFF:
|
|
case MAX77650_CHG_ON_TOPOFF_JEITA:
|
|
val->intval = POWER_SUPPLY_STATUS_CHARGING;
|
|
break;
|
|
case MAX77650_CHG_DONE:
|
|
val->intval = POWER_SUPPLY_STATUS_FULL;
|
|
break;
|
|
default:
|
|
val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
|
|
}
|
|
break;
|
|
case POWER_SUPPLY_PROP_ONLINE:
|
|
rv = regmap_read(chg->map, MAX77650_REG_STAT_CHG_B, ®);
|
|
if (rv)
|
|
return rv;
|
|
|
|
val->intval = MAX77650_CHARGER_CHG_CHARGING(reg);
|
|
break;
|
|
case POWER_SUPPLY_PROP_CHARGE_TYPE:
|
|
rv = regmap_read(chg->map, MAX77650_REG_STAT_CHG_B, ®);
|
|
if (rv)
|
|
return rv;
|
|
|
|
if (!MAX77650_CHARGER_CHG_CHARGING(reg)) {
|
|
val->intval = POWER_SUPPLY_CHARGE_TYPE_NONE;
|
|
break;
|
|
}
|
|
|
|
switch (MAX77650_CHG_DETAILS_BITS(reg)) {
|
|
case MAX77650_CHG_PREQ:
|
|
case MAX77650_CHG_ON_CURR:
|
|
case MAX77650_CHG_ON_CURR_JEITA:
|
|
case MAX77650_CHG_ON_VOLT:
|
|
case MAX77650_CHG_ON_VOLT_JEITA:
|
|
val->intval = POWER_SUPPLY_CHARGE_TYPE_FAST;
|
|
break;
|
|
case MAX77650_CHG_ON_TOPOFF:
|
|
case MAX77650_CHG_ON_TOPOFF_JEITA:
|
|
val->intval = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
|
|
break;
|
|
default:
|
|
val->intval = POWER_SUPPLY_CHARGE_TYPE_UNKNOWN;
|
|
}
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct power_supply_desc max77650_battery_desc = {
|
|
.name = "max77650",
|
|
.type = POWER_SUPPLY_TYPE_USB,
|
|
.get_property = max77650_charger_get_property,
|
|
.properties = max77650_charger_properties,
|
|
.num_properties = ARRAY_SIZE(max77650_charger_properties),
|
|
};
|
|
|
|
static int max77650_charger_probe(struct platform_device *pdev)
|
|
{
|
|
struct power_supply_config pscfg = {};
|
|
struct max77650_charger_data *chg;
|
|
struct power_supply *battery;
|
|
struct device *dev, *parent;
|
|
int rv, chg_irq, chgin_irq;
|
|
unsigned int prop;
|
|
|
|
dev = &pdev->dev;
|
|
parent = dev->parent;
|
|
|
|
chg = devm_kzalloc(dev, sizeof(*chg), GFP_KERNEL);
|
|
if (!chg)
|
|
return -ENOMEM;
|
|
|
|
platform_set_drvdata(pdev, chg);
|
|
|
|
chg->map = dev_get_regmap(parent, NULL);
|
|
if (!chg->map)
|
|
return -ENODEV;
|
|
|
|
chg->dev = dev;
|
|
|
|
pscfg.of_node = dev->of_node;
|
|
pscfg.drv_data = chg;
|
|
|
|
chg_irq = platform_get_irq_byname(pdev, "CHG");
|
|
if (chg_irq < 0)
|
|
return chg_irq;
|
|
|
|
chgin_irq = platform_get_irq_byname(pdev, "CHGIN");
|
|
if (chgin_irq < 0)
|
|
return chgin_irq;
|
|
|
|
rv = devm_request_any_context_irq(dev, chg_irq,
|
|
max77650_charger_check_status,
|
|
IRQF_ONESHOT, "chg", chg);
|
|
if (rv < 0)
|
|
return rv;
|
|
|
|
rv = devm_request_any_context_irq(dev, chgin_irq,
|
|
max77650_charger_check_status,
|
|
IRQF_ONESHOT, "chgin", chg);
|
|
if (rv < 0)
|
|
return rv;
|
|
|
|
battery = devm_power_supply_register(dev,
|
|
&max77650_battery_desc, &pscfg);
|
|
if (IS_ERR(battery))
|
|
return PTR_ERR(battery);
|
|
|
|
rv = of_property_read_u32(dev->of_node,
|
|
"input-voltage-min-microvolt", &prop);
|
|
if (rv == 0) {
|
|
rv = max77650_charger_set_vchgin_min(chg, prop);
|
|
if (rv)
|
|
return rv;
|
|
}
|
|
|
|
rv = of_property_read_u32(dev->of_node,
|
|
"input-current-limit-microamp", &prop);
|
|
if (rv == 0) {
|
|
rv = max77650_charger_set_ichgin_lim(chg, prop);
|
|
if (rv)
|
|
return rv;
|
|
}
|
|
|
|
return max77650_charger_enable(chg);
|
|
}
|
|
|
|
static int max77650_charger_remove(struct platform_device *pdev)
|
|
{
|
|
struct max77650_charger_data *chg = platform_get_drvdata(pdev);
|
|
|
|
return max77650_charger_disable(chg);
|
|
}
|
|
|
|
static struct platform_driver max77650_charger_driver = {
|
|
.driver = {
|
|
.name = "max77650-charger",
|
|
},
|
|
.probe = max77650_charger_probe,
|
|
.remove = max77650_charger_remove,
|
|
};
|
|
module_platform_driver(max77650_charger_driver);
|
|
|
|
MODULE_DESCRIPTION("MAXIM 77650/77651 charger driver");
|
|
MODULE_AUTHOR("Bartosz Golaszewski <bgolaszewski@baylibre.com>");
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_ALIAS("platform:max77650-charger");
|