swh:1:snp:c2847dfd741eae21606027cf29250d1ebcd63fb4
Tip revision: d8a5b80568a9cb66810e75b182018e9edb68e8ff authored by Linus Torvalds on 28 January 2018, 21:20:33 UTC
Linux 4.15
Linux 4.15
Tip revision: d8a5b80
nvec_power.c
/*
* 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>
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
*/
#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");