// SPDX-License-Identifier: GPL-2.0
|
/*
|
* nvec_power: power supply driver for a NVIDIA compliant embedded controller
|
*
|
* Copyright (C) 2011 The AC100 Kernel Team <ac100@lists.launchpad.net>
|
*
|
* Authors: Ilya Petrov <ilya.muromec@gmail.com>
|
* Marc Dietrich <marvin24@gmx.de>
|
*/
|
|
#include <linux/module.h>
|
#include <linux/platform_device.h>
|
#include <linux/err.h>
|
#include <linux/power_supply.h>
|
#include <linux/slab.h>
|
#include <linux/workqueue.h>
|
#include <linux/delay.h>
|
|
#include "nvec.h"
|
|
#define GET_SYSTEM_STATUS 0x00
|
|
struct nvec_power {
|
struct notifier_block notifier;
|
struct delayed_work poller;
|
struct nvec_chip *nvec;
|
int on;
|
int bat_present;
|
int bat_status;
|
int bat_voltage_now;
|
int bat_current_now;
|
int bat_current_avg;
|
int time_remain;
|
int charge_full_design;
|
int charge_last_full;
|
int critical_capacity;
|
int capacity_remain;
|
int bat_temperature;
|
int bat_cap;
|
int bat_type_enum;
|
char bat_manu[30];
|
char bat_model[30];
|
char bat_type[30];
|
};
|
|
enum {
|
SLOT_STATUS,
|
VOLTAGE,
|
TIME_REMAINING,
|
CURRENT,
|
AVERAGE_CURRENT,
|
AVERAGING_TIME_INTERVAL,
|
CAPACITY_REMAINING,
|
LAST_FULL_CHARGE_CAPACITY,
|
DESIGN_CAPACITY,
|
CRITICAL_CAPACITY,
|
TEMPERATURE,
|
MANUFACTURER,
|
MODEL,
|
TYPE,
|
};
|
|
enum {
|
AC,
|
BAT,
|
};
|
|
struct bat_response {
|
u8 event_type;
|
u8 length;
|
u8 sub_type;
|
u8 status;
|
/* payload */
|
union {
|
char plc[30];
|
u16 plu;
|
s16 pls;
|
};
|
};
|
|
static struct power_supply *nvec_bat_psy;
|
static struct power_supply *nvec_psy;
|
|
static int nvec_power_notifier(struct notifier_block *nb,
|
unsigned long event_type, void *data)
|
{
|
struct nvec_power *power =
|
container_of(nb, struct nvec_power, notifier);
|
struct bat_response *res = data;
|
|
if (event_type != NVEC_SYS)
|
return NOTIFY_DONE;
|
|
if (res->sub_type == 0) {
|
if (power->on != res->plu) {
|
power->on = res->plu;
|
power_supply_changed(nvec_psy);
|
}
|
return NOTIFY_STOP;
|
}
|
return NOTIFY_OK;
|
}
|
|
static const int bat_init[] = {
|
LAST_FULL_CHARGE_CAPACITY, DESIGN_CAPACITY, CRITICAL_CAPACITY,
|
MANUFACTURER, MODEL, TYPE,
|
};
|
|
static void get_bat_mfg_data(struct nvec_power *power)
|
{
|
int i;
|
char buf[] = { NVEC_BAT, SLOT_STATUS };
|
|
for (i = 0; i < ARRAY_SIZE(bat_init); i++) {
|
buf[1] = bat_init[i];
|
nvec_write_async(power->nvec, buf, 2);
|
}
|
}
|
|
static int nvec_power_bat_notifier(struct notifier_block *nb,
|
unsigned long event_type, void *data)
|
{
|
struct nvec_power *power =
|
container_of(nb, struct nvec_power, notifier);
|
struct bat_response *res = data;
|
int status_changed = 0;
|
|
if (event_type != NVEC_BAT)
|
return NOTIFY_DONE;
|
|
switch (res->sub_type) {
|
case SLOT_STATUS:
|
if (res->plc[0] & 1) {
|
if (power->bat_present == 0) {
|
status_changed = 1;
|
get_bat_mfg_data(power);
|
}
|
|
power->bat_present = 1;
|
|
switch ((res->plc[0] >> 1) & 3) {
|
case 0:
|
power->bat_status =
|
POWER_SUPPLY_STATUS_NOT_CHARGING;
|
break;
|
case 1:
|
power->bat_status =
|
POWER_SUPPLY_STATUS_CHARGING;
|
break;
|
case 2:
|
power->bat_status =
|
POWER_SUPPLY_STATUS_DISCHARGING;
|
break;
|
default:
|
power->bat_status = POWER_SUPPLY_STATUS_UNKNOWN;
|
}
|
} else {
|
if (power->bat_present == 1)
|
status_changed = 1;
|
|
power->bat_present = 0;
|
power->bat_status = POWER_SUPPLY_STATUS_UNKNOWN;
|
}
|
power->bat_cap = res->plc[1];
|
if (status_changed)
|
power_supply_changed(nvec_bat_psy);
|
break;
|
case VOLTAGE:
|
power->bat_voltage_now = res->plu * 1000;
|
break;
|
case TIME_REMAINING:
|
power->time_remain = res->plu * 3600;
|
break;
|
case CURRENT:
|
power->bat_current_now = res->pls * 1000;
|
break;
|
case AVERAGE_CURRENT:
|
power->bat_current_avg = res->pls * 1000;
|
break;
|
case CAPACITY_REMAINING:
|
power->capacity_remain = res->plu * 1000;
|
break;
|
case LAST_FULL_CHARGE_CAPACITY:
|
power->charge_last_full = res->plu * 1000;
|
break;
|
case DESIGN_CAPACITY:
|
power->charge_full_design = res->plu * 1000;
|
break;
|
case CRITICAL_CAPACITY:
|
power->critical_capacity = res->plu * 1000;
|
break;
|
case TEMPERATURE:
|
power->bat_temperature = res->plu - 2732;
|
break;
|
case MANUFACTURER:
|
memcpy(power->bat_manu, &res->plc, res->length - 2);
|
power->bat_model[res->length - 2] = '\0';
|
break;
|
case MODEL:
|
memcpy(power->bat_model, &res->plc, res->length - 2);
|
power->bat_model[res->length - 2] = '\0';
|
break;
|
case TYPE:
|
memcpy(power->bat_type, &res->plc, res->length - 2);
|
power->bat_type[res->length - 2] = '\0';
|
/*
|
* This differs a little from the spec fill in more if you find
|
* some.
