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openwrt-xburst/target/linux/xburst/files-2.6.31/drivers/power/jz4740-battery.c

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2009-08-20 12:38:17 +03:00
/*
* Battery measurement code for Ingenic JZ SOC.
*
* based on tosa_battery.c
*
* Copyright (C) 2008 Marek Vasut <marek.vasut@gmail.com>
* Copyright (C) 2009 Jiejing Zhang <kzjeef@gmail.com>
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*
* 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/power/jz4740-battery.h>
#include <linux/jz4740-adc.h>
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struct jz_battery_info {
struct power_supply usb;
struct power_supply bat;
struct power_supply ac;
int bat_status;
struct jz_batt_info *pdata;
struct mutex work_lock;
struct workqueue_struct *monitor_wqueue;
struct delayed_work bat_work;
};
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#define ps_to_jz_battery(x) container_of((x), struct jz_battery_info, bat);
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/*********************************************************************
* Power
*********************************************************************/
static int jz_get_power_prop(struct jz_battery_info *bat_info,
struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
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{
int gpio;
if (bat_info == 0 || bat_info->pdata == 0)
return -EINVAL;
gpio = (psy->type == POWER_SUPPLY_TYPE_MAINS) ?
bat_info->pdata->dc_dect_gpio :
bat_info->pdata->usb_dect_gpio;
if (!gpio_is_valid(gpio))
return -EINVAL;
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switch (psp) {
case POWER_SUPPLY_PROP_ONLINE:
val->intval = !gpio_get_value(gpio);
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break;
default:
return -EINVAL;
}
return 0;
}
static int jz_usb_get_power_prop(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
struct jz_battery_info *bat_info = container_of(psy, struct jz_battery_info, usb);
return jz_get_power_prop(bat_info, psy, psp, val);
}
static int jz_ac_get_power_prop(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
struct jz_battery_info *bat_info = container_of(psy, struct jz_battery_info, ac);
return jz_get_power_prop(bat_info, psy, psp, val);
}
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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_ac_get_power_prop,
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};
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_usb_get_power_prop,
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};
/*********************************************************************
* Battery properties
*********************************************************************/
static long jz_read_bat(struct power_supply *psy)
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{
struct jz_battery_info *bat_info = ps_to_jz_battery(psy);
enum jz_adc_battery_scale scale;
if (bat_info->pdata->max_voltag > 2500000)
scale = JZ_ADC_BATTERY_SCALE_7V5;
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else
scale = JZ_ADC_BATTERY_SCALE_2V5;
return jz4740_adc_read_battery_voltage(psy->dev->parent->parent, scale);
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}
static int jz_bat_get_capacity(struct power_supply *psy)
{
int ret;
struct jz_battery_info *bat_info = ps_to_jz_battery(psy);
ret = jz_read_bat(psy);
if (ret < 0)
return ret;
ret = (ret - bat_info->pdata->min_voltag) * 100
/ (bat_info->pdata->max_voltag - bat_info->pdata->min_voltag);
if (ret > 100)
ret = 100;
else if (ret < 0)
ret = 0;
return ret;
}
static int jz_bat_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
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{
struct jz_battery_info *bat_info = ps_to_jz_battery(psy)
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switch (psp) {
case POWER_SUPPLY_PROP_STATUS:
val->intval = bat_info->bat_status;
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break;
case POWER_SUPPLY_PROP_TECHNOLOGY:
val->intval = bat_info->pdata->batt_tech;
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break;
case POWER_SUPPLY_PROP_HEALTH:
if(jz_read_bat(psy) < bat_info->pdata->min_voltag) {
dev_dbg(psy->dev, "%s: battery is dead,"
"voltage too low!\n", __func__);
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val->intval = POWER_SUPPLY_HEALTH_DEAD;
