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mirror-linux/drivers/power/supply/max77705_charger.c

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// SPDX-License-Identifier: GPL-2.0
/*
* Based on max77650-charger.c
*
* Copyright (C) 2025 Dzmitry Sankouski <dsankouski@gmail.org>
*
* Battery charger driver for MAXIM 77705 charger/power-supply.
*/
#include <linux/devm-helpers.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/mfd/max77693-common.h>
#include <linux/mfd/max77705-private.h>
#include <linux/power/max77705_charger.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/regmap.h>
static const char *max77705_charger_model = "max77705";
static const char *max77705_charger_manufacturer = "Maxim Integrated";
static const struct regmap_config max77705_chg_regmap_config = {
.reg_base = MAX77705_CHG_REG_BASE,
.reg_bits = 8,
.val_bits = 8,
.max_register = MAX77705_CHG_REG_SAFEOUT_CTRL,
};
static enum power_supply_property max77705_charger_props[] = {
POWER_SUPPLY_PROP_ONLINE,
POWER_SUPPLY_PROP_PRESENT,
POWER_SUPPLY_PROP_STATUS,
POWER_SUPPLY_PROP_CHARGE_TYPE,
POWER_SUPPLY_PROP_HEALTH,
POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT,
};
static irqreturn_t max77705_aicl_irq(int irq, void *irq_drv_data)
{
struct max77705_charger_data *chg = irq_drv_data;
unsigned int regval, irq_status;
int err;
err = regmap_read(chg->regmap, MAX77705_CHG_REG_INT_OK, &irq_status);
if (err < 0)
return IRQ_HANDLED;
// irq is fiered at the end of current decrease sequence too
// early check AICL_I bit to guard against that excess irq call
while (!(irq_status & BIT(MAX77705_AICL_I))) {
err = regmap_field_read(chg->rfield[MAX77705_CHG_CHGIN_LIM], &regval);
if (err < 0)
return IRQ_HANDLED;
regval--;
err = regmap_field_write(chg->rfield[MAX77705_CHG_CHGIN_LIM], regval);
if (err < 0)
return IRQ_HANDLED;
msleep(AICL_WORK_DELAY_MS);
err = regmap_read(chg->regmap, MAX77705_CHG_REG_INT_OK, &irq_status);
if (err < 0)
return IRQ_HANDLED;
}
return IRQ_HANDLED;
}
static irqreturn_t max77705_chgin_irq(int irq, void *irq_drv_data)
{
struct max77705_charger_data *chg = irq_drv_data;
queue_work(chg->wqueue, &chg->chgin_work);
return IRQ_HANDLED;
}
static const struct regmap_irq max77705_charger_irqs[] = {
REGMAP_IRQ_REG_LINE(MAX77705_BYP_I, BITS_PER_BYTE),
REGMAP_IRQ_REG_LINE(MAX77705_INP_LIMIT_I, BITS_PER_BYTE),
REGMAP_IRQ_REG_LINE(MAX77705_BATP_I, BITS_PER_BYTE),
REGMAP_IRQ_REG_LINE(MAX77705_BAT_I, BITS_PER_BYTE),
REGMAP_IRQ_REG_LINE(MAX77705_CHG_I, BITS_PER_BYTE),
REGMAP_IRQ_REG_LINE(MAX77705_WCIN_I, BITS_PER_BYTE),
REGMAP_IRQ_REG_LINE(MAX77705_CHGIN_I, BITS_PER_BYTE),
REGMAP_IRQ_REG_LINE(MAX77705_AICL_I, BITS_PER_BYTE),
};
static const struct regmap_irq_chip max77705_charger_irq_chip = {
.name = "max77705-charger",
.status_base = MAX77705_CHG_REG_INT,
.mask_base = MAX77705_CHG_REG_INT_MASK,
.num_regs = 1,
.irqs = max77705_charger_irqs,
.num_irqs = ARRAY_SIZE(max77705_charger_irqs),
};
static int max77705_charger_enable(struct max77705_charger_data *chg)
