/*
* Battery and Power Management code for the Sharp SL-6000x
*
* Copyright (c) 2005 Dirk Opfer
* Copyright (c) 2008 Dmitry Baryshkov
*
* 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/wm97xx.h>
#include <linux/delay.h>
#include <linux/spinlock.h>
#include <linux/interrupt.h>
#include <linux/gpio.h>
#include <asm/mach-types.h>
#include <asm/arch/tosa.h>
static DEFINE_MUTEX(bat_lock); /* protects gpio pins */
static struct work_struct bat_work;
struct tosa_bat {
int status;
struct power_supply psy;
int full_chrg;
struct mutex work_lock; /* protects data */
bool (*is_present)(struct tosa_bat *bat);
int gpio_full;
int gpio_charge_off;
int technology;
int gpio_bat;
int adc_bat;
int adc_bat_divider;
int bat_max;
int bat_min;
int gpio_temp;
int adc_temp;
int adc_temp_divider;
};
static struct tosa_bat tosa_bat_main;
static struct tosa_bat tosa_bat_jacket;
static unsigned long tosa_read_bat(struct tosa_bat *bat)
{
unsigned long value = 0;
if (bat->gpio_bat < 0 || bat->adc_bat < 0)
return 0;
mutex_lock(&bat_lock);
gpio_set_value(bat->gpio_bat, 1);
msleep(5);
value = wm97xx_read_aux_adc(bat->psy.dev->parent->driver_data,
bat->adc_bat);
gpio_set_value(bat->gpio_bat, 0);
mutex_unlock(&bat_lock);
value = value * 1000000 / bat->adc_bat_divider;
return value;
}
static unsigned long tosa_read_temp(struct tosa_bat *bat)
{
unsigned long value = 0;
if (bat->gpio_temp < 0 || bat->adc_temp < 0)
return 0;
mutex_lock(&bat_lock);
gpio_set_value(bat->gpio_temp, 1);
msleep(5);
value = wm97xx_read_aux_adc(bat->psy.dev->parent->driver_data,
bat->adc_temp);
gpio_set_value(bat->gpio_temp, 0);
mutex_unlock(&bat_lock);
value = value * 10000 / bat->adc_temp_divider;
return value;
}
static int tosa_bat_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
int ret = 0;
struct tosa_bat *bat = container_of(psy, struct tosa_bat, psy);
if (bat->is_present && !bat->is_present(bat)
&& psp != POWER_SUPPLY_PROP_PRESENT) {
return -ENODEV;
}
switch (psp) {
case POWER_SUPPLY_PROP_STATUS:
val->intval = bat->status;
break;
case POWER_SUPPLY_PROP_TECHNOLOGY:
val->intval = bat->technology;
break;
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
val->intval = tosa_read_bat(bat);
break;
case POWER_SUPPLY_PROP_VOLTAGE_MAX:
if (bat->full_chrg == -1)
val->intval = bat->bat_max;
else
val->intval = bat->full_chrg;
break;
case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
val->intval = bat->bat_max;
break;
case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
val->intval = bat->bat_min;
break;
case POWER_SUPPLY_PROP_TEMP:
val->intval = tosa_read_temp(bat);
break;
case POWER_SUPPLY_PROP_PRESENT:
val->intval = bat->is_present ? bat->is_present(bat) : 1;
break;
default:
ret = -EINVAL;
break;
}
return ret;
}
static bool tosa_jacket_bat_is_present(struct tosa_bat *bat)
{
return gpio_get_value(TOSA_GPIO_JACKET_DETECT) == 0;
}
static void tosa_bat_external_power_changed(struct power_supply *psy)
{
schedule_work(&bat_work);
}
static irqreturn_t tosa_bat_gpio_isr(int irq, void *data)
{
pr_info("tosa_bat_gpio irq: %d\n", gpio_get_value(irq_to_gpio(irq)));
schedule_work(&bat_work);
return IRQ_HANDLED;
}
static void tosa_bat_update(struct tosa_bat *bat)
{
int old;
struct power_supply *psy = &bat->psy;
mutex_lock(&bat->work_lock);
old = bat->status;
if (bat->is_present && !bat->is_present(bat)) {
printk(KERN_NOTICE "%s not present\n", psy->name);
bat->status = POWER_SUPPLY_STATUS_UNKNOWN;
bat->full_chrg = -1;
} else if (power_supply_am_i_supplied(psy)) {
if (bat->status == POWER_SUPPLY_STATUS_DISCHARGING) {
gpio_set_value(bat->gpio_charge_off, 0);
mdelay(15);
}
if (gpio_get_value(bat->gpio_full)) {
if (old == POWER_SUPPLY_STATUS_CHARGING ||
bat->full_chrg == -1)
