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/*
* Battery and Power Management code for the Sharp SL-5x00
*
* Copyright (C) 2009 Thomas Kunze
*
* based on tosa_battery.c
*
* 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/gpio.h>
#include <linux/mfd/ucb1x00.h>
#include <asm/mach/sharpsl_param.h>
#include <asm/mach-types.h>
#include <mach/collie.h>
static DEFINE_MUTEX(bat_lock); /* protects gpio pins */
static struct work_struct bat_work;
static struct ucb1x00 *ucb;
struct collie_bat {
int status;
struct power_supply psy;
int full_chrg;
struct mutex work_lock; /* protects data */
bool (*is_present)(struct collie_bat *bat);
int gpio_full;
int gpio_charge_on;
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 collie_bat collie_bat_main;
static unsigned long collie_read_bat(struct collie_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);
ucb1x00_adc_enable(ucb);
value = ucb1x00_adc_read(ucb, bat->adc_bat, UCB_SYNC);
ucb1x00_adc_disable(ucb);
gpio_set_value(bat->gpio_bat, 0);
mutex_unlock(&bat_lock);
value = value * 1000000 / bat->adc_bat_divider;
return value;
}
static unsigned long collie_read_temp(struct collie_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);
ucb1x00_adc_enable(ucb);
value = ucb1x00_adc_read(ucb, bat->adc_temp, UCB_SYNC);
ucb1x00_adc_disable(ucb);
gpio_set_value(bat->gpio_temp, 0);
mutex_unlock(&bat_lock);
value = value * 10000 / bat->adc_temp_divider;
return value;
}
static int collie_bat_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
int ret = 0;
struct collie_bat *bat = container_of(psy, struct collie_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 = collie_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 = collie_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 void collie_bat_external_power_changed(struct power_supply *psy)
{
schedule_work(&bat_work);
}
static irqreturn_t collie_bat_gpio_isr(int irq, void *data)
{
pr_info("collie_bat_gpio irq: %d\n", gpio_get_value(irq_to_gpio(irq)));
schedule_work(&bat_work);
return IRQ_HANDLED;
}
static void collie_bat_update(struct collie_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_on, 1);
mdelay(15);
}
if (gpio_get_value(bat->gpio_full)) {
if (old == POWER_SUPPLY_STATUS_CHARGING ||
bat->full_chrg == -1)
bat->full_chrg = collie_read_bat(bat);
gpio_set_value(bat->gpio_charge_on, 0);
bat->status = POWER_SUPPLY_STATUS_FULL;
} else {
gpio_set_value(bat->gpio_charge_on, 1);
bat->status = POWER_SUPPLY_STATUS_CHARGING;
}
} else {
gpio_set_value(bat->gpio_charge_on, 0);
bat->status = POWER_SUPPLY_STATUS_DISCHARGING;
}
if (old != bat->status)
power_supply_changed(psy);
mutex_unlock(&bat->work_lock);
}
static void collie_bat_work(struct work_struct *work)
{
collie_bat_update(&collie_bat_main);
}
static enum power_supply_property collie_bat_main_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_VOLTAGE_MAX,
POWER_SUPPLY_PROP_PRESENT,
POWER_SUPPLY_PROP_TEMP,
};
static enum power_supply_property collie_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_VOLTAGE_MAX,
POWER_SUPPLY_PROP_PRESENT,
};
static struct collie_bat collie_bat_main = {
.status = POWER_SUPPLY_STATUS_DISCHARGING,
.full_chrg = -1,
.psy = {
.name = "main-battery",
.type = POWER_SUPPLY_TYPE_BATTERY,
.properties = collie_bat_main_props,
.num_properties = ARRAY_SIZE(collie_bat_main_props),
.get_property = collie_bat_get_property,
.external_power_changed = collie_bat_external_power_changed,
.use_for_apm = 1,
},
.gpio_full = COLLIE_GPIO_CO,
.gpio_charge_on = COLLIE_GPIO_CHARGE_ON,
.technology = POWER_SUPPLY_TECHNOLOGY_LIPO,
.gpio_bat = COLLIE_GPIO_MBAT_ON,
.adc_bat = UCB_ADC_INP_AD1,
.adc_bat_divider = 155,
.bat_max = 4310000,
.bat_min = 1551 * 1000000 / 414,
.gpio_temp = COLLIE_GPIO_TMP_ON,
.adc_temp = UCB_ADC_INP_AD0,
.adc_temp_divider = 10000,
};
static struct collie_bat collie_bat_bu = {
.status = POWER_SUPPLY_STATUS_UNKNOWN,
.full_chrg = -1,
.psy = {
.name = "backup-battery",
.type = POWER_SUPPLY_TYPE_BATTERY,
.properties = collie_bat_bu_props,
.num_properties = ARRAY_SIZE(collie_bat_bu_props),
.get_property = collie_bat_get_property,
.external_power_changed = collie_bat_external_power_changed,
},
.gpio_full = -1,
.gpio_charge_on = -1,
.technology = POWER_SUPPLY_TECHNOLOGY_LiMn,
.gpio_bat = COLLIE_GPIO_BBAT_ON,
.adc_bat = UCB_ADC_INP_AD1,
.adc_bat_divider = 155,
.bat_max =
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