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linux/drivers/power/supply/act8945a_charger.c
Uwe Kleine-König 7a9a496677 power: supply: act8945a_charger: Convert to platform remove callback returning void 
The .remove() callback for a platform driver returns an int which makes
many driver authors wrongly assume it's possible to do error handling by
returning an error code. However the value returned is ignored (apart
from emitting a warning) and this typically results in resource leaks.
To improve here there is a quest to make the remove callback return
void. In the first step of this quest all drivers are converted to
.remove_new() which already returns void. Eventually after all drivers
are converted, .remove_new() is renamed to .remove().

Trivially convert this driver from always returning zero in the remove
callback to the void returning variant.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Link: https://lore.kernel.org/r/20230918133700.1254499-7-u.kleine-koenig@pengutronix.de
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
2023-09-18 20:08:02 +02:00

661 lines
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// SPDX-License-Identifier: GPL-2.0-only
/*
* Power supply driver for the Active-semi ACT8945A PMIC
*
* Copyright (C) 2015 Atmel Corporation
*
* Author: Wenyou Yang <wenyou.yang@atmel.com>
*/
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_irq.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/regmap.h>
#include <linux/gpio/consumer.h>
static const char *act8945a_charger_model = "ACT8945A";
static const char *act8945a_charger_manufacturer = "Active-semi";
/*
* ACT8945A Charger Register Map
*/
/* 0x70: Reserved */
#define ACT8945A_APCH_CFG 0x71
#define ACT8945A_APCH_STATUS 0x78
#define ACT8945A_APCH_CTRL 0x79
#define ACT8945A_APCH_STATE 0x7A
/* ACT8945A_APCH_CFG */
#define APCH_CFG_OVPSET (0x3 << 0)
#define APCH_CFG_OVPSET_6V6 (0x0 << 0)
#define APCH_CFG_OVPSET_7V (0x1 << 0)
#define APCH_CFG_OVPSET_7V5 (0x2 << 0)
#define APCH_CFG_OVPSET_8V (0x3 << 0)
#define APCH_CFG_PRETIMO (0x3 << 2)
#define APCH_CFG_PRETIMO_40_MIN (0x0 << 2)
#define APCH_CFG_PRETIMO_60_MIN (0x1 << 2)
#define APCH_CFG_PRETIMO_80_MIN (0x2 << 2)
#define APCH_CFG_PRETIMO_DISABLED (0x3 << 2)
#define APCH_CFG_TOTTIMO (0x3 << 4)
#define APCH_CFG_TOTTIMO_3_HOUR (0x0 << 4)
#define APCH_CFG_TOTTIMO_4_HOUR (0x1 << 4)
#define APCH_CFG_TOTTIMO_5_HOUR (0x2 << 4)
#define APCH_CFG_TOTTIMO_DISABLED (0x3 << 4)
#define APCH_CFG_SUSCHG (0x1 << 7)
#define APCH_STATUS_CHGDAT BIT(0)
#define APCH_STATUS_INDAT BIT(1)
#define APCH_STATUS_TEMPDAT BIT(2)
#define APCH_STATUS_TIMRDAT BIT(3)
#define APCH_STATUS_CHGSTAT BIT(4)
#define APCH_STATUS_INSTAT BIT(5)
#define APCH_STATUS_TEMPSTAT BIT(6)
#define APCH_STATUS_TIMRSTAT BIT(7)
#define APCH_CTRL_CHGEOCOUT BIT(0)
#define APCH_CTRL_INDIS BIT(1)
#define APCH_CTRL_TEMPOUT BIT(2)
#define APCH_CTRL_TIMRPRE BIT(3)
#define APCH_CTRL_CHGEOCIN BIT(4)
#define APCH_CTRL_INCON BIT(5)
#define APCH_CTRL_TEMPIN BIT(6)
#define APCH_CTRL_TIMRTOT BIT(7)
#define APCH_STATE_ACINSTAT (0x1 << 1)
#define APCH_STATE_CSTATE (0x3 << 4)
#define APCH_STATE_CSTATE_SHIFT 4
#define APCH_STATE_CSTATE_DISABLED 0x00
#define APCH_STATE_CSTATE_EOC 0x01
#define APCH_STATE_CSTATE_FAST 0x02