|
*/
|
if (!strncmp(power->bat_type, "Li", 30))
|
power->bat_type_enum = POWER_SUPPLY_TECHNOLOGY_LION;
|
else
|
power->bat_type_enum = POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
|
break;
|
default:
|
return NOTIFY_STOP;
|
}
|
|
return NOTIFY_STOP;
|
}
|
|
static int nvec_power_get_property(struct power_supply *psy,
|
enum power_supply_property psp,
|
union power_supply_propval *val)
|
{
|
struct nvec_power *power = dev_get_drvdata(psy->dev.parent);
|
|
switch (psp) {
|
case POWER_SUPPLY_PROP_ONLINE:
|
val->intval = power->on;
|
break;
|
default:
|
return -EINVAL;
|
}
|
return 0;
|
}
|
|
static int nvec_battery_get_property(struct power_supply *psy,
|
enum power_supply_property psp,
|
union power_supply_propval *val)
|
{
|
struct nvec_power *power = dev_get_drvdata(psy->dev.parent);
|
|
switch (psp) {
|
case POWER_SUPPLY_PROP_STATUS:
|
val->intval = power->bat_status;
|
break;
|
case POWER_SUPPLY_PROP_CAPACITY:
|
val->intval = power->bat_cap;
|
break;
|
case POWER_SUPPLY_PROP_PRESENT:
|
val->intval = power->bat_present;
|
break;
|
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
|
val->intval = power->bat_voltage_now;
|
break;
|
case POWER_SUPPLY_PROP_CURRENT_NOW:
|
val->intval = power->bat_current_now;
|
break;
|
case POWER_SUPPLY_PROP_CURRENT_AVG:
|
val->intval = power->bat_current_avg;
|
break;
|
case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
|
val->intval = power->time_remain;
|
break;
|
case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
|
val->intval = power->charge_full_design;
|
break;
|
case POWER_SUPPLY_PROP_CHARGE_FULL:
|
val->intval = power->charge_last_full;
|
break;
|
case POWER_SUPPLY_PROP_CHARGE_EMPTY:
|
val->intval = power->critical_capacity;
|
break;
|
case POWER_SUPPLY_PROP_CHARGE_NOW:
|
val->intval = power->capacity_remain;
|
break;
|
case POWER_SUPPLY_PROP_TEMP:
|
val->intval = power->bat_temperature;
|
break;
|
case POWER_SUPPLY_PROP_MANUFACTURER:
|
val->strval = power->bat_manu;
|
break;
|
case POWER_SUPPLY_PROP_MODEL_NAME:
|
val->strval = power->bat_model;
|
break;
|
case POWER_SUPPLY_PROP_TECHNOLOGY:
|
val->intval = power->bat_type_enum;
|
break;
|
default:
|
return -EINVAL;
|
}
|
return 0;
|
}
|
|
static enum power_supply_property nvec_power_props[] = {
|
POWER_SUPPLY_PROP_ONLINE,
|
};
|
|
static enum power_supply_property nvec_battery_props[] = {
|
POWER_SUPPLY_PROP_STATUS,
|
POWER_SUPPLY_PROP_PRESENT,
|
POWER_SUPPLY_PROP_CAPACITY,
|
POWER_SUPPLY_PROP_VOLTAGE_NOW,
|
POWER_SUPPLY_PROP_CURRENT_NOW,
|
#ifdef EC_FULL_DIAG
|
POWER_SUPPLY_PROP_CURRENT_AVG,
|
POWER_SUPPLY_PROP_TEMP,
|
POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
|
#endif
|
POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
|
POWER_SUPPLY_PROP_CHARGE_FULL,
|
POWER_SUPPLY_PROP_CHARGE_EMPTY,
|
POWER_SUPPLY_PROP_CHARGE_NOW,
|
POWER_SUPPLY_PROP_MANUFACTURER,
|
POWER_SUPPLY_PROP_MODEL_NAME,
|
POWER_SUPPLY_PROP_TECHNOLOGY,
|
};
|
|
static char *nvec_power_supplied_to[] = {
|
"battery",
|
};
|
|
static const struct power_supply_desc nvec_bat_psy_desc = {
|
.name = "battery",
|
.type = POWER_SUPPLY_TYPE_BATTERY,
|
.properties = nvec_battery_props,
|
