351 lines
8.7 KiB
C
351 lines
8.7 KiB
C
/*
|
|
* Battery measurement code for Ingenic JZ SOC.
|
|
*
|
|
* Copyright (C) 2009 Jiejing Zhang <kzjeef@gmail.com>
|
|
* Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
|
|
*
|
|
* 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/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/power_supply.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/gpio.h>
|
|
#include <linux/interrupt.h>
|
|
|
|
#include <linux/power/jz4740-battery.h>
|
|
#include <linux/jz4740-adc.h>
|
|
|
|
struct jz_battery {
|
|
struct jz_battery_platform_data *pdata;
|
|
|
|
int charge_irq;
|
|
|
|
int status;
|
|
long voltage;
|
|
|
|
struct power_supply battery;
|
|
struct delayed_work work;
|
|
};
|
|
|
|
static inline struct jz_battery *psy_to_jz_battery(struct power_supply *psy)
|
|
{
|
|
return container_of(psy, struct jz_battery, battery);
|
|
}
|
|
|
|
static long jz_battery_read_voltage(struct jz_battery *jz_battery)
|
|
{
|
|
struct device *adc = jz_battery->battery.dev->parent->parent;
|
|
enum jz_adc_battery_scale scale;
|
|
|
|
if (jz_battery->pdata->info.voltage_max_design > 2500000)
|
|
scale = JZ_ADC_BATTERY_SCALE_7V5;
|
|
else
|
|
scale = JZ_ADC_BATTERY_SCALE_2V5;
|
|
|
|
return jz4740_adc_read_battery_voltage(adc, scale);
|
|
}
|
|
|
|
static int jz_battery_get_capacity(struct power_supply *psy)
|
|
{
|
|
struct jz_battery *jz_battery = psy_to_jz_battery(psy);
|
|
struct power_supply_info *info = &jz_battery->pdata->info;
|
|
long voltage;
|
|
int ret;
|
|
int voltage_span;
|
|
|
|
voltage = jz_battery_read_voltage(jz_battery);
|
|
|
|
if (voltage < 0)
|
|
return voltage;
|
|
|
|
voltage_span = info->voltage_max_design - info->voltage_min_design;
|
|
ret = ((voltage - info->voltage_min_design) * 100) / voltage_span;
|
|
|
|
if (ret > 100)
|
|
ret = 100;
|
|
else if (ret < 0)
|
|
ret = 0;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int jz_battery_get_property(struct power_supply *psy,
|
|
enum power_supply_property psp,
|
|
union power_supply_propval *val)
|
|
{
|
|
struct jz_battery *jz_battery = psy_to_jz_battery(psy);
|
|
struct power_supply_info *info = &jz_battery->pdata->info;
|
|
long voltage;
|
|
|
|
switch (psp) {
|
|
case POWER_SUPPLY_PROP_STATUS:
|
|
val->intval = jz_battery->status;
|
|
break;
|
|
case POWER_SUPPLY_PROP_TECHNOLOGY:
|
|
val->intval = jz_battery->pdata->info.technology;
|
|
break;
|
|
case POWER_SUPPLY_PROP_HEALTH:
|
|
voltage = jz_battery_read_voltage(jz_battery);
|
|
if (voltage < info->voltage_min_design)
|
|
val->intval = POWER_SUPPLY_HEALTH_DEAD;
|
|
else
|
|
val->intval = POWER_SUPPLY_HEALTH_GOOD;
|
|
break;
|
|
case POWER_SUPPLY_PROP_CAPACITY:
|
|
val->intval = jz_battery_get_capacity(psy);
|
|
break;
|
|
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
|
|
val->intval = jz_battery_read_voltage(jz_battery);
|
|
if (val->intval < 0)
|
|
return val->intval;
|
|
break;
|
|
case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
|
|
val->intval = info->voltage_max_design;
|
|
break;
|
|
case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
|
|
val->intval = info->voltage_min_design;
|
|
break;
|
|
case POWER_SUPPLY_PROP_PRESENT:
|
|
val->intval = 1;
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void jz_battery_external_power_changed(struct power_supply *psy)