#define APCH_STATE_CSTATE_PRE 0x03
struct act8945a_charger {
struct power_supply *psy;
struct power_supply_desc desc;
struct regmap *regmap;
struct work_struct work;
bool init_done;
struct gpio_desc *lbo_gpio;
struct gpio_desc *chglev_gpio;
};
static int act8945a_get_charger_state(struct regmap *regmap, int *val)
{
int ret;
unsigned int status, state;
ret = regmap_read(regmap, ACT8945A_APCH_STATUS, &status);
if (ret < 0)
return ret;
ret = regmap_read(regmap, ACT8945A_APCH_STATE, &state);
if (ret < 0)
return ret;
state &= APCH_STATE_CSTATE;
state >>= APCH_STATE_CSTATE_SHIFT;
switch (state) {
case APCH_STATE_CSTATE_PRE:
case APCH_STATE_CSTATE_FAST:
*val = POWER_SUPPLY_STATUS_CHARGING;
break;
case APCH_STATE_CSTATE_EOC:
if (status & APCH_STATUS_CHGDAT)
*val = POWER_SUPPLY_STATUS_FULL;
else
*val = POWER_SUPPLY_STATUS_CHARGING;
break;
case APCH_STATE_CSTATE_DISABLED:
default:
if (!(status & APCH_STATUS_INDAT))
*val = POWER_SUPPLY_STATUS_DISCHARGING;
else
*val = POWER_SUPPLY_STATUS_NOT_CHARGING;
break;
}
return 0;
}
static int act8945a_get_charge_type(struct regmap *regmap, int *val)
{
int ret;
unsigned int status, state;
ret = regmap_read(regmap, ACT8945A_APCH_STATUS, &status);
if (ret < 0)
return ret;
ret = regmap_read(regmap, ACT8945A_APCH_STATE, &state);
if (ret < 0)
return ret;
state &= APCH_STATE_CSTATE;
state >>= APCH_STATE_CSTATE_SHIFT;
switch (state) {
case APCH_STATE_CSTATE_PRE:
*val = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
break;
case APCH_STATE_CSTATE_FAST:
*val = POWER_SUPPLY_CHARGE_TYPE_FAST;
break;
case APCH_STATE_CSTATE_EOC:
*val = POWER_SUPPLY_CHARGE_TYPE_NONE;
break;
case APCH_STATE_CSTATE_DISABLED:
default:
if (!(status & APCH_STATUS_INDAT))
*val = POWER_SUPPLY_CHARGE_TYPE_NONE;
else
*val = POWER_SUPPLY_CHARGE_TYPE_UNKNOWN;
break;
}
return 0;
}
static int act8945a_get_battery_health(struct regmap *regmap, int *val)
{
int ret;
unsigned int status, state, config;
ret = regmap_read(regmap, ACT8945A_APCH_STATUS, &status);
if (ret < 0)
return ret;
ret = regmap_read(regmap, ACT8945A_APCH_CFG, &config);
if (ret < 0)
return ret;
ret = regmap_read(regmap, ACT8945A_APCH_STATE, &state);
if (ret < 0)
return ret;
state &= APCH_STATE_CSTATE;
state >>= APCH_STATE_CSTATE_SHIFT;
switch (state) {
case APCH_STATE_CSTATE_DISABLED:
if (config & APCH_CFG_SUSCHG) {
*val = POWER_SUPPLY_HEALTH_UNKNOWN;
} else if (status & APCH_STATUS_INDAT) {
if (!(status & APCH_STATUS_TEMPDAT))
*val = POWER_SUPPLY_HEALTH_OVERHEAT;
else if (status & APCH_STATUS_TIMRDAT)
*val = POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE;
else
*val = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
} else {
*val = POWER_SUPPLY_HEALTH_GOOD;
}
break;
case APCH_STATE_CSTATE_PRE:
case APCH_STATE_CSTATE_FAST:
case APCH_STATE_CSTATE_EOC:
default:
*val = POWER_SUPPLY_HEALTH_GOOD;
break;
}
return 0;
}
static int act8945a_get_capacity_level(struct act8945a_charger *charger,
struct regmap *regmap, int *val)
{
int ret;
unsigned int status, state, config;
int lbo_level = gpiod_get_value(charger->lbo_gpio);
ret = regmap_read(regmap, ACT8945A_APCH_STATUS, &status);
if (ret < 0)
return ret;
ret = regmap_read(regmap, ACT8945A_APCH_CFG, &config);
if (ret < 0)
return ret;
ret = regmap_read(regmap, ACT8945A_APCH_STATE, &state);
if (ret < 0)