{
int rv;
rv = regmap_field_write(chg->rfield[MAX77705_CHG_EN], 1);
if (rv)
dev_err(chg->dev, "unable to enable the charger: %d\n", rv);
return rv;
}
static void max77705_charger_disable(void *data)
{
struct max77705_charger_data *chg = data;
int rv;
rv = regmap_field_write(chg->rfield[MAX77705_CHG_EN], MAX77705_CHG_DISABLE);
if (rv)
dev_err(chg->dev, "unable to disable the charger: %d\n", rv);
}
static int max77705_get_online(struct regmap *regmap, int *val)
{
unsigned int data;
int ret;
ret = regmap_read(regmap, MAX77705_CHG_REG_INT_OK, &data);
if (ret < 0)
return ret;
*val = !!(data & MAX77705_CHGIN_OK);
return 0;
}
static int max77705_set_integer(struct max77705_charger_data *chg, enum max77705_field_idx fidx,
unsigned int clamp_min, unsigned int clamp_max,
unsigned int div, int val)
{
unsigned int regval;
regval = clamp_val(val, clamp_min, clamp_max) / div;
return regmap_field_write(chg->rfield[fidx], regval);
}
static int max77705_check_battery(struct max77705_charger_data *chg, int *val)
{
unsigned int reg_data;
unsigned int reg_data2;
struct regmap *regmap = chg->regmap;
regmap_read(regmap, MAX77705_CHG_REG_INT_OK, &reg_data);
dev_dbg(chg->dev, "CHG_INT_OK(0x%x)\n", reg_data);
regmap_read(regmap, MAX77705_CHG_REG_DETAILS_00, &reg_data2);
dev_dbg(chg->dev, "CHG_DETAILS00(0x%x)\n", reg_data2);
if ((reg_data & MAX77705_BATP_OK) || !(reg_data2 & MAX77705_BATP_DTLS))
*val = true;
else
*val = false;
return 0;
}
static int max77705_get_charge_type(struct max77705_charger_data *chg, int *val)
{
struct regmap *regmap = chg->regmap;
unsigned int reg_data, chg_en;
regmap_field_read(chg->rfield[MAX77705_CHG_EN], &chg_en);
if (!chg_en) {
*val = POWER_SUPPLY_CHARGE_TYPE_NONE;
return 0;
}
regmap_read(regmap, MAX77705_CHG_REG_DETAILS_01, &reg_data);
reg_data &= MAX77705_CHG_DTLS;
switch (reg_data) {
case 0x0:
case MAX77705_CHARGER_CONSTANT_CURRENT:
case MAX77705_CHARGER_CONSTANT_VOLTAGE:
*val = POWER_SUPPLY_CHARGE_TYPE_FAST;
return 0;
default:
*val = POWER_SUPPLY_CHARGE_TYPE_NONE;
return 0;
}
return 0;
}
static int max77705_get_status(struct max77705_charger_data *chg, int *val)
{
struct regmap *regmap = chg->regmap;
unsigned int reg_data, chg_en;
regmap_field_read(chg->rfield[MAX77705_CHG_EN], &chg_en);
if (!chg_en) {
*val = POWER_SUPPLY_CHARGE_TYPE_NONE;
return 0;
}
regmap_read(regmap, MAX77705_CHG_REG_DETAILS_01, &reg_data);
reg_data &= MAX77705_CHG_DTLS;
switch (reg_data) {
case 0x0:
case MAX77705_CHARGER_CONSTANT_CURRENT:
case MAX77705_CHARGER_CONSTANT_VOLTAGE:
*val = POWER_SUPPLY_STATUS_CHARGING;
return 0;
case MAX77705_CHARGER_END_OF_CHARGE:
case MAX77705_CHARGER_DONE:
*val = POWER_SUPPLY_STATUS_FULL;
return 0;
/* those values hard coded as in vendor kernel, because of */
/* failure to determine it's actual meaning. */
case 0x05:
case 0x06:
case 0x07:
*val = POWER_SUPPLY_STATUS_NOT_CHARGING;
return 0;
case 0x08:
case 0xA:
case 0xB:
*val = POWER_SUPPLY_STATUS_DISCHARGING;
return 0;
default:
*val = POWER_SUPPLY_STATUS_UNKNOWN;
return 0;
