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linux/drivers/power/collie_battery.c
Arnd Bergmann 6a65b2b2af power: collie_battery: hide unused variable 
The 'wakeup_enabled' variable in this driver is only accessed
by the optional power management functions and we get a warning
when they are disabled:

drivers/power/collie_battery.c:29:12: error: 'wakeup_enabled' defined but not used [-Werror=unused-variable]

This moves the definition next to the users inside the same #ifdef,
which avoids the warning.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Sebastian Reichel <sre@kernel.org>
2016-02-15 06:01:51 +01:00

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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 = power_supply_get_drvdata(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\n");
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->desc->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 const struct power_supply_desc collie_bat_main_desc = {
.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,
};
static struct collie_bat collie_bat_main = {
.status = POWER_SUPPLY_STATUS_DISCHARGING,
.full_chrg = -1,
.psy = NULL,
.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 const struct power_supply_desc collie_bat_bu_desc = {
.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,
};
static struct collie_bat collie_bat_bu = {
.status = POWER_SUPPLY_STATUS_UNKNOWN,
.full_chrg = -1,
.psy = NULL,
.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 = 3000000,
.bat_min = 1900000,
.gpio_temp = -1,
.adc_temp = -1,
.adc_temp_divider = -1,
};
static struct gpio collie_batt_gpios[] = {
{ COLLIE_GPIO_CO, GPIOF_IN, "main battery full" },
{ COLLIE_GPIO_MAIN_BAT_LOW, GPIOF_IN, "main battery low" },
{ COLLIE_GPIO_CHARGE_ON, GPIOF_OUT_INIT_LOW, "main charge on" },
{ COLLIE_GPIO_MBAT_ON, GPIOF_OUT_INIT_LOW, "main battery" },
{ COLLIE_GPIO_TMP_ON, GPIOF_OUT_INIT_LOW, "main battery temp" },
{ COLLIE_GPIO_BBAT_ON, GPIOF_OUT_INIT_LOW, "backup battery" },
};
#ifdef CONFIG_PM
static int wakeup_enabled;
static int collie_bat_suspend(struct ucb1x00_dev *dev)
{
/* flush all pending status updates */
flush_work(&bat_work);
if (device_may_wakeup(&dev->ucb->dev) &&
collie_bat_main.status == POWER_SUPPLY_STATUS_CHARGING)
wakeup_enabled = !enable_irq_wake(gpio_to_irq(COLLIE_GPIO_CO));
else
wakeup_enabled = 0;
return 0;
}
static int collie_bat_resume(struct ucb1x00_dev *dev)
{
if (wakeup_enabled)
disable_irq_wake(gpio_to_irq(COLLIE_GPIO_CO));
/* things may have changed while we were away */
schedule_work(&bat_work);
return 0;
}
#else
#define collie_bat_suspend NULL
#define collie_bat_resume NULL
#endif
static int collie_bat_probe(struct ucb1x00_dev *dev)
{
int ret;
struct power_supply_config psy_main_cfg = {}, psy_bu_cfg = {};
if (!machine_is_collie())
return -ENODEV;
ucb = dev->ucb;
ret = gpio_request_array(collie_batt_gpios,
ARRAY_SIZE(collie_batt_gpios));
if (ret)
return ret;
mutex_init(&collie_bat_main.work_lock);
INIT_WORK(&bat_work, collie_bat_work);
psy_main_cfg.drv_data = &collie_bat_main;
collie_bat_main.psy = power_supply_register(&dev->ucb->dev,
&collie_bat_main_desc,
&psy_main_cfg);
if (IS_ERR(collie_bat_main.psy)) {
ret = PTR_ERR(collie_bat_main.psy);
goto err_psy_reg_main;
}
psy_bu_cfg.drv_data = &collie_bat_bu;
collie_bat_bu.psy = power_supply_register(&dev->ucb->dev,
&collie_bat_bu_desc,
&psy_bu_cfg);
if (IS_ERR(collie_bat_bu.psy)) {
ret = PTR_ERR(collie_bat_bu.psy);
goto err_psy_reg_bu;
}
ret = request_irq(gpio_to_irq(COLLIE_GPIO_CO),
collie_bat_gpio_isr,
IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
"main full", &collie_bat_main);
if (ret)
goto err_irq;
device_init_wakeup(&ucb->dev, 1);
schedule_work(&bat_work);
return 0;
err_irq:
power_supply_unregister(collie_bat_bu.psy);
err_psy_reg_bu:
power_supply_unregister(collie_bat_main.psy);
err_psy_reg_main:
/* see comment in collie_bat_remove */
cancel_work_sync(&bat_work);
gpio_free_array(collie_batt_gpios, ARRAY_SIZE(collie_batt_gpios));
return ret;
}
static void collie_bat_remove(struct ucb1x00_dev *dev)
{
free_irq(gpio_to_irq(COLLIE_GPIO_CO), &collie_bat_main);
power_supply_unregister(collie_bat_bu.psy);
power_supply_unregister(collie_bat_main.psy);
/*
* Now cancel the bat_work. We won't get any more schedules,
* since all sources (isr and external_power_changed) are
* unregistered now.
*/
cancel_work_sync(&bat_work);
gpio_free_array(collie_batt_gpios, ARRAY_SIZE(collie_batt_gpios));
}
static struct ucb1x00_driver collie_bat_driver = {
.add = collie_bat_probe,
.remove = collie_bat_remove,
.suspend = collie_bat_suspend,
.resume = collie_bat_resume,
};
static int __init collie_bat_init(void)
{
return ucb1x00_register_driver(&collie_bat_driver);
}
static void __exit collie_bat_exit(void)
{
ucb1x00_unregister_driver(&collie_bat_driver);
}
module_init(collie_bat_init);
module_exit(collie_bat_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Thomas Kunze");
MODULE_DESCRIPTION("Collie battery driver");
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