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openwrt-xburst/target/linux/xburst/files-2.6.27/drivers/power/jz_battery.c
Mirko Vogt dc3d3f1c49 yet another patchset - 2.6.27
it's basically also provided by ingenic and nativly based on 2.6.27,
adjusted to fit into the OpenWrt-environment
2009-10-28 03:13:11 +08:00

299 lines
7.3 KiB
C
Executable File

/*
* linux/drivers/power/jz_battery
*
* Battery measurement code for Ingenic JZ SOC.
*
* 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 <asm/jzsoc.h>
#ifdef CONFIG_POWER_SUPPLY_DEBUG
#define dprintk(x...) printk(x)
#else
#define dprintk(x...) while(0){}
#endif
#define JZ_BAT_MAX_VOLTAGE 4200000 // uV
#define JZ_BAT_MIN_VOLTAGE 3600000
static DEFINE_MUTEX(bat_lock);
struct workqueue_struct *monitor_wqueue;
struct delayed_work bat_work;
struct mutex work_lock;
int bat_status = POWER_SUPPLY_STATUS_DISCHARGING;
extern unsigned int jz_read_battery(void);
/*********************************************************************
* Power
*********************************************************************/
static int jz_get_power_prop(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
switch (psp) {
case POWER_SUPPLY_PROP_ONLINE:
if (psy->type == POWER_SUPPLY_TYPE_MAINS)
val->intval = !__gpio_get_pin(GPIO_DC_DETE_N);
else
val->intval = __gpio_get_pin(GPIO_USB_DETE);
break;
default:
return -EINVAL;
}
return 0;
}
static enum power_supply_property jz_power_props[] = {
POWER_SUPPLY_PROP_ONLINE,
};
static struct power_supply jz_ac = {
.name = "ac",
.type = POWER_SUPPLY_TYPE_MAINS,
.properties = jz_power_props,
.num_properties = ARRAY_SIZE(jz_power_props),
.get_property = jz_get_power_prop,
};
static struct power_supply jz_usb = {
.name = "usb",
.type = POWER_SUPPLY_TYPE_USB,
.properties = jz_power_props,
.num_properties = ARRAY_SIZE(jz_power_props),
.get_property = jz_get_power_prop,
};
/*********************************************************************
* Battery properties
*********************************************************************/
static unsigned long jz_read_bat(struct power_supply *bat_ps)
{
unsigned long val;
if (CFG_PBAT_DIV == 1)
val = (((unsigned long long)jz_read_battery() * 7500000)) >> 12;
else
val = (((unsigned long long)jz_read_battery() * CFG_PBAT_DIV * 2500000)) >> 12;
dprintk("--raw_batter_vol=%d uV\n", val);
return val;
}
static int jz_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 = POWER_SUPPLY_TECHNOLOGY_LIPO;
break;
case POWER_SUPPLY_PROP_HEALTH:
if(jz_read_bat(bat_ps) < 3600000) {
dprintk("--battery dead\n");
val->intval = POWER_SUPPLY_HEALTH_DEAD;
} else {
dprintk("--battery good\n");
val->intval = POWER_SUPPLY_HEALTH_GOOD;
}
break;
case POWER_SUPPLY_PROP_CAPACITY:
val->intval = (jz_read_bat(bat_ps) - 3600000) * 100 / (4200000 - 3600000);
if (val->intval > 100)
val->intval = 100;
dprintk("--battery_capacity=%d\%\n",val->intval);
break;
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
val->intval = jz_read_bat(bat_ps);
break;
case POWER_SUPPLY_PROP_VOLTAGE_MAX:
case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
val->intval = JZ_BAT_MAX_VOLTAGE;
break;
case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
val->intval = JZ_BAT_MIN_VOLTAGE;
break;
case POWER_SUPPLY_PROP_PRESENT:
val->intval = 1;
break;
case POWER_SUPPLY_PROP_TEMP:
case POWER_SUPPLY_PROP_VOL:
val->intval = 0; // reading TEMP and VOL aren't supported
break;
default:
return -EINVAL;
}
return 0;
}
static void jz_bat_external_power_changed(struct power_supply *bat_ps)
