// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2022-2024, Linaro Ltd
* Authors:
* Bjorn Andersson
* Dmitry Baryshkov
*/
#include <linux/auxiliary_bus.h>
#include <linux/bits.h>
#include <linux/cleanup.h>
#include <linux/delay.h>
#include <linux/jiffies.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/notifier.h>
#include <linux/power_supply.h>
#include <linux/platform_data/lenovo-yoga-c630.h>
struct yoga_c630_psy {
struct yoga_c630_ec *ec;
struct device *dev;
struct fwnode_handle *fwnode;
struct notifier_block nb;
/* guards all battery properties and registration of power supplies */
struct mutex lock;
struct power_supply *adp_psy;
struct power_supply *bat_psy;
unsigned long last_status_update;
bool adapter_online;
bool unit_mA;
bool bat_present;
unsigned int bat_status;
unsigned int design_capacity;
unsigned int design_voltage;
unsigned int full_charge_capacity;
unsigned int capacity_now;
unsigned int voltage_now;
int current_now;
int rate_now;
};
#define LENOVO_EC_CACHE_TIME (10 * HZ)
#define LENOVO_EC_ADPT_STATUS 0xa3
#define LENOVO_EC_ADPT_STATUS_PRESENT BIT(7)
#define LENOVO_EC_BAT_ATTRIBUTES 0xc0
#define LENOVO_EC_BAT_ATTRIBUTES_UNIT_IS_MA BIT(1)
#define LENOVO_EC_BAT_STATUS 0xc1
#define LENOVO_EC_BAT_STATUS_DISCHARGING BIT(0)
#define LENOVO_EC_BAT_STATUS_CHARGING BIT(1)
#define LENOVO_EC_BAT_REMAIN_CAPACITY 0xc2
#define LENOVO_EC_BAT_VOLTAGE 0xc6
#define LENOVO_EC_BAT_DESIGN_VOLTAGE 0xc8
#define LENOVO_EC_BAT_DESIGN_CAPACITY 0xca
#define LENOVO_EC_BAT_FULL_CAPACITY 0xcc
#define LENOVO_EC_BAT_CURRENT 0xd2
#define LENOVO_EC_BAT_FULL_FACTORY 0xd6
#define LENOVO_EC_BAT_PRESENT 0xda
#define LENOVO_EC_BAT_PRESENT_IS_PRESENT BIT(0)
#define LENOVO_EC_BAT_FULL_REGISTER 0xdb
#define LENOVO_EC_BAT_FULL_REGISTER_IS_FACTORY BIT(0)
static int yoga_c630_psy_update_bat_info(struct yoga_c630_psy *ecbat)
{
struct yoga_c630_ec *ec = ecbat->ec;
int val;
lockdep_assert_held(&ecbat->lock);
val = yoga_c630_ec_read8(ec, LENOVO_EC_BAT_PRESENT);
if (val < 0)
return val;
ecbat->bat_present = !!(val & LENOVO_EC_BAT_PRESENT_IS_PRESENT);
if (!ecbat->bat_present)
return val;
val = yoga_c630_ec_read8(ec, LENOVO_EC_BAT_ATTRIBUTES);
if (val < 0)
return val;
ecbat->unit_mA = val & LENOVO_EC_BAT_ATTRIBUTES_UNIT_IS_MA;
val = yoga_c630_ec_read16(ec, LENOVO_EC_BAT_DESIGN_CAPACITY);
if (val < 0)
return val;
ecbat->design_capacity = val * 1000;
/*
* DSDT has delays after most of EC reads in these methods.
* Having no documentation for the EC we have to follow and sleep here.
*/
msleep(50);
val = yoga_c630_ec_read16(ec, LENOVO_EC_BAT_DESIGN_VOLTAGE);
if (val < 0)
return val;
ecbat->design_voltage = val;
msleep(50);
val = yoga_c630_ec_read8(ec, LENOVO_EC_BAT_FULL_REGISTER);
if (val < 0)
return val;
val = yoga_c630_ec_read16(ec,
val & LENOVO_EC_BAT_FULL_REGISTER_IS_FACTORY ?