bat->full_chrg = tosa_read_bat(bat);
gpio_set_value(bat->gpio_charge_off, 1);
bat->status = POWER_SUPPLY_STATUS_FULL;
} else {
gpio_set_value(bat->gpio_charge_off, 0);
bat->status = POWER_SUPPLY_STATUS_CHARGING;
}
} else {
gpio_set_value(bat->gpio_charge_off, 1);
bat->status = POWER_SUPPLY_STATUS_DISCHARGING;
}
if (old != bat->status)
power_supply_changed(psy);
mutex_unlock(&bat->work_lock);
}
static void tosa_bat_work(struct work_struct *work)
{
tosa_bat_update(&tosa_bat_main);
tosa_bat_update(&tosa_bat_jacket);
}
static enum power_supply_property tosa_bat_main_props[] = {
POWER_SUPPLY_PROP_STATUS,
POWER_SUPPLY_PROP_TECHNOLOGY,
POWER_SUPPLY_PROP_VOLTAGE_NOW,
POWER_SUPPLY_PROP_VOLTAGE_MAX,
POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
POWER_SUPPLY_PROP_TEMP,
POWER_SUPPLY_PROP_PRESENT,
};
static enum power_supply_property tosa_bat_bu_props[] = {
POWER_SUPPLY_PROP_STATUS,
POWER_SUPPLY_PROP_TECHNOLOGY,
POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
POWER_SUPPLY_PROP_VOLTAGE_NOW,
POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
POWER_SUPPLY_PROP_PRESENT,
};
static struct tosa_bat tosa_bat_main = {
.status = POWER_SUPPLY_STATUS_DISCHARGING,
.full_chrg = -1,
.psy = {
.name = "main-battery",
.type = POWER_SUPPLY_TYPE_BATTERY,
.properties = tosa_bat_main_props,
.num_properties = ARRAY_SIZE(tosa_bat_main_props),
.get_property = tosa_bat_get_property,
.external_power_changed = tosa_bat_external_power_changed,
.use_for_apm = 1,
},
.gpio_full = TOSA_GPIO_BAT0_CRG,
.gpio_charge_off = TOSA_GPIO_CHARGE_OFF,
.technology = POWER_SUPPLY_TECHNOLOGY_LIPO,
.gpio_bat = TOSA_GPIO_BAT0_V_ON,
.adc_bat = WM97XX_AUX_ID3,
.adc_bat_divider = 414,
.bat_max = 4310000,
.bat_min = 1551 * 1000000 / 414,
.gpio_temp = TOSA_GPIO_BAT1_TH_ON,
.adc_temp = WM97XX_AUX_ID2,
.adc_temp_divider = 10000,
};
static struct tosa_bat tosa_bat_jacket = {
.status = POWER_SUPPLY_STATUS_DISCHARGING,
.full_chrg = -1,
.psy = {
.name = "jacket-battery",
.type = POWER_SUPPLY_TYPE_BATTERY,
.properties = tosa_bat_main_props,
.num_properties = ARRAY_SIZE(tosa_bat_main_props),
.get_property = tosa_bat_get_property,
.external_power_changed = tosa_bat_external_power_changed,
},
.is_present = tosa_jacket_bat_is_present,
.gpio_full = TOSA_GPIO_BAT1_CRG,
.gpio_charge_off = TOSA_GPIO_CHARGE_OFF_JC,
.technology = POWER_SUPPLY_TECHNOLOGY_LIPO,
.gpio_bat = TOSA_GPIO_BAT1_V_ON,
.adc_bat = WM97XX_AUX_ID3,
.adc_bat_divider = 414,
.bat_max = 4310000,
.bat_min = 1551 * 1000000 / 414,
.gpio_temp = TOSA_GPIO_BAT0_TH_ON,
.adc_temp = WM97XX_AUX_ID2,
.adc_temp_divider = 10000,
};
static struct tosa_bat tosa_bat_bu = {
.status = POWER_SUPPLY_STATUS_UNKNOWN,
.full_chrg = -1,
.psy = {
.name = "backup-battery",
.type = POWER_SUPPLY_TYPE_BATTERY,
.properties = tosa_bat_bu_props,
.num_properties = ARRAY_SIZE(tosa_bat_bu_props),
.get_property = tosa_bat_get_property,
.external_power_changed = tosa_bat_external_power_changed,
},
.gpio_full = -1,
.gpio_charge_off = -1,
.technology = POWER_SUPPLY_TECHNOLOGY_LiMn,
.gpio_bat = TOSA_GPIO_BU_CHRG_ON,
.adc_bat = WM97XX_AUX_ID4,
.adc_bat_divider = 1266,
.gpio_temp = -1,
.adc_temp = -1,
.adc_temp_divider = -1,
};
static struct {
int gpio;
char *name;
bool output;
int value;
} gpios[] = {
{ TOSA_GPIO_CHARGE_OFF, "main charge off", 1, 1 },
{ TOSA_GPIO_CHARGE_OFF_JC, "jacket charge off", 1, 1 },
{ TOSA_GPIO_BAT_SW_ON, "battery switch", 1, 0 },
{ TOSA_GPIO_BAT0_V_ON, "main battery", 1, 0 },
{ TOSA_GPIO_BAT1_V_ON, "jacket battery", 1, 0 },
{ TOSA_GPIO_BAT1_TH_ON, "main battery temp", 1, 0 },
{ TOSA_GPIO_BAT0_TH_ON, "jacket battery temp", 1, 0 },
{ TOSA_GPIO_BU_CHRG_ON, "backup battery", 1, 0 },
{ TOSA_GPIO_BAT0_CRG, "main battery full", 0, 0 },
{ TOSA_GPIO_BAT1_CRG, "jacket battery full", 0, 0 },
