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/*
* 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 <lockwood@android.com>
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#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>
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))
/*
* Temporary variable used between goldfish_battery_probe() and
* goldfish_battery_open().
*/
static struct goldfish_battery_data *battery_data;
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_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 = container_of(psy,
struct goldfish_battery_data, ac);
int ret = 0;
switch (psp) {
case POWER_SUPPLY_PROP_ONLINE:
val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_AC_ONLINE);
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 = container_of(psy,
struct goldfish_battery_data, battery);
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;
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,
};
static enum power_supply_property goldfish_ac_props[] = {
POWER_SUPPLY_PROP_ONLINE,
};
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 int goldfish_battery_probe(struct platform_device *pdev)
{
int ret;
struct resource *r;
struct goldfish_battery_data *data;
data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
if (data == NULL)
return -ENOMEM;
spin_lock_init(&data->lock);
data->battery.properties = goldfish_battery_props;
data->battery.num_properties = ARRAY_SIZE(goldfish_battery_props);
data->battery.get_property = goldfish_battery_get_property;
data->battery.name = "battery";
data->battery.type = POWER_SUPPLY_TYPE_BATTERY;
data->ac.properties = goldfish_ac_props;
data->ac.num_properties = ARRAY_SIZE(goldfish_ac_props);
data->ac.get_property = goldfish_ac_get_property;
data->ac.name = "ac";
data->ac.type = POWER_SUPPLY_TYPE_MAINS;
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) {
dev_err(&pdev->dev, "platform_get_irq failed\n");
return -ENODEV;
}
ret = devm_request_irq(&pdev->dev, data->irq, goldfish_battery_interrupt,
IRQF_SHARED, pdev->name, data);
if (ret)
return ret;
ret = power_supply_register(&pdev->dev, &data->ac, NULL);
if (ret)
return ret;
ret = power_supply_register(&pdev->dev, &data->battery, NULL);
if (ret) {
power_supply_unregister(&data->ac);
return ret;
}
platform_set_drvdata(pdev, data);
battery_data = data;
GOLDFISH_BATTERY_WRITE(data, BATTERY_INT_ENABLE, BATTERY_INT_MASK);
return 0;
}
static int goldfish_battery_remove(struct platform_device *pdev)
{
struct goldfish_battery_data *data = platform_get_drvdata(pdev);
power_supply_unregister(&data->battery);
power_supply_unregister(&data->ac);
battery_data = NULL;
return 0;
}
static struct platform_driver goldfish_battery_device = {
.probe = goldfish_battery_probe,
.remove = goldfish_battery_remove,
.driver = {
.name = "goldfish-battery"
}
};
module_platform_driver(goldfish_battery_device);
MODULE_AUTHOR("Mike Lockwood lockwood@android.com");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Battery driver for the Goldfish emulator");
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