.num_properties = ARRAY_SIZE(nvec_battery_props),
|
.get_property = nvec_battery_get_property,
|
};
|
|
static const struct power_supply_desc nvec_psy_desc = {
|
.name = "ac",
|
.type = POWER_SUPPLY_TYPE_MAINS,
|
.properties = nvec_power_props,
|
.num_properties = ARRAY_SIZE(nvec_power_props),
|
.get_property = nvec_power_get_property,
|
};
|
|
static int counter;
|
static int const bat_iter[] = {
|
SLOT_STATUS, VOLTAGE, CURRENT, CAPACITY_REMAINING,
|
#ifdef EC_FULL_DIAG
|
AVERAGE_CURRENT, TEMPERATURE, TIME_REMAINING,
|
#endif
|
};
|
|
static void nvec_power_poll(struct work_struct *work)
|
{
|
char buf[] = { NVEC_SYS, GET_SYSTEM_STATUS };
|
struct nvec_power *power = container_of(work, struct nvec_power,
|
poller.work);
|
|
if (counter >= ARRAY_SIZE(bat_iter))
|
counter = 0;
|
|
/* AC status via sys req */
|
nvec_write_async(power->nvec, buf, 2);
|
msleep(100);
|
|
/*
|
* Select a battery request function via round robin doing it all at
|
* once seems to overload the power supply.
|
*/
|
buf[0] = NVEC_BAT;
|
buf[1] = bat_iter[counter++];
|
nvec_write_async(power->nvec, buf, 2);
|
|
schedule_delayed_work(to_delayed_work(work), msecs_to_jiffies(5000));
|
};
|
|
static int nvec_power_probe(struct platform_device *pdev)
|
{
|
struct power_supply **psy;
|
const struct power_supply_desc *psy_desc;
|
struct nvec_power *power;
|
struct nvec_chip *nvec = dev_get_drvdata(pdev->dev.parent);
|
struct power_supply_config psy_cfg = {};
|
|
power = devm_kzalloc(&pdev->dev, sizeof(struct nvec_power), GFP_NOWAIT);
|
if (!power)
|
return -ENOMEM;
|
|
dev_set_drvdata(&pdev->dev, power);
|
power->nvec = nvec;
|
|
switch (pdev->id) {
|
case AC:
|
psy = &nvec_psy;
|
psy_desc = &nvec_psy_desc;
|
psy_cfg.supplied_to = nvec_power_supplied_to;
|
psy_cfg.num_supplicants = ARRAY_SIZE(nvec_power_supplied_to);
|
|
power->notifier.notifier_call = nvec_power_notifier;
|
|
INIT_DELAYED_WORK(&power->poller, nvec_power_poll);
|
schedule_delayed_work(&power->poller, msecs_to_jiffies(5000));
|
break;
|
case BAT:
|
psy = &nvec_bat_psy;
|
psy_desc = &nvec_bat_psy_desc;
|
|
power->notifier.notifier_call = nvec_power_bat_notifier;
|
break;
|
default:
|
return -ENODEV;
|
}
|
|
nvec_register_notifier(nvec, &power->notifier, NVEC_SYS);
|
|
if (pdev->id == BAT)
|
get_bat_mfg_data(power);
|
|
*psy = power_supply_register(&pdev->dev, psy_desc, &psy_cfg);
|
|
return PTR_ERR_OR_ZERO(*psy);
|
}
|
|
static int nvec_power_remove(struct platform_device *pdev)
|
{
|
struct nvec_power *power = platform_get_drvdata(pdev);
|
|
cancel_delayed_work_sync(&power->poller);
|
nvec_unregister_notifier(power->nvec, &power->notifier);
|
switch (pdev->id) {
|
case AC:
|
power_supply_unregister(nvec_psy);
|
break;
|
case BAT:
|
power_supply_unregister(nvec_bat_psy);
|
}
|
|
return 0;
|
}
|
|
static struct platform_driver nvec_power_driver = {
|
.probe = nvec_power_probe,
|
.remove = nvec_power_remove,
|
.driver = {
|
.name = "nvec-power",
|
}
|
};
|
|
module_platform_driver(nvec_power_driver);
|
|
MODULE_AUTHOR("Ilya Petrov <ilya.muromec@gmail.com>");
|
MODULE_LICENSE("GPL");
|
MODULE_DESCRIPTION("NVEC battery and AC driver");
|
MODULE_ALIAS("platform:nvec-power");
|