LENOVO_EC_BAT_FULL_FACTORY :
LENOVO_EC_BAT_FULL_CAPACITY);
if (val < 0)
return val;
ecbat->full_charge_capacity = val * 1000;
if (!ecbat->unit_mA) {
ecbat->design_capacity *= 10;
ecbat->full_charge_capacity *= 10;
}
return 0;
}
static int yoga_c630_psy_maybe_update_bat_status(struct yoga_c630_psy *ecbat)
{
struct yoga_c630_ec *ec = ecbat->ec;
int current_mA;
int val;
guard(mutex)(&ecbat->lock);
if (time_before(jiffies, ecbat->last_status_update + LENOVO_EC_CACHE_TIME))
return 0;
val = yoga_c630_ec_read8(ec, LENOVO_EC_BAT_STATUS);
if (val < 0)
return val;
ecbat->bat_status = val;
msleep(50);
val = yoga_c630_ec_read16(ec, LENOVO_EC_BAT_REMAIN_CAPACITY);
if (val < 0)
return val;
ecbat->capacity_now = val * 1000;
msleep(50);
val = yoga_c630_ec_read16(ec, LENOVO_EC_BAT_VOLTAGE);
if (val < 0)
return val;
ecbat->voltage_now = val * 1000;
msleep(50);
val = yoga_c630_ec_read16(ec, LENOVO_EC_BAT_CURRENT);
if (val < 0)
return val;
current_mA = sign_extend32(val, 15);
ecbat->current_now = current_mA * 1000;
ecbat->rate_now = current_mA * (ecbat->voltage_now / 1000);
msleep(50);
if (!ecbat->unit_mA)
ecbat->capacity_now *= 10;
ecbat->last_status_update = jiffies;
return 0;
}
static int yoga_c630_psy_update_adapter_status(struct yoga_c630_psy *ecbat)
{
struct yoga_c630_ec *ec = ecbat->ec;
int val;
guard(mutex)(&ecbat->lock);
val = yoga_c630_ec_read8(ec, LENOVO_EC_ADPT_STATUS);
if (val < 0)
return val;
ecbat->adapter_online = !!(val & LENOVO_EC_ADPT_STATUS_PRESENT);
return 0;
}
static bool yoga_c630_psy_is_charged(struct yoga_c630_psy *ecbat)
{
if (ecbat->bat_status != 0)
return false;
if (ecbat->full_charge_capacity <= ecbat->capacity_now)
return true;
if (ecbat->design_capacity <= ecbat->capacity_now)
return true;
return false;
}
static int yoga_c630_psy_bat_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
struct yoga_c630_psy *ecbat = power_supply_get_drvdata(psy);
int rc = 0;
if (!ecbat->bat_present && psp != POWER_SUPPLY_PROP_PRESENT)
return -ENODEV;
rc = yoga_c630_psy_maybe_update_bat_status(ecbat);
if (rc)
return rc;
switch (psp) {
case POWER_SUPPLY_PROP_STATUS:
if (ecbat->bat_status & LENOVO_EC_BAT_STATUS_DISCHARGING)
val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
else if (ecbat->bat_status & LENOVO_EC_BAT_STATUS_CHARGING)
val->intval = POWER_SUPPLY_STATUS_CHARGING;
else if (yoga_c630_psy_is_charged(ecbat))
val->intval = POWER_SUPPLY_STATUS_FULL;
else
val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
break;
case POWER_SUPPLY_PROP_PRESENT:
val->intval = ecbat->bat_present;
break;
case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
val->intval = ecbat->design_voltage;
break;
case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
val->intval = ecbat->design_capacity;
break;
case POWER_SUPPLY_PROP_CHARGE_FULL:
case POWER_SUPPLY_PROP_ENERGY_FULL:
val->intval = ecbat->full_charge_capacity;
break;
case POWER_SUPPLY_PROP_CHARGE_NOW:
case POWER_SUPPLY_PROP_ENERGY_NOW:
val->intval = ecbat->capacity_now;
break;
case POWER_SUPPLY_PROP_CURRENT_NOW:
val->intval = ecbat->current_now;
break;
case POWER_SUPPLY_PROP_POWER_NOW:
val->intval = ecbat->rate_now;