{
cancel_delayed_work(&bat_work);
queue_delayed_work(monitor_wqueue, &bat_work, HZ/10);
}
static char *status_text[] = {
[POWER_SUPPLY_STATUS_UNKNOWN] = "Unknown",
[POWER_SUPPLY_STATUS_CHARGING] = "Charging",
[POWER_SUPPLY_STATUS_DISCHARGING] = "Discharging",
[POWER_SUPPLY_STATUS_NOT_CHARGING] = "Not charging",
};
static void jz_bat_update(struct power_supply *bat_ps)
{
int old_status = bat_status;
static unsigned long old_batt_vol = 0;
unsigned long batt_vol = jz_read_bat(bat_ps);
mutex_lock(&work_lock);
if(!__gpio_get_pin(GPIO_CHARG_STAT_N))
bat_status = POWER_SUPPLY_STATUS_CHARGING;
else {
bat_status = POWER_SUPPLY_STATUS_NOT_CHARGING;
}
dprintk("--battery status=%s\n", status_text[bat_status]);
if ((old_status != bat_status) ||
(old_batt_vol - batt_vol > 50000)) {
pr_debug("%s %s -> %s\n", bat_ps->name,
status_text[old_status],
status_text[bat_status]);
power_supply_changed(bat_ps);
}
old_batt_vol = batt_vol;
mutex_unlock(&work_lock);
}
static enum power_supply_property jz_bat_main_props[] = {
POWER_SUPPLY_PROP_STATUS,
POWER_SUPPLY_PROP_TECHNOLOGY,
POWER_SUPPLY_PROP_HEALTH,
POWER_SUPPLY_PROP_CAPACITY, /* in percents! */
POWER_SUPPLY_PROP_VOLTAGE_NOW,
POWER_SUPPLY_PROP_VOLTAGE_MAX,
POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
POWER_SUPPLY_PROP_PRESENT,
POWER_SUPPLY_PROP_TEMP,
POWER_SUPPLY_PROP_VOL,
};
struct power_supply bat_ps = {
.name = "battery",
.type = POWER_SUPPLY_TYPE_BATTERY,
.properties = jz_bat_main_props,
.num_properties = ARRAY_SIZE(jz_bat_main_props),
.get_property = jz_bat_get_property,
.external_power_changed = jz_bat_external_power_changed,
.use_for_apm = 1,
};
static void jz_bat_work(struct work_struct *work)
{
const int interval = HZ * 6;
jz_bat_update(&bat_ps);
queue_delayed_work(monitor_wqueue, &bat_work, interval);
}
#ifdef CONFIG_PM
static int jz_bat_suspend(struct platform_device *dev, pm_message_t state)
{
bat_status = POWER_SUPPLY_STATUS_UNKNOWN;
return 0;
}
static int jz_bat_resume(struct platform_device *dev)
{
bat_status = POWER_SUPPLY_STATUS_UNKNOWN;
cancel_delayed_work(&bat_work);
queue_delayed_work(monitor_wqueue, &bat_work, HZ/10);
return 0;
}
#else
#define jz_bat_suspend NULL
#define jz_bat_resume NULL
#endif
static int __devinit jz_bat_probe(struct platform_device *dev)
{
int ret = 0;
printk("JZ battery init.\n");
mutex_init(&work_lock);
INIT_DELAYED_WORK(&bat_work, jz_bat_work);
__gpio_disable_pull(GPIO_USB_DETE);
power_supply_register(&dev->dev, &jz_ac);
power_supply_register(&dev->dev, &jz_usb);
ret = power_supply_register(&dev->dev, &bat_ps);
if (!ret) {
monitor_wqueue = create_singlethread_workqueue("jz_battery");
if (!monitor_wqueue) {
return -ESRCH;
}
queue_delayed_work(monitor_wqueue, &bat_work, HZ * 1);
}
return ret;
}
static int __devexit jz_bat_remove(struct platform_device *dev)
{
power_supply_unregister(&bat_ps);
return 0;
}
static struct platform_driver jz_bat_driver = {
.driver.name = "jz-battery",
.driver.owner = THIS_MODULE,
.probe = jz_bat_probe,
.remove = __devexit_p(jz_bat_remove),
.suspend = jz_bat_suspend,
.resume = jz_bat_resume,
};
static int __init jz_bat_init(void)
{
platform_device_register_simple("jz-battery", 0, NULL, 0);
return platform_driver_register(&jz_bat_driver);
}
static void __exit jz_bat_exit(void)
{
platform_driver_unregister(&jz_bat_driver);
}
module_init(jz_bat_init);
module_exit(jz_bat_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
MODULE_DESCRIPTION("Palm T|X battery driver");