// SPDX-License-Identifier: GPL-2.0
/*
* Power supply driver for the goldfish emulator
*
* Copyright (C) 2008 Google, Inc.
* Copyright (C) 2012 Intel, Inc.
* Copyright (C) 2013 Intel, Inc.
* Author: Mike Lockwood <[email protected]>
*/
#include <linux/module.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/acpi.h>
struct goldfish_battery_data {
void __iomem *reg_base;
int irq;
spinlock_t lock;
struct power_supply *battery;
struct power_supply *ac;
};
#define GOLDFISH_BATTERY_READ(data, addr) \
(readl(data->reg_base + addr))
#define GOLDFISH_BATTERY_WRITE(data, addr, x) \
(writel(x, data->reg_base + addr))
enum {
/* status register */
BATTERY_INT_STATUS = 0x00,
/* set this to enable IRQ */
BATTERY_INT_ENABLE = 0x04,
BATTERY_AC_ONLINE = 0x08,
BATTERY_STATUS = 0x0C,
BATTERY_HEALTH = 0x10,
BATTERY_PRESENT = 0x14,
BATTERY_CAPACITY = 0x18,
BATTERY_VOLTAGE = 0x1C,
BATTERY_TEMP = 0x20,
BATTERY_CHARGE_COUNTER = 0x24,
BATTERY_VOLTAGE_MAX = 0x28,
BATTERY_CURRENT_MAX = 0x2C,
BATTERY_CURRENT_NOW = 0x30,
BATTERY_CURRENT_AVG = 0x34,
BATTERY_CHARGE_FULL_UAH = 0x38,
BATTERY_CYCLE_COUNT = 0x40,
BATTERY_STATUS_CHANGED = 1U << 0,
AC_STATUS_CHANGED = 1U << 1,
BATTERY_INT_MASK = BATTERY_STATUS_CHANGED | AC_STATUS_CHANGED,
};
static int goldfish_ac_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
struct goldfish_battery_data *data = power_supply_get_drvdata(psy);
int ret = 0;
switch (psp) {
case POWER_SUPPLY_PROP_ONLINE:
val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_AC_ONLINE);
break;
case POWER_SUPPLY_PROP_VOLTAGE_MAX:
val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_VOLTAGE_MAX);
break;
case POWER_SUPPLY_PROP_CURRENT_MAX:
val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_CURRENT_MAX);
break;
default:
ret = -EINVAL;
break;
}
return ret;
}
static int goldfish_battery_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
struct goldfish_battery_data *data = power_supply_get_drvdata(psy);
int ret = 0;
switch (psp) {
case POWER_SUPPLY_PROP_STATUS:
val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_STATUS);
break;
case POWER_SUPPLY_PROP_HEALTH:
val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_HEALTH);
break;
case POWER_SUPPLY_PROP_PRESENT:
val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_PRESENT);
break;
case POWER_SUPPLY_PROP_TECHNOLOGY:
val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
break;
case POWER_SUPPLY_PROP_CAPACITY:
val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_CAPACITY);
break;
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_VOLTAGE);
break;
case POWER_SUPPLY_PROP_TEMP:
val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_TEMP);
break;
case POWER_SUPPLY_PROP_CHARGE_COUNTER:
val->intval = GOLDFISH_BATTERY_READ(data,
BATTERY_CHARGE_COUNTER);
break;
case POWER_SUPPLY_PROP_CURRENT_NOW:
val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_CURRENT_NOW);
break;
case POWER_SUPPLY_PROP_CURRENT_AVG:
val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_CURRENT_AVG);
break;
case POWER_SUPPLY_PROP_CHARGE_FULL:
val->intval = GOLDFISH_BATTERY_READ(data,
BATTERY_CHARGE_FULL_UAH);
break;
case POWER_SUPPLY_PROP_CYCLE_COUNT:
val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_CYCLE_COUNT);
break;
default:
ret = -EINVAL;
break;
}
return ret;
}
static enum power_supply_property goldfish_battery_props[] = {
POWER_SUPPLY_PROP_STATUS,
POWER_SUPPLY_PROP_HEALTH,
POWER_SUPPLY_PROP_PRESENT,
POWER_SUPPLY_PROP_TECHNOLOGY,