return ret;
state &= APCH_STATE_CSTATE;
state >>= APCH_STATE_CSTATE_SHIFT;
switch (state) {
case APCH_STATE_CSTATE_PRE:
*val = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
break;
case APCH_STATE_CSTATE_FAST:
if (lbo_level)
*val = POWER_SUPPLY_CAPACITY_LEVEL_HIGH;
else
*val = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
break;
case APCH_STATE_CSTATE_EOC:
if (status & APCH_STATUS_CHGDAT)
*val = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
else
*val = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
break;
case APCH_STATE_CSTATE_DISABLED:
default:
if (config & APCH_CFG_SUSCHG) {
*val = POWER_SUPPLY_CAPACITY_LEVEL_UNKNOWN;
} else {
*val = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
if (!(status & APCH_STATUS_INDAT)) {
if (!lbo_level)
*val = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
}
}
break;
}
return 0;
}
#define MAX_CURRENT_USB_HIGH 450000
#define MAX_CURRENT_USB_LOW 90000
#define MAX_CURRENT_USB_PRE 45000
/*
* Riset(K) = 2336 * (1V/Ichg(mA)) - 0.205
* Riset = 2.43K
*/
#define MAX_CURRENT_AC_HIGH 886527
#define MAX_CURRENT_AC_LOW 117305
#define MAX_CURRENT_AC_HIGH_PRE 88653
#define MAX_CURRENT_AC_LOW_PRE 11731
static int act8945a_get_current_max(struct act8945a_charger *charger,
struct regmap *regmap, int *val)
{
int ret;
unsigned int status, state;
unsigned int acin_state;
int chgin_level = gpiod_get_value(charger->chglev_gpio);
ret = regmap_read(regmap, ACT8945A_APCH_STATUS, &status);
if (ret < 0)
return ret;
ret = regmap_read(regmap, ACT8945A_APCH_STATE, &state);
if (ret < 0)
return ret;
acin_state = (state & APCH_STATE_ACINSTAT) >> 1;
state &= APCH_STATE_CSTATE;
state >>= APCH_STATE_CSTATE_SHIFT;
switch (state) {
case APCH_STATE_CSTATE_PRE:
if (acin_state) {
if (chgin_level)
*val = MAX_CURRENT_AC_HIGH_PRE;
else
*val = MAX_CURRENT_AC_LOW_PRE;
} else {
*val = MAX_CURRENT_USB_PRE;
}
break;
case APCH_STATE_CSTATE_FAST:
if (acin_state) {
if (chgin_level)
*val = MAX_CURRENT_AC_HIGH;
else
*val = MAX_CURRENT_AC_LOW;
} else {
if (chgin_level)
*val = MAX_CURRENT_USB_HIGH;
else
*val = MAX_CURRENT_USB_LOW;
}
break;
case APCH_STATE_CSTATE_EOC:
case APCH_STATE_CSTATE_DISABLED:
default:
*val = 0;
break;
}
return 0;
}
static enum power_supply_property act8945a_charger_props[] = {
POWER_SUPPLY_PROP_STATUS,
POWER_SUPPLY_PROP_CHARGE_TYPE,
POWER_SUPPLY_PROP_TECHNOLOGY,
POWER_SUPPLY_PROP_HEALTH,
POWER_SUPPLY_PROP_CAPACITY_LEVEL,
POWER_SUPPLY_PROP_CURRENT_MAX,
POWER_SUPPLY_PROP_MODEL_NAME,
POWER_SUPPLY_PROP_MANUFACTURER
};
static int act8945a_charger_get_property(struct power_supply *psy,
enum power_supply_property prop,
union power_supply_propval *val)
{
struct act8945a_charger *charger = power_supply_get_drvdata(psy);
struct regmap *regmap = charger->regmap;
int ret = 0;
switch (prop) {
case POWER_SUPPLY_PROP_STATUS:
ret = act8945a_get_charger_state(regmap, &val->intval);
break;
case POWER_SUPPLY_PROP_CHARGE_TYPE:
ret = act8945a_get_charge_type(regmap, &val->intval);
break;
case POWER_SUPPLY_PROP_TECHNOLOGY:
val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
break;
case POWER_SUPPLY_PROP_HEALTH:
ret = act8945a_get_battery_health(regmap, &val->intval);
break;
case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
ret = act8945a_get_capacity_level(charger,