break;
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
val->intval = ecbat->voltage_now;
break;
case POWER_SUPPLY_PROP_TECHNOLOGY:
val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
break;
case POWER_SUPPLY_PROP_MODEL_NAME:
val->strval = "PABAS0241231";
break;
case POWER_SUPPLY_PROP_MANUFACTURER:
val->strval = "Compal";
break;
case POWER_SUPPLY_PROP_SCOPE:
val->intval = POWER_SUPPLY_SCOPE_SYSTEM;
break;
default:
rc = -EINVAL;
break;
}
return rc;
}
static enum power_supply_property yoga_c630_psy_bat_mA_properties[] = {
POWER_SUPPLY_PROP_STATUS,
POWER_SUPPLY_PROP_PRESENT,
POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
POWER_SUPPLY_PROP_CHARGE_FULL,
POWER_SUPPLY_PROP_CHARGE_NOW,
POWER_SUPPLY_PROP_CURRENT_NOW,
POWER_SUPPLY_PROP_POWER_NOW,
POWER_SUPPLY_PROP_VOLTAGE_NOW,
POWER_SUPPLY_PROP_TECHNOLOGY,
POWER_SUPPLY_PROP_MODEL_NAME,
POWER_SUPPLY_PROP_MANUFACTURER,
POWER_SUPPLY_PROP_SCOPE,
};
static enum power_supply_property yoga_c630_psy_bat_mWh_properties[] = {
POWER_SUPPLY_PROP_STATUS,
POWER_SUPPLY_PROP_PRESENT,
POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
POWER_SUPPLY_PROP_ENERGY_FULL,
POWER_SUPPLY_PROP_ENERGY_NOW,
POWER_SUPPLY_PROP_CURRENT_NOW,
POWER_SUPPLY_PROP_POWER_NOW,
POWER_SUPPLY_PROP_VOLTAGE_NOW,
POWER_SUPPLY_PROP_TECHNOLOGY,
POWER_SUPPLY_PROP_MODEL_NAME,
POWER_SUPPLY_PROP_MANUFACTURER,
POWER_SUPPLY_PROP_SCOPE,
};
static const struct power_supply_desc yoga_c630_psy_bat_psy_desc_mA = {
.name = "yoga-c630-battery",
.type = POWER_SUPPLY_TYPE_BATTERY,
.properties = yoga_c630_psy_bat_mA_properties,
.num_properties = ARRAY_SIZE(yoga_c630_psy_bat_mA_properties),
.get_property = yoga_c630_psy_bat_get_property,
};
static const struct power_supply_desc yoga_c630_psy_bat_psy_desc_mWh = {
.name = "yoga-c630-battery",
.type = POWER_SUPPLY_TYPE_BATTERY,
.properties = yoga_c630_psy_bat_mWh_properties,
.num_properties = ARRAY_SIZE(yoga_c630_psy_bat_mWh_properties),
.get_property = yoga_c630_psy_bat_get_property,
};
static int yoga_c630_psy_adpt_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
struct yoga_c630_psy *ecbat = power_supply_get_drvdata(psy);
int ret = 0;
ret = yoga_c630_psy_update_adapter_status(ecbat);
if (ret < 0)
return ret;
switch (psp) {
case POWER_SUPPLY_PROP_ONLINE:
val->intval = ecbat->adapter_online;
break;
case POWER_SUPPLY_PROP_USB_TYPE:
val->intval = POWER_SUPPLY_USB_TYPE_C;
break;
default:
return -EINVAL;
}
return 0;
}
static enum power_supply_property yoga_c630_psy_adpt_properties[] = {
POWER_SUPPLY_PROP_ONLINE,
POWER_SUPPLY_PROP_USB_TYPE,
};
static const struct power_supply_desc yoga_c630_psy_adpt_psy_desc = {
.name = "yoga-c630-adapter",
.type = POWER_SUPPLY_TYPE_USB,
.usb_types = BIT(POWER_SUPPLY_USB_TYPE_C),
.properties = yoga_c630_psy_adpt_properties,
.num_properties = ARRAY_SIZE(yoga_c630_psy_adpt_properties),
.get_property = yoga_c630_psy_adpt_get_property,
};
static int yoga_c630_psy_register_bat_psy(struct yoga_c630_psy *ecbat)
{
struct power_supply_config bat_cfg = {};
bat_cfg.drv_data = ecbat;
bat_cfg.fwnode = ecbat->fwnode;
ecbat->bat_psy = power_supply_register_no_ws(ecbat->dev,
ecbat->unit_mA ?