}
return 0;
}
static int max77705_get_vbus_state(struct regmap *regmap, int *value)
{
int ret;
unsigned int charge_dtls;
ret = regmap_read(regmap, MAX77705_CHG_REG_DETAILS_00, &charge_dtls);
if (ret)
return ret;
charge_dtls = ((charge_dtls & MAX77705_CHGIN_DTLS) >>
MAX77705_CHGIN_DTLS_SHIFT);
switch (charge_dtls) {
case 0x00:
*value = POWER_SUPPLY_HEALTH_UNDERVOLTAGE;
break;
case 0x01:
*value = POWER_SUPPLY_HEALTH_UNDERVOLTAGE;
break;
case 0x02:
*value = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
break;
case 0x03:
*value = POWER_SUPPLY_HEALTH_GOOD;
break;
default:
return 0;
}
return 0;
}
static int max77705_get_battery_health(struct max77705_charger_data *chg,
int *value)
{
struct regmap *regmap = chg->regmap;
unsigned int bat_dtls;
regmap_read(regmap, MAX77705_CHG_REG_DETAILS_01, &bat_dtls);
bat_dtls = ((bat_dtls & MAX77705_BAT_DTLS) >> MAX77705_BAT_DTLS_SHIFT);
switch (bat_dtls) {
case MAX77705_BATTERY_NOBAT:
dev_dbg(chg->dev, "%s: No battery and the chg is suspended\n",
__func__);
*value = POWER_SUPPLY_HEALTH_NO_BATTERY;
break;
case MAX77705_BATTERY_PREQUALIFICATION:
dev_dbg(chg->dev, "%s: battery is okay but its voltage is low(~VPQLB)\n",
__func__);
break;
case MAX77705_BATTERY_DEAD:
dev_dbg(chg->dev, "%s: battery dead\n", __func__);
*value = POWER_SUPPLY_HEALTH_DEAD;
break;
case MAX77705_BATTERY_GOOD:
case MAX77705_BATTERY_LOWVOLTAGE:
*value = POWER_SUPPLY_HEALTH_GOOD;
break;
case MAX77705_BATTERY_OVERVOLTAGE:
dev_dbg(chg->dev, "%s: battery ovp\n", __func__);
*value = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
break;
default:
dev_dbg(chg->dev, "%s: battery unknown\n", __func__);
*value = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
break;
}
return 0;
}
static int max77705_get_health(struct max77705_charger_data *chg, int *val)
{
struct regmap *regmap = chg->regmap;
int ret, is_online = 0;
ret = max77705_get_online(regmap, &is_online);
if (ret)
return ret;
if (is_online) {
ret = max77705_get_vbus_state(regmap, val);
if (ret || (*val != POWER_SUPPLY_HEALTH_GOOD))
return ret;
}
return max77705_get_battery_health(chg, val);
}
static int max77705_get_input_current(struct max77705_charger_data *chg,
int *val)
{
unsigned int reg_data;
int get_current = 0;
regmap_field_read(chg->rfield[MAX77705_CHG_CHGIN_LIM], &reg_data);
if (reg_data <= 3)
get_current = MAX77705_CURRENT_CHGIN_MIN;
else
get_current = (reg_data + 1) * MAX77705_CURRENT_CHGIN_STEP;
*val = get_current;
return 0;
}
static int max77705_get_charge_current(struct max77705_charger_data *chg,
int *val)
{
unsigned int reg_data;
regmap_field_read(chg->rfield[MAX77705_CHG_CC_LIM], &reg_data);
*val = reg_data <= 0x2 ? MAX77705_CURRENT_CHGIN_MIN : reg_data * MAX77705_CURRENT_CHG_STEP;
return 0;
}
static int max77705_set_float_voltage(struct max77705_charger_data *chg,
int float_voltage)
{
int float_voltage_mv;
unsigned int reg_data = 0;
float_voltage_mv = float_voltage / 1000;
reg_data = float_voltage_mv <= 4000 ? 0x0 :
float_voltage_mv >= 4500 ? 0x23 :