POWER_SUPPLY_PROP_CAPACITY,
POWER_SUPPLY_PROP_VOLTAGE_NOW,
POWER_SUPPLY_PROP_TEMP,
POWER_SUPPLY_PROP_CHARGE_COUNTER,
POWER_SUPPLY_PROP_CURRENT_NOW,
POWER_SUPPLY_PROP_CURRENT_AVG,
POWER_SUPPLY_PROP_CHARGE_FULL,
POWER_SUPPLY_PROP_CYCLE_COUNT,
};
static enum power_supply_property goldfish_ac_props[] = {
POWER_SUPPLY_PROP_ONLINE,
POWER_SUPPLY_PROP_VOLTAGE_MAX,
POWER_SUPPLY_PROP_CURRENT_MAX,
};
static irqreturn_t goldfish_battery_interrupt(int irq, void *dev_id)
{
unsigned long irq_flags;
struct goldfish_battery_data *data = dev_id;
uint32_t status;
spin_lock_irqsave(&data->lock, irq_flags);
/* read status flags, which will clear the interrupt */
status = GOLDFISH_BATTERY_READ(data, BATTERY_INT_STATUS);
status &= BATTERY_INT_MASK;
if (status & BATTERY_STATUS_CHANGED)
power_supply_changed(data->battery);
if (status & AC_STATUS_CHANGED)
power_supply_changed(data->ac);
spin_unlock_irqrestore(&data->lock, irq_flags);
return status ? IRQ_HANDLED : IRQ_NONE;
}
static const struct power_supply_desc battery_desc = {
.properties = goldfish_battery_props,
.num_properties = ARRAY_SIZE(goldfish_battery_props),
.get_property = goldfish_battery_get_property,
.name = "battery",
.type = POWER_SUPPLY_TYPE_BATTERY,
};
static const struct power_supply_desc ac_desc = {
.properties = goldfish_ac_props,
.num_properties = ARRAY_SIZE(goldfish_ac_props),
.get_property = goldfish_ac_get_property,
.name = "ac",
.type = POWER_SUPPLY_TYPE_MAINS,
};
static int goldfish_battery_probe(struct platform_device *pdev)
{
int ret;
struct resource *r;
struct goldfish_battery_data *data;
struct power_supply_config psy_cfg = {};
data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
if (data == NULL)
return -ENOMEM;
spin_lock_init(&data->lock);
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (r == NULL) {
dev_err(&pdev->dev, "platform_get_resource failed\n");
return -ENODEV;
}
data->reg_base = devm_ioremap(&pdev->dev, r->start, resource_size(r));
if (data->reg_base == NULL) {
dev_err(&pdev->dev, "unable to remap MMIO\n");
return -ENOMEM;
}
data->irq = platform_get_irq(pdev, 0);
if (data->irq < 0)
return -ENODEV;
ret = devm_request_irq(&pdev->dev, data->irq,
goldfish_battery_interrupt,
IRQF_SHARED, pdev->name, data);
if (ret)
return ret;
psy_cfg.drv_data = data;
data->ac = devm_power_supply_register(&pdev->dev,
&ac_desc,
&psy_cfg);
if (IS_ERR(data->ac))
return PTR_ERR(data->ac);
data->battery = devm_power_supply_register(&pdev->dev,
&battery_desc,
&psy_cfg);
if (IS_ERR(data->battery))
return PTR_ERR(data->battery);
GOLDFISH_BATTERY_WRITE(data, BATTERY_INT_ENABLE, BATTERY_INT_MASK);
return 0;
}
static const struct of_device_id goldfish_battery_of_match[] = {
{ .compatible = "google,goldfish-battery", },
{},
};
MODULE_DEVICE_TABLE(of, goldfish_battery_of_match);
#ifdef CONFIG_ACPI
static const struct acpi_device_id goldfish_battery_acpi_match[] = {
{ "GFSH0001", 0 },
{ },
};
MODULE_DEVICE_TABLE(acpi, goldfish_battery_acpi_match);
#endif
static struct platform_driver goldfish_battery_device = {
.probe = goldfish_battery_probe,
.driver = {
.name = "goldfish-battery",
.of_match_table = goldfish_battery_of_match,
.acpi_match_table = ACPI_PTR(goldfish_battery_acpi_match),
}
};
module_platform_driver(goldfish_battery_device);
MODULE_AUTHOR("Mike Lockwood [email protected]");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Battery driver for the Goldfish emulator");
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