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/*
* Dumb driver for gta01 battery
*
* Copyright 2009 Openmoko, Inc
* Balaji Rao <balajirrao@openmoko.org>
*/
#include <linux/module.h>
#include <linux/param.h>
#include <linux/delay.h>
#include <linux/workqueue.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/gta01_battery.h>
struct gta01_battery {
struct power_supply psy;
struct gta01_bat_platform_data *pdata;
};
static enum power_supply_property gta01_bat_props[] = {
POWER_SUPPLY_PROP_PRESENT,
POWER_SUPPLY_PROP_STATUS,
POWER_SUPPLY_PROP_VOLTAGE_NOW,
POWER_SUPPLY_PROP_CURRENT_NOW,
POWER_SUPPLY_PROP_CAPACITY,
POWER_SUPPLY_PROP_CHARGE_FULL,
POWER_SUPPLY_PROP_CHARGE_NOW,
};
/* Capacity of typical BL-5C dumb battery */
#define GTA01_BAT_CHARGE_FULL 850000
static int gta01_bat_voltscale(int volt)
{
/* This table is suggested by SpeedEvil based on analysis of
* experimental data */
static const int lut[][2] = {
{ 4120, 100 },
{ 3900, 60 },
{ 3740, 25 },
{ 3600, 5 },
{ 3000, 0 } };
int i, res = 0;
if (volt > lut[0][0])
res = lut[0][1];
else
for (i = 0; lut[i][1]; i++) {
if (volt <= lut[i][0] && volt >= lut[i+1][0]) {
res = lut[i][1] - (lut[i][0]-volt)*
(lut[i][1]-lut[i+1][1])/
(lut[i][0]-lut[i+1][0]);
break;
}
}
return res;
}
static int gta01_bat_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
struct gta01_battery *bat = container_of(psy, struct gta01_battery, psy);
switch(psp) {
case POWER_SUPPLY_PROP_STATUS:
if (bat->pdata->get_charging_status)
if (bat->pdata->get_charging_status())
val->intval = POWER_SUPPLY_STATUS_CHARGING;
else
val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
else
val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
break;
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
if (bat->pdata->get_voltage)
val->intval = bat->pdata->get_voltage();
else
val->intval = 0;
break;
case POWER_SUPPLY_PROP_CURRENT_NOW:
if (bat->pdata->get_current)
val->intval = bat->pdata->get_current();
else
val->intval = 0;
break;
case POWER_SUPPLY_PROP_PRESENT:
val->intval = 1; /* You must never run GTA01 without battery. */
break;
case POWER_SUPPLY_PROP_CHARGE_NOW:
if (bat->pdata->get_voltage) {
int perc = gta01_bat_voltscale(
bat->pdata->get_voltage()/1000);
val->intval = perc * GTA01_BAT_CHARGE_FULL / 100;
} else
val->intval = 0;
break;
case POWER_SUPPLY_PROP_CAPACITY:
if (bat->pdata->get_voltage)
val->intval = gta01_bat_voltscale(
bat->pdata->get_voltage()/1000);
else
val->intval = 0;
break;
case POWER_SUPPLY_PROP_CHARGE_FULL:
val->intval = GTA01_BAT_CHARGE_FULL;
break;
default:
return -EINVAL;
}
return 0;
}
static void gta01_bat_ext_changed(struct power_supply *psy)
{
struct gta01_battery *bat = container_of(psy, struct gta01_battery, psy);
power_supply_changed(&bat->psy);
}
static int gta01_battery_probe(struct platform_device *pdev)
{
struct gta01_battery *gta01_bat;
gta01_bat = kzalloc(sizeof(*gta01_bat), GFP_KERNEL);
if (!gta01_bat)
return -ENOMEM;
gta01_bat->psy.name = "battery";
gta01_bat->psy.type = POWER_SUPPLY_TYPE_BATTERY;
gta01_bat->psy.properties = gta01_bat_props;
gta01_bat->psy.num_properties = ARRAY_SIZE(gta01_bat_props);
gta01_bat->psy.get_property = gta01_bat_get_property;
gta01_bat->psy.external_power_changed = gta01_bat_ext_changed;
gta01_bat->pdata = pdev->dev.platform_data;
platform_set_drvdata(pdev, gta01_bat);
power_supply_register(&pdev->dev, >a01_bat->psy);
return 0;
}
static int gta01_battery_remove(struct platform_device *pdev)
{
struct gta01_battery *bat = platform_get_drvdata(pdev);
power_supply_unregister(&bat->psy);
kfree(bat);
return 0;
}
static struct platform_driver gta01_battery_driver = {
.driver = {
.name = "gta01_battery",
},
.probe = gta01_battery_probe,
.remove = gta01_battery_remove,
};
static int __init gta01_battery_init(void)
{
return platform_driver_register(>a01_battery_driver);
}
static void __exit gta01_battery_exit(void)
{
platform_driver_unregister(>a01_battery_driver);
}
module_init(gta01_battery_init);
module_exit(gta01_battery_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>");
MODULE_DESCRIPTION("gta01 battery driver");
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