(float_voltage_mv <= 4200) ? (float_voltage_mv - 4000) / 50 :
(((float_voltage_mv - 4200) / 10) + 0x04);
return regmap_field_write(chg->rfield[MAX77705_CHG_CV_PRM], reg_data);
}
static int max77705_get_float_voltage(struct max77705_charger_data *chg,
int *val)
{
unsigned int reg_data = 0;
int voltage_mv;
regmap_field_read(chg->rfield[MAX77705_CHG_CV_PRM], &reg_data);
voltage_mv = reg_data <= 0x04 ? reg_data * 50 + 4000 :
(reg_data - 4) * 10 + 4200;
*val = voltage_mv * 1000;
return 0;
}
static int max77705_chg_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
struct max77705_charger_data *chg = power_supply_get_drvdata(psy);
struct regmap *regmap = chg->regmap;
switch (psp) {
case POWER_SUPPLY_PROP_ONLINE:
return max77705_get_online(regmap, &val->intval);
case POWER_SUPPLY_PROP_PRESENT:
return max77705_check_battery(chg, &val->intval);
case POWER_SUPPLY_PROP_STATUS:
return max77705_get_status(chg, &val->intval);
case POWER_SUPPLY_PROP_CHARGE_TYPE:
return max77705_get_charge_type(chg, &val->intval);
case POWER_SUPPLY_PROP_HEALTH:
return max77705_get_health(chg, &val->intval);
case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
return max77705_get_input_current(chg, &val->intval);
case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
return max77705_get_charge_current(chg, &val->intval);
case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
return max77705_get_float_voltage(chg, &val->intval);
case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
val->intval = chg->bat_info->voltage_max_design_uv;
break;
case POWER_SUPPLY_PROP_MODEL_NAME:
val->strval = max77705_charger_model;
break;
case POWER_SUPPLY_PROP_MANUFACTURER:
val->strval = max77705_charger_manufacturer;
break;
default:
return -EINVAL;
}
return 0;
}
static int max77705_set_property(struct power_supply *psy,
enum power_supply_property psp,
const union power_supply_propval *val)
{
struct max77705_charger_data *chg = power_supply_get_drvdata(psy);
int err = 0;
switch (psp) {
case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
err = max77705_set_integer(chg, MAX77705_CHG_CC_LIM,
MAX77705_CURRENT_CHGIN_MIN,
MAX77705_CURRENT_CHGIN_MAX,
MAX77705_CURRENT_CHG_STEP,
val->intval);
break;
case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
err = max77705_set_integer(chg, MAX77705_CHG_CHGIN_LIM,
MAX77705_CURRENT_CHGIN_MIN,
MAX77705_CURRENT_CHGIN_MAX,
MAX77705_CURRENT_CHGIN_STEP,
val->intval);
break;
default:
err = -EINVAL;
}
return err;
};
static int max77705_property_is_writeable(struct power_supply *psy,
enum power_supply_property psp)
{
switch (psp) {
case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
return true;
default:
return false;
}
}
static const struct power_supply_desc max77705_charger_psy_desc = {
.name = "max77705-charger",
.type = POWER_SUPPLY_TYPE_USB,
.properties = max77705_charger_props,
.property_is_writeable = max77705_property_is_writeable,
.num_properties = ARRAY_SIZE(max77705_charger_props),
.get_property = max77705_chg_get_property,