|
|
{
|
|
struct jz_battery *jz_battery = psy_to_jz_battery(psy);
|
|
|
|
cancel_delayed_work(&jz_battery->work);
|
|
schedule_delayed_work(&jz_battery->work, 0);
|
|
}
|
|
|
|
static irqreturn_t jz_battery_charge_irq(int irq, void *data)
|
|
{
|
|
struct jz_battery *jz_battery = data;
|
|
|
|
cancel_delayed_work(&jz_battery->work);
|
|
schedule_delayed_work(&jz_battery->work, 0);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static void jz_battery_update(struct jz_battery *jz_battery)
|
|
{
|
|
int status;
|
|
long voltage;
|
|
long voltage_difference;
|
|
bool has_changed = 0;
|
|
|
|
if (gpio_is_valid(jz_battery->pdata->gpio_charge)) {
|
|
int is_charging;
|
|
|
|
is_charging = gpio_get_value(jz_battery->pdata->gpio_charge);
|
|
is_charging ^= jz_battery->pdata->gpio_charge_active_low;
|
|
if (is_charging)
|
|
status = POWER_SUPPLY_STATUS_CHARGING;
|
|
else
|
|
status = POWER_SUPPLY_STATUS_NOT_CHARGING;
|
|
|
|
if (status != jz_battery->status) {
|
|
jz_battery->status = status;
|
|
has_changed = 1;
|
|
}
|
|
}
|
|
|
|
voltage = jz_battery_read_voltage(jz_battery);
|
|
voltage_difference = voltage - jz_battery->voltage;
|
|
if (voltage_difference > 50000 || voltage_difference < 50000) {
|
|
jz_battery->voltage = voltage;
|
|
has_changed = 1;
|
|
}
|
|
if (has_changed)
|
|
power_supply_changed(&jz_battery->battery);
|
|
}
|
|
|
|
static enum power_supply_property jz_battery_properties[] = {
|
|
POWER_SUPPLY_PROP_STATUS,
|
|
POWER_SUPPLY_PROP_TECHNOLOGY,
|
|
POWER_SUPPLY_PROP_HEALTH,
|
|
POWER_SUPPLY_PROP_CAPACITY,
|
|
POWER_SUPPLY_PROP_VOLTAGE_NOW,
|
|
POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
|
|
POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
|
|
POWER_SUPPLY_PROP_PRESENT,
|
|
};
|
|
|
|
static void jz_battery_work(struct work_struct *work)
|
|
{
|
|
/* Too small interval will increase system workload */
|
|
const int interval = HZ * 30;
|
|
struct jz_battery *jz_battery = container_of(work, struct jz_battery,
|
|
work.work);
|
|
|
|
jz_battery_update(jz_battery);
|
|
schedule_delayed_work(&jz_battery->work, interval);
|
|
}
|
|
|
|
static int jz_battery_probe(struct platform_device *pdev)
|
|
{
|
|
int ret = 0;
|
|
struct jz_battery_platform_data *pdata = pdev->dev.platform_data;
|
|
struct jz_battery *jz_battery;
|
|
struct power_supply *battery;
|
|
|
|
if (!pdev->dev.platform_data) {
|
|
dev_err(&pdev->dev, "No platform data\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
jz_battery = kzalloc(sizeof(*jz_battery), GFP_KERNEL);
|
|
|
|
if (!jz_battery) {
|
|
dev_err(&pdev->dev, "Failed to allocate driver structure\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
battery = &jz_battery->battery;
|
|
battery->name = pdata->info.name;
|
|
battery->type = POWER_SUPPLY_TYPE_BATTERY;
|
|
battery->properties = jz_battery_properties;
|
|
battery->num_properties = ARRAY_SIZE(jz_battery_properties);
|
|
battery->get_property = jz_battery_get_property;
|
|
battery->external_power_changed = jz_battery_external_power_changed;
|
|
battery->use_for_apm = 1;
|
|
|
|
jz_battery->pdata = pdata;
|
|
|
|
INIT_DELAYED_WORK(&jz_battery->work, jz_battery_work);
|
|
|
|
if (gpio_is_valid(pdata->gpio_charge)) {
|
|