&yoga_c630_psy_bat_psy_desc_mA :
&yoga_c630_psy_bat_psy_desc_mWh,
&bat_cfg);
if (IS_ERR(ecbat->bat_psy)) {
dev_err(ecbat->dev, "failed to register battery supply\n");
return PTR_ERR(ecbat->bat_psy);
}
return 0;
}
static void yoga_c630_ec_refresh_bat_info(struct yoga_c630_psy *ecbat)
{
bool current_unit;
guard(mutex)(&ecbat->lock);
current_unit = ecbat->unit_mA;
yoga_c630_psy_update_bat_info(ecbat);
if (current_unit != ecbat->unit_mA) {
power_supply_unregister(ecbat->bat_psy);
yoga_c630_psy_register_bat_psy(ecbat);
}
}
static int yoga_c630_psy_notify(struct notifier_block *nb,
unsigned long action, void *data)
{
struct yoga_c630_psy *ecbat = container_of(nb, struct yoga_c630_psy, nb);
switch (action) {
case LENOVO_EC_EVENT_BAT_INFO:
yoga_c630_ec_refresh_bat_info(ecbat);
break;
case LENOVO_EC_EVENT_BAT_ADPT_STATUS:
power_supply_changed(ecbat->adp_psy);
fallthrough;
case LENOVO_EC_EVENT_BAT_STATUS:
power_supply_changed(ecbat->bat_psy);
break;
}
return NOTIFY_OK;
}
static int yoga_c630_psy_probe(struct auxiliary_device *adev,
const struct auxiliary_device_id *id)
{
struct yoga_c630_ec *ec = adev->dev.platform_data;
struct power_supply_config adp_cfg = {};
struct device *dev = &adev->dev;
struct yoga_c630_psy *ecbat;
int ret;
ecbat = devm_kzalloc(&adev->dev, sizeof(*ecbat), GFP_KERNEL);
if (!ecbat)
return -ENOMEM;
ecbat->ec = ec;
ecbat->dev = dev;
mutex_init(&ecbat->lock);
ecbat->fwnode = adev->dev.parent->fwnode;
ecbat->nb.notifier_call = yoga_c630_psy_notify;
auxiliary_set_drvdata(adev, ecbat);
adp_cfg.drv_data = ecbat;
adp_cfg.fwnode = ecbat->fwnode;
adp_cfg.supplied_to = (char **)&yoga_c630_psy_bat_psy_desc_mA.name;
adp_cfg.num_supplicants = 1;
ecbat->adp_psy = devm_power_supply_register_no_ws(dev, &yoga_c630_psy_adpt_psy_desc, &adp_cfg);
if (IS_ERR(ecbat->adp_psy)) {
dev_err(dev, "failed to register AC adapter supply\n");
return PTR_ERR(ecbat->adp_psy);
}
scoped_guard(mutex, &ecbat->lock) {
ret = yoga_c630_psy_update_bat_info(ecbat);
if (ret)
goto err_unreg_bat;
ret = yoga_c630_psy_register_bat_psy(ecbat);
if (ret)
goto err_unreg_bat;
}
ret = yoga_c630_ec_register_notify(ecbat->ec, &ecbat->nb);
if (ret)
goto err_unreg_bat;
return 0;
err_unreg_bat:
power_supply_unregister(ecbat->bat_psy);
return ret;
}
static void yoga_c630_psy_remove(struct auxiliary_device *adev)
{
struct yoga_c630_psy *ecbat = auxiliary_get_drvdata(adev);
yoga_c630_ec_unregister_notify(ecbat->ec, &ecbat->nb);
power_supply_unregister(ecbat->bat_psy);
}
static const struct auxiliary_device_id yoga_c630_psy_id_table[] = {
{ .name = YOGA_C630_MOD_NAME "." YOGA_C630_DEV_PSY, },
{}
};
MODULE_DEVICE_TABLE(auxiliary, yoga_c630_psy_id_table);
static struct auxiliary_driver yoga_c630_psy_driver = {
.name = YOGA_C630_DEV_PSY,
.id_table = yoga_c630_psy_id_table,
.probe = yoga_c630_psy_probe,
.remove = yoga_c630_psy_remove,
};
module_auxiliary_driver(yoga_c630_psy_driver);
MODULE_DESCRIPTION("Lenovo Yoga C630 psy");
MODULE_LICENSE("GPL");
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