.set_property = max77705_set_property,
};
static void max77705_chgin_isr_work(struct work_struct *work)
{
struct max77705_charger_data *chg =
container_of(work, struct max77705_charger_data, chgin_work);
power_supply_changed(chg->psy_chg);
}
static int max77705_charger_initialize(struct max77705_charger_data *chg)
{
struct power_supply_battery_info *info;
struct regmap *regmap = chg->regmap;
int err;
err = power_supply_get_battery_info(chg->psy_chg, &info);
if (err)
return dev_err_probe(chg->dev, err, "error on getting battery info");
chg->bat_info = info;
/* unlock charger setting protect */
/* slowest LX slope */
err = regmap_field_write(chg->rfield[MAX77705_CHGPROT], MAX77705_CHGPROT_UNLOCKED);
if (err)
goto err;
err = regmap_field_write(chg->rfield[MAX77705_LX_SLOPE], MAX77705_SLOWEST_LX_SLOPE);
if (err)
goto err;
/* fast charge timer disable */
/* restart threshold disable */
/* pre-qual charge disable */
err = regmap_field_write(chg->rfield[MAX77705_FCHGTIME], MAX77705_FCHGTIME_DISABLE);
if (err)
goto err;
err = regmap_field_write(chg->rfield[MAX77705_CHG_RSTRT], MAX77705_CHG_RSTRT_DISABLE);
if (err)
goto err;
err = regmap_field_write(chg->rfield[MAX77705_CHG_PQEN], MAX77705_CHG_PQEN_DISABLE);
if (err)
goto err;
err = regmap_field_write(chg->rfield[MAX77705_MODE],
MAX77705_CHG_MASK | MAX77705_BUCK_MASK);
if (err)
goto err;
/* charge current 450mA(default) */
/* otg current limit 900mA */
err = regmap_field_write(chg->rfield[MAX77705_OTG_ILIM], MAX77705_OTG_ILIM_900);
if (err)
goto err;
/* BAT to SYS OCP 4.80A */
err = regmap_field_write(chg->rfield[MAX77705_REG_B2SOVRC], MAX77705_B2SOVRC_4_8A);
if (err)
goto err;
/* top off current 150mA */
/* top off timer 30min */
err = regmap_field_write(chg->rfield[MAX77705_TO], MAX77705_TO_ITH_150MA);
if (err)
goto err;
err = regmap_field_write(chg->rfield[MAX77705_TO_TIME], MAX77705_TO_TIME_30M);
if (err)
goto err;
err = regmap_field_write(chg->rfield[MAX77705_SYS_TRACK], MAX77705_SYS_TRACK_DISABLE);
if (err)
goto err;
/* cv voltage 4.2V or 4.35V */
/* MINVSYS 3.6V(default) */
if (info->voltage_max_design_uv < 0) {
dev_warn(chg->dev, "missing battery:voltage-max-design-microvolt\n");
max77705_set_float_voltage(chg, 4200000);
} else {
max77705_set_float_voltage(chg, info->voltage_max_design_uv);
}
err = regmap_field_write(chg->rfield[MAX77705_VCHGIN], MAX77705_VCHGIN_4_5);
if (err)
goto err;
err = regmap_field_write(chg->rfield[MAX77705_WCIN], MAX77705_WCIN_4_5);
if (err)
goto err;
/* Watchdog timer */
regmap_update_bits(regmap, MAX77705_CHG_REG_CNFG_00,
MAX77705_WDTEN_MASK, 0);
/* VBYPSET=5.0V */
err = regmap_field_write(chg->rfield[MAX77705_VBYPSET], 0);
if (err)
goto err;
/* Switching Frequency : 1.5MHz */
err = regmap_field_write(chg->rfield[MAX77705_REG_FSW], MAX77705_CHG_FSW_1_5MHz);
if (err)
goto err;
/* Auto skip mode */
err = regmap_field_write(chg->rfield[MAX77705_REG_DISKIP], MAX77705_AUTO_SKIP);
if (err)
goto err;
return 0;
err:
return dev_err_probe(chg->dev, err, "error while configuring");
