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/*
* 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/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/io.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/gpio.h>
#include <linux/mfd/core.h>
#include <linux/power_supply.h>
#include <linux/power/jz4740-battery.h>
#include <linux/jz4740-adc.h>
struct jz_battery {
struct jz_battery_platform_data *pdata;
struct platform_device *pdev;
void __iomem *base;
int irq;
int charge_irq;
const struct mfd_cell *cell;
int status;
long voltage;
struct completion read_completion;
struct power_supply battery;
struct delayed_work work;
struct mutex lock;
};
static inline struct jz_battery *psy_to_jz_battery(struct power_supply *psy)
{
return container_of(psy, struct jz_battery, battery);
}
static irqreturn_t jz_battery_irq_handler(int irq, void *devid)
{
struct jz_battery *battery = devid;
complete(&battery->read_completion);
return IRQ_HANDLED;
}
static long jz_battery_read_voltage(struct jz_battery *battery)
{
long t;
unsigned long val;
long voltage;
mutex_lock(&battery->lock);
reinit_completion(&battery->read_completion);
enable_irq(battery->irq);
battery->cell->enable(battery->pdev);
t = wait_for_completion_interruptible_timeout(&battery->read_completion,
HZ);
if (t > 0) {
val = readw(battery->base) & 0xfff;
if (battery->pdata->info.voltage_max_design <= 2500000)
val = (val * 78125UL) >> 7UL;
else
val = ((val * 924375UL) >> 9UL) + 33000;
voltage = (long)val;
} else {
voltage = t ? t : -ETIMEDOUT;
}
battery->cell->disable(battery->pdev);
disable_irq(battery->irq);
mutex_unlock(&battery->lock);
return voltage;
}
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);
mod_delayed_work(system_wq, &jz_battery->work, 0);
}
static irqreturn_t jz_battery_charge_irq(int irq, void *data)
{
struct jz_battery *jz_battery = data;
mod_delayed_work(system_wq, &jz_battery->work, 0);
return IRQ_HANDLED;
}
static void jz_battery_update(struct jz_battery *jz_battery)
{
int status;
long voltage;
bool has_changed = false;
int is_charging;
if (gpio_is_valid(jz_battery->pdata->gpio_charge)) {
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 = true;
}
}
voltage = jz_battery_read_voltage(jz_battery);
if (abs(voltage - jz_battery->voltage) < 50000) {
jz_battery->voltage = voltage;
has_changed = true;
}
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.parent->platform_data;
struct jz_battery *jz_battery;
struct power_supply *battery;
struct resource *mem;
if (!pdata) {
dev_err(&pdev->dev, "No platform_data supplied\n");
return -ENXIO;
}
jz_battery = devm_kzalloc(&pdev->dev, sizeof(*jz_battery), GFP_KERNEL);
if (!jz_battery) {
dev_err(&pdev->dev, "Failed to allocate driver structure\n");
return -ENOMEM;
}
jz_battery->cell = mfd_get_cell(pdev);
jz_battery->irq = platform_get_irq(pdev, 0);
if (jz_battery->irq < 0) {
dev_err(&pdev->dev, "Failed to get platform irq: %d\n", ret);
return jz_battery->irq;
}
mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
jz_battery->base = devm_ioremap_resource(&pdev->dev, mem);
if (IS_ERR(jz_battery->base))
return PTR_ERR(jz_battery
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