} else {
dev_dbg(psy->dev, "%s: battery is good,"
"voltage normal.\n", __func__);
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val->intval = POWER_SUPPLY_HEALTH_GOOD;
}
break;
case POWER_SUPPLY_PROP_CAPACITY:
val->intval = jz_bat_get_capacity(psy);
dev_dbg(psy->dev, "%s: battery_capacity = %d\n",
__func__, val->intval);
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break;
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
val->intval = jz_read_bat(psy);
if (val->intval < 0)
return val->intval;
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break;
case POWER_SUPPLY_PROP_VOLTAGE_MAX:
case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
val->intval = bat_info->pdata->max_voltag;
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break;
case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
val->intval = bat_info->pdata->min_voltag;
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break;
case POWER_SUPPLY_PROP_PRESENT:
val->intval = 1;
break;
default:
return -EINVAL;
}
return 0;
}
static void jz_bat_external_power_changed(struct power_supply *psy)
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{
struct jz_battery_info *bat_info = ps_to_jz_battery(psy);
cancel_delayed_work(&bat_info->bat_work);
queue_delayed_work(bat_info->monitor_wqueue, &bat_info->bat_work, HZ / 8);
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}
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 *psy)
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{
struct jz_battery_info *bat_info = ps_to_jz_battery(psy);
int old_status = bat_info->bat_status;
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static unsigned long old_batt_vol = 0;
unsigned long batt_vol = jz_read_bat(psy);
mutex_lock(&bat_info->work_lock);
if (gpio_is_valid(bat_info->pdata->charg_stat_gpio)) {
if(!gpio_get_value(bat_info->pdata->charg_stat_gpio))
bat_info->bat_status = POWER_SUPPLY_STATUS_CHARGING;
else
bat_info->bat_status = POWER_SUPPLY_STATUS_NOT_CHARGING;
dev_dbg(psy->dev, "%s: battery status=%s\n",
__func__, status_text[bat_info->bat_status]);
if (old_status != bat_info->bat_status) {
dev_dbg(psy->dev, "%s %s -> %s\n",
psy->name,
status_text[old_status],
status_text[bat_info->bat_status]);
power_supply_changed(psy);
}
}
if (old_batt_vol - batt_vol > 50000) {
dev_dbg(psy->dev, "voltage change : %ld -> %ld\n",
old_batt_vol, batt_vol);
power_supply_changed(psy);
old_batt_vol = batt_vol;
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}
mutex_unlock(&bat_info->work_lock);
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}
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,
};
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)
{
/* query interval too small will increase system workload*/
const int interval = HZ * 30;
struct jz_battery_info *bat_info = container_of(work,struct jz_battery_info, bat_work.work);
jz_bat_update(&bat_info->bat);
queue_delayed_work(bat_info->monitor_wqueue,
&bat_info->bat_work, interval);
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}
#ifdef CONFIG_PM
static int jz_bat_suspend(struct platform_device *pdev, pm_message_t state)
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{
struct jz_battery_info *bat_info = platform_get_drvdata(pdev);
bat_info->bat_status = POWER_SUPPLY_STATUS_UNKNOWN;
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return 0;
}
static int jz_bat_resume(struct platform_device *pdev)
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{
struct jz_battery_info *bat_info = platform_get_drvdata(pdev);
bat_info->bat_status = POWER_SUPPLY_STATUS_UNKNOWN;
cancel_delayed_work(&bat_info->bat_work);
queue_delayed_work(bat_info->monitor_wqueue, &bat_info->bat_work, HZ/10);
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return 0;
}
#else
#define jz_bat_suspend NULL
#define jz_bat_resume NULL
#endif
static int jz_bat_probe(struct platform_device *pdev)
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{
int ret = 0;
struct jz_battery_info *bat_info;
bat_info = kzalloc(sizeof(struct jz_battery_info), GFP_KERNEL);
if (!bat_info) {
return -ENOMEM;
}
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if (!pdev->dev.platform_data) {
dev_err(&pdev->dev, "Please set battery info\n");
ret = -EINVAL;
goto err_platform_data;
}
platform_set_drvdata(pdev, bat_info);
bat_info->pdata = pdev->dev.platform_data;