}
static int max77705_charger_probe(struct i2c_client *i2c)
{
struct power_supply_config pscfg = {};
struct max77705_charger_data *chg;
struct regmap_irq_chip *chip_desc;
struct device *dev;
struct regmap_irq_chip_data *irq_data;
int ret;
dev = &i2c->dev;
chg = devm_kzalloc(dev, sizeof(*chg), GFP_KERNEL);
if (!chg)
return -ENOMEM;
chg->dev = dev;
i2c_set_clientdata(i2c, chg);
chip_desc = devm_kmemdup(dev, &max77705_charger_irq_chip,
sizeof(max77705_charger_irq_chip),
GFP_KERNEL);
if (!chip_desc)
return -ENOMEM;
chip_desc->irq_drv_data = chg;
chg->regmap = devm_regmap_init_i2c(i2c, &max77705_chg_regmap_config);
if (IS_ERR(chg->regmap))
return PTR_ERR(chg->regmap);
for (int i = 0; i < MAX77705_N_REGMAP_FIELDS; i++) {
chg->rfield[i] = devm_regmap_field_alloc(dev, chg->regmap,
max77705_reg_field[i]);
if (IS_ERR(chg->rfield[i]))
return dev_err_probe(dev, PTR_ERR(chg->rfield[i]),
"cannot allocate regmap field\n");
}
pscfg.fwnode = dev_fwnode(dev);
pscfg.drv_data = chg;
chg->psy_chg = devm_power_supply_register(dev, &max77705_charger_psy_desc, &pscfg);
if (IS_ERR(chg->psy_chg))
return PTR_ERR(chg->psy_chg);
ret = devm_regmap_add_irq_chip(chg->dev, chg->regmap, i2c->irq,
IRQF_ONESHOT, 0,
chip_desc, &irq_data);
if (ret)
return dev_err_probe(dev, ret, "failed to add irq chip\n");
chg->wqueue = create_singlethread_workqueue(dev_name(dev));
if (!chg->wqueue)
return -ENOMEM;
ret = devm_work_autocancel(dev, &chg->chgin_work, max77705_chgin_isr_work);
if (ret) {
dev_err_probe(dev, ret, "failed to initialize interrupt work\n");
goto destroy_wq;
}
ret = max77705_charger_initialize(chg);
if (ret) {
dev_err_probe(dev, ret, "failed to initialize charger IC\n");
goto destroy_wq;
}
ret = devm_request_threaded_irq(dev, regmap_irq_get_virq(irq_data, MAX77705_CHGIN_I),
NULL, max77705_chgin_irq,
IRQF_TRIGGER_NONE,
"chgin-irq", chg);
if (ret) {
dev_err_probe(dev, ret, "Failed to Request chgin IRQ\n");
goto destroy_wq;
}
ret = devm_request_threaded_irq(dev, regmap_irq_get_virq(irq_data, MAX77705_AICL_I),
NULL, max77705_aicl_irq,
IRQF_TRIGGER_NONE,
"aicl-irq", chg);
if (ret) {
dev_err_probe(dev, ret, "Failed to Request aicl IRQ\n");
goto destroy_wq;
}
ret = max77705_charger_enable(chg);
if (ret) {
dev_err_probe(dev, ret, "failed to enable charge\n");
goto destroy_wq;
}
return devm_add_action_or_reset(dev, max77705_charger_disable, chg);
destroy_wq:
destroy_workqueue(chg->wqueue);
return ret;
}
static const struct of_device_id max77705_charger_of_match[] = {
{ .compatible = "maxim,max77705-charger" },
{ }
};
MODULE_DEVICE_TABLE(of, max77705_charger_of_match);
static struct i2c_driver max77705_charger_driver = {
.driver = {
.name = "max77705-charger",
.of_match_table = max77705_charger_of_match,
},
.probe = max77705_charger_probe,
};
module_i2c_driver(max77705_charger_driver);
MODULE_AUTHOR("Dzmitry Sankouski <dsankouski@gmail.com>");
MODULE_DESCRIPTION("Maxim MAX77705 charger driver");
MODULE_LICENSE("GPL");
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