pmu_battery.c
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/*
* Battery class driver for Apple PMU
*
* Copyright © 2006 David Woodhouse <dwmw2@infradead.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/err.h>
#include <linux/power_supply.h>
#include <linux/adb.h>
#include <linux/pmu.h>
#include <linux/slab.h>
static struct pmu_battery_dev {
struct power_supply bat;
struct pmu_battery_info *pbi;
char name[16];
int propval;
} *pbats[PMU_MAX_BATTERIES];
#define to_pmu_battery_dev(x) container_of(x, struct pmu_battery_dev, bat)
/*********************************************************************
* Power
*********************************************************************/
static int pmu_get_ac_prop(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
switch (psp) {
case POWER_SUPPLY_PROP_ONLINE:
val->intval = (!!(pmu_power_flags & PMU_PWR_AC_PRESENT)) ||
(pmu_battery_count == 0);
break;
default:
return -EINVAL;
}
return 0;
}
static enum power_supply_property pmu_ac_props[] = {
POWER_SUPPLY_PROP_ONLINE,
};
static struct power_supply pmu_ac = {
.name = "pmu-ac",
.type = POWER_SUPPLY_TYPE_MAINS,
.properties = pmu_ac_props,
.num_properties = ARRAY_SIZE(pmu_ac_props),
.get_property = pmu_get_ac_prop,
};
/*********************************************************************
* Battery properties
*********************************************************************/
static char *pmu_batt_types[] = {
"Smart", "Comet", "Hooper", "Unknown"
};
static char *pmu_bat_get_model_name(struct pmu_battery_info *pbi)
{
switch (pbi->flags & PMU_BATT_TYPE_MASK) {
case PMU_BATT_TYPE_SMART:
return pmu_batt_types[0];
case PMU_BATT_TYPE_COMET:
return pmu_batt_types[1];
case PMU_BATT_TYPE_HOOPER:
return pmu_batt_types[2];
default: break;
}
return pmu_batt_types[3];
}
static int pmu_bat_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
struct pmu_battery_dev *pbat = to_pmu_battery_dev(psy);
struct pmu_battery_info *pbi = pbat->pbi;
switch (psp) {
case POWER_SUPPLY_PROP_STATUS:
if (pbi->flags & PMU_BATT_CHARGING)
val->intval = POWER_SUPPLY_STATUS_CHARGING;
else if (pmu_power_flags & PMU_PWR_AC_PRESENT)
val->intval = POWER_SUPPLY_STATUS_FULL;
else
val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
break;
case POWER_SUPPLY_PROP_PRESENT:
val->intval = !!(pbi->flags & PMU_BATT_PRESENT);
break;
case POWER_SUPPLY_PROP_MODEL_NAME:
val->strval = pmu_bat_get_model_name(pbi);
break;
case POWER_SUPPLY_PROP_ENERGY_AVG:
val->intval = pbi->charge * 1000; /* mWh -> µWh */
break;
case POWER_SUPPLY_PROP_ENERGY_FULL:
val->intval = pbi->max_charge * 1000; /* mWh -> µWh */
break;
case POWER_SUPPLY_PROP_CURRENT_AVG:
val->intval = pbi->amperage * 1000; /* mA -> µA */
break;
case POWER_SUPPLY_PROP_VOLTAGE_AVG:
val->intval = pbi->voltage * 1000; /* mV -> µV */
break;
case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
val->intval = pbi->time_remaining;
break;
default:
return -EINVAL;
}
return 0;
}
static enum power_supply_property pmu_bat_props[] = {
POWER_SUPPLY_PROP_STATUS,
POWER_SUPPLY_PROP_PRESENT,
POWER_SUPPLY_PROP_MODEL_NAME,
POWER_SUPPLY_PROP_ENERGY_AVG,
POWER_SUPPLY_PROP_ENERGY_FULL,
POWER_SUPPLY_PROP_CURRENT_AVG,
POWER_SUPPLY_PROP_VOLTAGE_AVG,
POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
};
/*********************************************************************
* Initialisation
*********************************************************************/
static struct platform_device *bat_pdev;
static int __init pmu_bat_init(void)
{
int ret;
int i;
bat_pdev = platform_device_register_simple("pmu-battery",
0, NULL, 0);
if (IS_ERR(bat_pdev)) {
ret = PTR_ERR(bat_pdev);
goto pdev_register_failed;
}
ret = power_supply_register(&bat_pdev->dev, &pmu_ac);
if (ret)
goto ac_register_failed;
for (i = 0; i < pmu_battery_count; i++) {
struct pmu_battery_dev *pbat = kzalloc(sizeof(*pbat),
GFP_KERNEL);
if (!pbat)
break;
sprintf(pbat->name, "PMU_battery_%d", i);
pbat->bat.name = pbat->name;
pbat->bat.properties = pmu_bat_props;
pbat->bat.num_properties = ARRAY_SIZE(pmu_bat_props);
pbat->bat.get_property = pmu_bat_get_property;
pbat->pbi = &pmu_batteries[i];
ret = power_supply_register(&bat_pdev->dev, &pbat->bat);
if (ret) {
kfree(pbat);
goto battery_register_failed;
}
pbats[i] = pbat;
}
goto success;
battery_register_failed:
while (i--) {
if (!pbats[i])
continue;
power_supply_unregister(&pbats[i]->bat);
kfree(pbats[i]);
}
power_supply_unregister(&pmu_ac);
ac_register_failed:
platform_device_unregister(bat_pdev);
pdev_register_failed:
success:
return ret;
}
static void __exit pmu_bat_exit(void)
{
int i;
for (i = 0; i < PMU_MAX_BATTERIES; i++) {
if (!pbats[i])
continue;
power_supply_unregister(&pbats[i]->bat);
kfree(pbats[i]);
}
power_supply_unregister(&pmu_ac);
platform_device_unregister(bat_pdev);
}
module_init(pmu_bat_init);
module_exit(pmu_bat_exit);
MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("PMU battery driver");