regmap, &val->intval);
break;
case POWER_SUPPLY_PROP_CURRENT_MAX:
ret = act8945a_get_current_max(charger,
regmap, &val->intval);
break;
case POWER_SUPPLY_PROP_MODEL_NAME:
val->strval = act8945a_charger_model;
break;
case POWER_SUPPLY_PROP_MANUFACTURER:
val->strval = act8945a_charger_manufacturer;
break;
default:
return -EINVAL;
}
return ret;
}
static int act8945a_enable_interrupt(struct act8945a_charger *charger)
{
struct regmap *regmap = charger->regmap;
unsigned char ctrl;
int ret;
ctrl = APCH_CTRL_CHGEOCOUT | APCH_CTRL_CHGEOCIN |
APCH_CTRL_INDIS | APCH_CTRL_INCON |
APCH_CTRL_TEMPOUT | APCH_CTRL_TEMPIN |
APCH_CTRL_TIMRPRE | APCH_CTRL_TIMRTOT;
ret = regmap_write(regmap, ACT8945A_APCH_CTRL, ctrl);
if (ret)
return ret;
ctrl = APCH_STATUS_CHGSTAT | APCH_STATUS_INSTAT |
APCH_STATUS_TEMPSTAT | APCH_STATUS_TIMRSTAT;
ret = regmap_write(regmap, ACT8945A_APCH_STATUS, ctrl);
if (ret)
return ret;
return 0;
}
static unsigned int act8945a_set_supply_type(struct act8945a_charger *charger,
unsigned int *type)
{
unsigned int status, state;
int ret;
ret = regmap_read(charger->regmap, ACT8945A_APCH_STATUS, &status);
if (ret < 0)
return ret;
ret = regmap_read(charger->regmap, ACT8945A_APCH_STATE, &state);
if (ret < 0)
return ret;
if (status & APCH_STATUS_INDAT) {
if (state & APCH_STATE_ACINSTAT)
*type = POWER_SUPPLY_TYPE_MAINS;
else
*type = POWER_SUPPLY_TYPE_USB;
} else {
*type = POWER_SUPPLY_TYPE_BATTERY;
}
return 0;
}
static void act8945a_work(struct work_struct *work)
{
struct act8945a_charger *charger =
container_of(work, struct act8945a_charger, work);
act8945a_set_supply_type(charger, &charger->desc.type);
power_supply_changed(charger->psy);
}
static irqreturn_t act8945a_status_changed(int irq, void *dev_id)
{
struct act8945a_charger *charger = dev_id;
if (charger->init_done)
schedule_work(&charger->work);
return IRQ_HANDLED;
}
#define DEFAULT_TOTAL_TIME_OUT 3
#define DEFAULT_PRE_TIME_OUT 40
#define DEFAULT_INPUT_OVP_THRESHOLD 6600
static int act8945a_charger_config(struct device *dev,
struct act8945a_charger *charger)
{
struct device_node *np = dev->of_node;
struct regmap *regmap = charger->regmap;
u32 total_time_out;
u32 pre_time_out;
u32 input_voltage_threshold;
int err, ret;
unsigned int tmp;
unsigned int value = 0;
if (!np) {
dev_err(dev, "no charger of node\n");
return -EINVAL;
}
ret = regmap_read(regmap, ACT8945A_APCH_CFG, &tmp);
if (ret)
return ret;
if (tmp & APCH_CFG_SUSCHG) {
value |= APCH_CFG_SUSCHG;
dev_info(dev, "have been suspended\n");
}
charger->lbo_gpio = devm_gpiod_get_optional(dev, "active-semi,lbo",
GPIOD_IN);
if (IS_ERR(charger->lbo_gpio)) {
err = PTR_ERR(charger->lbo_gpio);
dev_err(dev, "unable to claim gpio \"lbo\": %d\n", err);
return err;
}
ret = devm_request_irq(dev, gpiod_to_irq(charger->lbo_gpio),
act8945a_status_changed,
(IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING),
"act8945a_lbo_detect", charger);
if (ret)
dev_info(dev, "failed to request gpio \"lbo\" IRQ\n");
charger->chglev_gpio = devm_gpiod_get_optional(dev,
"active-semi,chglev",
GPIOD_IN);
if (IS_ERR(charger->chglev_gpio)) {
err = PTR_ERR(charger->chglev_gpio);
dev_err(dev, "unable to claim gpio \"chglev\": %d\n", err);
return err;
}
if (of_property_read_u32(np,
"active-semi,input-voltage-threshold-microvolt",