{ TOSA_GPIO_BAT0_LOW, "main battery low", 0, 0 },
{ TOSA_GPIO_BAT1_LOW, "jacket battery low", 0, 0 },
{ TOSA_GPIO_JACKET_DETECT, "jacket detect", 0, 0 },
};
#ifdef CONFIG_PM
static int tosa_bat_suspend(struct platform_device *dev, pm_message_t state)
{
/* flush all pending status updates */
flush_scheduled_work();
return 0;
}
static int tosa_bat_resume(struct platform_device *dev)
{
/* things may have changed while we were away */
schedule_work(&bat_work);
return 0;
}
#else
#define tosa_bat_suspend NULL
#define tosa_bat_resume NULL
#endif
static int __devinit tosa_bat_probe(struct platform_device *dev)
{
int ret;
int i;
if (!machine_is_tosa())
return -ENODEV;
for (i = 0; i < ARRAY_SIZE(gpios); i++) {
ret = gpio_request(gpios[i].gpio, gpios[i].name);
if (ret) {
i--;
goto err_gpio;
}
if (gpios[i].output)
ret = gpio_direction_output(gpios[i].gpio,
gpios[i].value);
else
ret = gpio_direction_input(gpios[i].gpio);
if (ret)
goto err_gpio;
}
mutex_init(&tosa_bat_main.work_lock);
mutex_init(&tosa_bat_jacket.work_lock);
INIT_WORK(&bat_work, tosa_bat_work);
ret = power_supply_register(&dev->dev, &tosa_bat_main.psy);
if (ret)
goto err_psy_reg_main;
ret = power_supply_register(&dev->dev, &tosa_bat_jacket.psy);
if (ret)
goto err_psy_reg_jacket;
ret = power_supply_register(&dev->dev, &tosa_bat_bu.psy);
if (ret)
goto err_psy_reg_bu;
ret = request_irq(gpio_to_irq(TOSA_GPIO_BAT0_CRG),
tosa_bat_gpio_isr,
IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
"main full", &tosa_bat_main);
if (ret)
goto err_req_main;
ret = request_irq(gpio_to_irq(TOSA_GPIO_BAT1_CRG),
tosa_bat_gpio_isr,
IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
"jacket full", &tosa_bat_jacket);
if (ret)
goto err_req_jacket;
ret = request_irq(gpio_to_irq(TOSA_GPIO_JACKET_DETECT),
tosa_bat_gpio_isr,
IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
"jacket detect", &tosa_bat_jacket);
if (!ret) {
schedule_work(&bat_work);
return 0;
}
free_irq(gpio_to_irq(TOSA_GPIO_BAT1_CRG), &tosa_bat_jacket);
err_req_jacket:
free_irq(gpio_to_irq(TOSA_GPIO_BAT0_CRG), &tosa_bat_main);
err_req_main:
power_supply_unregister(&tosa_bat_bu.psy);
err_psy_reg_bu:
power_supply_unregister(&tosa_bat_jacket.psy);
err_psy_reg_jacket:
power_supply_unregister(&tosa_bat_main.psy);
err_psy_reg_main:
/* see comment in tosa_bat_remove */
flush_scheduled_work();
i--;
err_gpio:
for (; i >= 0; i--)
gpio_free(gpios[i].gpio);
return ret;
}
static int __devexit tosa_bat_remove(struct platform_device *dev)
{
int i;
free_irq(gpio_to_irq(TOSA_GPIO_JACKET_DETECT), &tosa_bat_jacket);
free_irq(gpio_to_irq(TOSA_GPIO_BAT1_CRG), &tosa_bat_jacket);
free_irq(gpio_to_irq(TOSA_GPIO_BAT0_CRG), &tosa_bat_main);
power_supply_unregister(&tosa_bat_bu.psy);
power_supply_unregister(&tosa_bat_jacket.psy);
power_supply_unregister(&tosa_bat_main.psy);
/*
* now flush all pending work.
* we won't get any more schedules, since all
* sources (isr and external_power_changed)
* are unregistered now.
*/
flush_scheduled_work();
for (i = ARRAY_SIZE(gpios) - 1; i >= 0; i--)
gpio_free(gpios[i].gpio);
return 0;
}
static struct platform_driver tosa_bat_driver = {
.driver.name = "wm97xx-battery",
.driver.owner = THIS_MODULE,
.probe = tosa_bat_probe,
.remove = __devexit_p(tosa_bat_remove),
.suspend = tosa_bat_suspend,
.resume = tosa_bat_resume,
};
static int __init tosa_bat_init(void)
{
return platform_driver_register(&tosa_bat_driver);
}
static void __exit tosa_bat_exit(void)
{
platform_driver_unregister(&tosa_bat_driver);
}
module_init(tosa_bat_init);
module_exit(tosa_bat_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Dmitry Baryshkov");
MODULE_DESCRIPTION("Tosa battery driver");
MODULE_ALIAS("platform:wm97xx-battery");
