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/*
* linux/drivers/power/wm97xx_battery.c
*
* Battery measurement code for WM97xx
*
* based on tosa_battery.c
*
* Copyright (C) 2008 Marek Vasut <marek.vasut@gmail.com>
*
* 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/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/wm97xx.h>
#include <linux/spinlock.h>
#include <linux/interrupt.h>
#include <linux/gpio.h>
#include <linux/wm97xx_batt.h>
static DEFINE_MUTEX(bat_lock);
static struct work_struct bat_work;
struct mutex work_lock;
static int bat_status = POWER_SUPPLY_STATUS_UNKNOWN;
static struct wm97xx_batt_info *pdata;
static enum power_supply_property *prop;
static unsigned long wm97xx_read_bat(struct power_supply *bat_ps)
{
return wm97xx_read_aux_adc(dev_get_drvdata(bat_ps->dev->parent),
pdata->batt_aux) * pdata->batt_mult /
pdata->batt_div;
}
static unsigned long wm97xx_read_temp(struct power_supply *bat_ps)
{
return wm97xx_read_aux_adc(dev_get_drvdata(bat_ps->dev->parent),
pdata->temp_aux) * pdata->temp_mult /
pdata->temp_div;
}
static int wm97xx_bat_get_property(struct power_supply *bat_ps,
enum power_supply_property psp,
union power_supply_propval *val)
{
switch (psp) {
case POWER_SUPPLY_PROP_STATUS:
val->intval = bat_status;
break;
case POWER_SUPPLY_PROP_TECHNOLOGY:
val->intval = pdata->batt_tech;
break;
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
if (pdata->batt_aux >= 0)
val->intval = wm97xx_read_bat(bat_ps);
else
return -EINVAL;
break;
case POWER_SUPPLY_PROP_TEMP:
if (pdata->temp_aux >= 0)
val->intval = wm97xx_read_temp(bat_ps);
else
return -EINVAL;
break;
case POWER_SUPPLY_PROP_VOLTAGE_MAX:
if (pdata->max_voltage >= 0)
val->intval = pdata->max_voltage;
else
return -EINVAL;
break;
case POWER_SUPPLY_PROP_VOLTAGE_MIN:
if (pdata->min_voltage >= 0)
val->intval = pdata->min_voltage;
else
return -EINVAL;
break;
case POWER_SUPPLY_PROP_PRESENT:
val->intval = 1;
break;
default:
return -EINVAL;
}
return 0;
}
static void wm97xx_bat_external_power_changed(struct power_supply *bat_ps)
{
schedule_work(&bat_work);
}
static void wm97xx_bat_update(struct power_supply *bat_ps)
{
int old_status = bat_status;
mutex_lock(&work_lock);
bat_status = (pdata->charge_gpio >= 0) ?
(gpio_get_value(pdata->charge_gpio) ?