ret = gpio_request(pdata->gpio_charge, dev_name(&pdev->dev));
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "charger state gpio request failed.\n");
|
|
goto err_free;
|
|
}
|
|
ret = gpio_direction_input(pdata->gpio_charge);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "charger state gpio set direction failed.\n");
|
|
goto err_free_gpio;
|
|
}
|
|
|
|
jz_battery->charge_irq = gpio_to_irq(pdata->gpio_charge);
|
|
|
|
if (jz_battery->charge_irq >= 0) {
|
|
ret = request_irq(jz_battery->charge_irq,
|
|
jz_battery_charge_irq,
|
|
IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
|
|
dev_name(&pdev->dev), jz_battery);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "Failed to request charge irq: %d\n", ret);
|
|
goto err_free_gpio;
|
|
}
|
|
}
|
|
} else {
|
|
jz_battery->charge_irq = -1;
|
|
}
|
|
|
|
|
|
ret = power_supply_register(&pdev->dev, &jz_battery->battery);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "power supply battery register failed.\n");
|
|
goto err_free_irq;
|
|
}
|
|
|
|
platform_set_drvdata(pdev, jz_battery);
|
|
schedule_delayed_work(&jz_battery->work, 0);
|
|
|
|
return 0;
|
|
|
|
err_free_irq:
|
|
if (jz_battery->charge_irq >= 0)
|
|
free_irq(jz_battery->charge_irq, jz_battery);
|
|
err_free_gpio:
|
|
if (gpio_is_valid(pdata->gpio_charge))
|
|
gpio_free(jz_battery->pdata->gpio_charge);
|
|
err_free:
|
|
kfree(jz_battery);
|
|
return ret;
|
|
}
|
|
|
|
static int jz_battery_remove(struct platform_device *pdev)
|
|
{
|
|
struct jz_battery *jz_battery = platform_get_drvdata(pdev);
|
|
|
|
cancel_delayed_work_sync(&jz_battery->work);
|
|
|
|
if (gpio_is_valid(jz_battery->pdata->gpio_charge)) {
|
|
if (jz_battery->charge_irq >= 0)
|
|
free_irq(jz_battery->charge_irq, jz_battery);
|
|
gpio_free(jz_battery->pdata->gpio_charge);
|
|
}
|
|
|
|
power_supply_unregister(&jz_battery->battery);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM
|
|
static int jz_battery_suspend(struct platform_device *pdev, pm_message_t state)
|
|
{
|
|
struct jz_battery *jz_battery = platform_get_drvdata(pdev);
|
|
|
|
cancel_delayed_work_sync(&jz_battery->work);
|
|
jz_battery->status = POWER_SUPPLY_STATUS_UNKNOWN;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int jz_battery_resume(struct platform_device *pdev)
|
|
{
|
|
struct jz_battery *jz_battery = platform_get_drvdata(pdev);
|
|
|
|
schedule_delayed_work(&jz_battery->work, 0);
|
|
|
|
return 0;
|
|
}
|
|
#else
|
|
#define jz_battery_suspend NULL
|
|
#define jz_battery_resume NULL
|
|
#endif
|
|
|
|
static struct platform_driver jz_battery_driver = {
|
|
.probe = jz_battery_probe,
|
|
.remove = __devexit_p(jz_battery_remove),
|
|
.suspend = jz_battery_suspend,
|
|
.resume = jz_battery_resume,
|
|
.driver = {
|
|
.name = "jz4740-battery",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
};
|
|
|
|
static int __init jz_battery_init(void)
|
|
{
|
|
return platform_driver_register(&jz_battery_driver);
|
|
}
|
|
module_init(jz_battery_init);
|
|
|
|
static void __exit jz_battery_exit(void)
|
|
{
|
|
platform_driver_unregister(&jz_battery_driver);
|
|
}
|
|
module_exit(jz_battery_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Jiejing Zhang <kzjeef@gmail.com>");
|
|
MODULE_DESCRIPTION("JZ4720/JZ4740 SoC battery driver");
|