&input_voltage_threshold))
input_voltage_threshold = DEFAULT_INPUT_OVP_THRESHOLD;
if (of_property_read_u32(np,
"active-semi,precondition-timeout",
&pre_time_out))
pre_time_out = DEFAULT_PRE_TIME_OUT;
if (of_property_read_u32(np, "active-semi,total-timeout",
&total_time_out))
total_time_out = DEFAULT_TOTAL_TIME_OUT;
switch (input_voltage_threshold) {
case 8000:
value |= APCH_CFG_OVPSET_8V;
break;
case 7500:
value |= APCH_CFG_OVPSET_7V5;
break;
case 7000:
value |= APCH_CFG_OVPSET_7V;
break;
case 6600:
default:
value |= APCH_CFG_OVPSET_6V6;
break;
}
switch (pre_time_out) {
case 60:
value |= APCH_CFG_PRETIMO_60_MIN;
break;
case 80:
value |= APCH_CFG_PRETIMO_80_MIN;
break;
case 0:
value |= APCH_CFG_PRETIMO_DISABLED;
break;
case 40:
default:
value |= APCH_CFG_PRETIMO_40_MIN;
break;
}
switch (total_time_out) {
case 4:
value |= APCH_CFG_TOTTIMO_4_HOUR;
break;
case 5:
value |= APCH_CFG_TOTTIMO_5_HOUR;
break;
case 0:
value |= APCH_CFG_TOTTIMO_DISABLED;
break;
case 3:
default:
value |= APCH_CFG_TOTTIMO_3_HOUR;
break;
}
return regmap_write(regmap, ACT8945A_APCH_CFG, value);
}
static int act8945a_charger_probe(struct platform_device *pdev)
{
struct act8945a_charger *charger;
struct power_supply_config psy_cfg = {};
int irq, ret;
charger = devm_kzalloc(&pdev->dev, sizeof(*charger), GFP_KERNEL);
if (!charger)
return -ENOMEM;
charger->regmap = dev_get_regmap(pdev->dev.parent, NULL);
if (!charger->regmap) {
dev_err(&pdev->dev, "Parent did not provide regmap\n");
return -EINVAL;
}
ret = act8945a_charger_config(&pdev->dev, charger);
if (ret)
return ret;
irq = of_irq_get(pdev->dev.of_node, 0);
if (irq <= 0) {
dev_err(&pdev->dev, "failed to find IRQ number\n");
return irq ?: -ENXIO;
}
ret = devm_request_irq(&pdev->dev, irq, act8945a_status_changed,
IRQF_TRIGGER_FALLING, "act8945a_interrupt",
charger);
if (ret) {
dev_err(&pdev->dev, "failed to request nIRQ pin IRQ\n");
return ret;
}
charger->desc.name = "act8945a-charger";
charger->desc.get_property = act8945a_charger_get_property;
charger->desc.properties = act8945a_charger_props;
charger->desc.num_properties = ARRAY_SIZE(act8945a_charger_props);
ret = act8945a_set_supply_type(charger, &charger->desc.type);
if (ret)
return -EINVAL;
psy_cfg.of_node = pdev->dev.of_node;
psy_cfg.drv_data = charger;
charger->psy = devm_power_supply_register(&pdev->dev,
&charger->desc,
&psy_cfg);
if (IS_ERR(charger->psy)) {
dev_err(&pdev->dev, "failed to register power supply\n");
return PTR_ERR(charger->psy);
}
platform_set_drvdata(pdev, charger);
INIT_WORK(&charger->work, act8945a_work);
ret = act8945a_enable_interrupt(charger);
if (ret)
return -EIO;
charger->init_done = true;
return 0;
}
static void act8945a_charger_remove(struct platform_device *pdev)
{
struct act8945a_charger *charger = platform_get_drvdata(pdev);
charger->init_done = false;
cancel_work_sync(&charger->work);
}
static struct platform_driver act8945a_charger_driver = {
.driver = {
.name = "act8945a-charger",
},
.probe = act8945a_charger_probe,
.remove_new = act8945a_charger_remove,
};
module_platform_driver(act8945a_charger_driver);
MODULE_DESCRIPTION("Active-semi ACT8945A ActivePath charger driver");
MODULE_AUTHOR("Wenyou Yang <wenyou.yang@atmel.com>");
MODULE_LICENSE("GPL");
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