POWER_SUPPLY_STATUS_DISCHARGING :
POWER_SUPPLY_STATUS_CHARGING) :
POWER_SUPPLY_STATUS_UNKNOWN;
if (old_status != bat_status) {
pr_debug("%s: %i -> %i\n", bat_ps->name, old_status,
bat_status);
power_supply_changed(bat_ps);
}
mutex_unlock(&work_lock);
}
static struct power_supply bat_ps = {
.type = POWER_SUPPLY_TYPE_BATTERY,
.get_property = wm97xx_bat_get_property,
.external_power_changed = wm97xx_bat_external_power_changed,
.use_for_apm = 1,
};
static void wm97xx_bat_work(struct work_struct *work)
{
wm97xx_bat_update(&bat_ps);
}
#ifdef CONFIG_PM
static int wm97xx_bat_suspend(struct platform_device *dev, pm_message_t state)
{
flush_scheduled_work();
return 0;
}
static int wm97xx_bat_resume(struct platform_device *dev)
{
schedule_work(&bat_work);
return 0;
}
#else
#define wm97xx_bat_suspend NULL
#define wm97xx_bat_resume NULL
#endif
static int __devinit wm97xx_bat_probe(struct platform_device *dev)
{
int ret = 0;
int props = 1; /* POWER_SUPPLY_PROP_PRESENT */
int i = 0;
if (dev->id != -1)
return -EINVAL;
mutex_init(&work_lock);
if (!pdata) {
dev_err(&dev->dev, "Please use wm97xx_bat_set_pdata\n");
return -EINVAL;
}
if (pdata->charge_gpio >= 0 && gpio_is_valid(pdata->charge_gpio)) {
ret = gpio_request(pdata->charge_gpio, "BATT CHRG");
if (ret)
goto err;
ret = gpio_direction_input(pdata->charge_gpio);
if (ret)
goto err2;
props++; /* POWER_SUPPLY_PROP_STATUS */
}
if (pdata->batt_tech >= 0)
props++; /* POWER_SUPPLY_PROP_TECHNOLOGY */
if (pdata->temp_aux >= 0)
props++; /* POWER_SUPPLY_PROP_TEMP */
if (pdata->batt_aux >= 0)
props++; /* POWER_SUPPLY_PROP_VOLTAGE_NOW */
if (pdata->max_voltage >= 0)
props++; /* POWER_SUPPLY_PROP_VOLTAGE_MAX */
if (pdata->min_voltage >= 0)
props++; /* POWER_SUPPLY_PROP_VOLTAGE_MIN */
prop = kzalloc(props * sizeof(*prop), GFP_KERNEL);
if (!prop)
goto err2;
prop[i++] = POWER_SUPPLY_PROP_PRESENT;
if (pdata->charge_gpio >= 0)
prop[i++] = POWER_SUPPLY_PROP_STATUS;
if (pdata->batt_tech >= 0)
prop[i++] = POWER_SUPPLY_PROP_TECHNOLOGY;
if (pdata->temp_aux >= 0)
prop[i++] = POWER_SUPPLY_PROP_TEMP;
if (pdata->batt_aux >= 0)
prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_NOW;
if (pdata->max_voltage >= 0)
prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_MAX;
if (pdata->min_voltage >= 0)
prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_MIN;
INIT_WORK(&bat_work, wm97xx_bat_work);
if (!pdata->batt_name) {
dev_info(&dev->dev, "Please consider setting proper battery "
"name in platform definition file, falling "
"back to name \"wm97xx-batt\"\n");
bat_ps.name = "wm97xx-batt";
} else
bat_ps.name = pdata->batt_name;
bat_ps.properties = prop;
bat_ps.num_properties = props;
ret = power_supply_register(&dev->dev, &bat_ps);
if (!ret)
schedule_work(&bat_work);
else
goto err3;
return 0;
err3:
kfree(prop);
err2:
gpio_free(pdata->charge_gpio);
err:
return ret;
}
static int __devexit wm97xx_bat_remove(struct platform_device *dev)
{
if (pdata && pdata->charge_gpio && pdata->charge_gpio >= 0)
gpio_free(pdata->charge_gpio);
flush_scheduled_work();
power_supply_unregister(&bat_ps);
kfree(prop);
return 0;
}
static struct platform_driver wm97xx_bat_driver = {
.driver = {
.name = "wm97xx-battery",
.owner = THIS_MODULE,
},
.probe = wm97xx_bat_probe,
.remove = __devexit_p(wm97xx_bat_remove),
.suspend = wm97xx_bat_suspend,
.resume = wm97xx_bat_resume,
};
static int __init wm97xx_bat_init(void)
{
return platform_driver_register(&wm97xx_bat_driver);
}
static void __exit wm97xx_bat_exit(void)
{
platform_driver_unregister(&wm97xx_bat_driver);
}
void __init wm97xx_bat_set_pdata(struct wm97xx_batt_info *data)
{
pdata = data;
}
EXPORT_SYMBOL_GPL(wm97xx_bat_set_pdata);
module_init(wm97xx_bat_init);
module_exit(wm97xx_bat_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
MODULE_DESCRIPTION("WM97xx battery driver");
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