bat_info->bat = bat_ps;
bat_info->usb = jz_usb;
bat_info->ac = jz_ac;
mutex_init(&bat_info->work_lock);
INIT_DELAYED_WORK(&bat_info->bat_work, jz_bat_work);
if (gpio_is_valid(bat_info->pdata->dc_dect_gpio)) {
ret = gpio_request(bat_info->pdata->dc_dect_gpio, "AC/DC DECT");
if (ret) {
dev_err(&pdev->dev, "ac/dc dect gpio request failed.\n");
goto err_dc_gpio_request;
}
ret = gpio_direction_input(bat_info->pdata->dc_dect_gpio);
if (ret) {
dev_err(&pdev->dev, "ac/dc dect gpio direction failed.\n");
goto err_dc_gpio_direction;
}
}
if (gpio_is_valid(bat_info->pdata->usb_dect_gpio)) {
ret = gpio_request(bat_info->pdata->usb_dect_gpio, "USB DECT");
if (ret) {
dev_err(&pdev->dev, "usb dect gpio request failed.\n");
goto err_usb_gpio_request;
}
ret = gpio_direction_input(bat_info->pdata->usb_dect_gpio);
if (ret) {
dev_err(&pdev->dev, "usb dect gpio set direction failed.\n");
goto err_usb_gpio_direction;
}
jz_gpio_disable_pullup(bat_info->pdata->usb_dect_gpio);
/* TODO: Use generic gpio is better */
}
if (gpio_is_valid(bat_info->pdata->charg_stat_gpio)) {
ret = gpio_request(bat_info->pdata->charg_stat_gpio, "CHARG STAT");
if (ret) {
dev_err(&pdev->dev, "charger state gpio request failed.\n");
goto err_charg_gpio_request;
}
ret = gpio_direction_input(bat_info->pdata->charg_stat_gpio);
if (ret) {
dev_err(&pdev->dev, "charger state gpio set direction failed.\n");
goto err_charg_gpio_direction;
}
}
if (gpio_is_valid(bat_info->pdata->dc_dect_gpio)) {
ret = power_supply_register(&pdev->dev, &bat_info->ac);
if (ret) {
dev_err(&pdev->dev, "power supply ac/dc register failed.\n");
goto err_power_register_ac;
}
}
if (gpio_is_valid(bat_info->pdata->usb_dect_gpio)) {
ret = power_supply_register(&pdev->dev, &bat_info->usb);
if (ret) {
dev_err(&pdev->dev, "power supply usb register failed.\n");
goto err_power_register_usb;
}
}
if (gpio_is_valid(bat_info->pdata->charg_stat_gpio)) {
ret = power_supply_register(&pdev->dev, &bat_info->bat);
if (ret) {
dev_err(&pdev->dev, "power supply battery register failed.\n");
goto err_power_register_bat;
} else {
bat_info->monitor_wqueue = create_singlethread_workqueue("jz_battery");
if (!bat_info->monitor_wqueue) {
return -ESRCH;
}
queue_delayed_work(bat_info->monitor_wqueue, &bat_info->bat_work, HZ * 1);
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}
}
printk(KERN_INFO "jz_bat init success.\n");
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return ret;
err_power_register_bat:
power_supply_unregister(&bat_info->usb);
err_power_register_usb:
power_supply_unregister(&bat_info->ac);
err_power_register_ac:
err_charg_gpio_direction:
gpio_free(bat_info->pdata->charg_stat_gpio);
err_charg_gpio_request:
err_usb_gpio_direction:
gpio_free(bat_info->pdata->usb_dect_gpio);
err_usb_gpio_request:
err_dc_gpio_direction:
gpio_free(bat_info->pdata->dc_dect_gpio);
err_dc_gpio_request:
err_platform_data:
kfree(bat_info);
return ret;
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}
static int jz_bat_remove(struct platform_device *pdev)
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{
struct jz_battery_info *bat_info = platform_get_drvdata(pdev);
if (bat_info->pdata) {
if (gpio_is_valid(bat_info->pdata->dc_dect_gpio))
gpio_free(bat_info->pdata->dc_dect_gpio);
if (gpio_is_valid(bat_info->pdata->usb_dect_gpio))
gpio_free(bat_info->pdata->usb_dect_gpio);
if (gpio_is_valid(bat_info->pdata->charg_stat_gpio))
gpio_free(bat_info->pdata->charg_stat_gpio);
}
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power_supply_unregister(&bat_ps);
power_supply_unregister(&jz_ac);
power_supply_unregister(&jz_usb);
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return 0;
}
static struct platform_driver jz_bat_driver = {
.probe = jz_bat_probe,
.remove = __devexit_p(jz_bat_remove),
.suspend = jz_bat_suspend,
.resume = jz_bat_resume,
.driver = {
.name = "jz4740-battery",
.owner = THIS_MODULE,
},
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};
static int __init jz_bat_init(void)
{
return platform_driver_register(&jz_bat_driver);
}
module_init(jz_bat_init);
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static void __exit jz_bat_exit(void)
{
platform_driver_unregister(&jz_bat_driver);
}
module_exit(jz_bat_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Jiejing Zhang <kzjeef@gmail.com>");
MODULE_DESCRIPTION("JZ4720/JZ4740 SoC battery driver");