linux-sg2042/drivers/power/collie_battery.c

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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\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->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 = 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 collie_bat_suspend(struct ucb1x00_dev *dev, pm_message_t state)
{
/* flush all pending status updates */
workqueue: deprecate flush[_delayed]_work_sync() flush[_delayed]_work_sync() are now spurious. Mark them deprecated and convert all users to flush[_delayed]_work(). If you're cc'd and wondering what's going on: Now all workqueues are non-reentrant and the regular flushes guarantee that the work item is not pending or running on any CPU on return, so there's no reason to use the sync flushes at all and they're going away. This patch doesn't make any functional difference. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Russell King <linux@arm.linux.org.uk> Cc: Paul Mundt <lethal@linux-sh.org> Cc: Ian Campbell <ian.campbell@citrix.com> Cc: Jens Axboe <axboe@kernel.dk> Cc: Mattia Dongili <malattia@linux.it> Cc: Kent Yoder <key@linux.vnet.ibm.com> Cc: David Airlie <airlied@linux.ie> Cc: Jiri Kosina <jkosina@suse.cz> Cc: Karsten Keil <isdn@linux-pingi.de> Cc: Bryan Wu <bryan.wu@canonical.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Alasdair Kergon <agk@redhat.com> Cc: Mauro Carvalho Chehab <mchehab@infradead.org> Cc: Florian Tobias Schandinat <FlorianSchandinat@gmx.de> Cc: David Woodhouse <dwmw2@infradead.org> Cc: "David S. Miller" <davem@davemloft.net> Cc: linux-wireless@vger.kernel.org Cc: Anton Vorontsov <cbou@mail.ru> Cc: Sangbeom Kim <sbkim73@samsung.com> Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Eric Van Hensbergen <ericvh@gmail.com> Cc: Takashi Iwai <tiwai@suse.de> Cc: Steven Whitehouse <swhiteho@redhat.com> Cc: Petr Vandrovec <petr@vandrovec.name> Cc: Mark Fasheh <mfasheh@suse.com> Cc: Christoph Hellwig <hch@infradead.org> Cc: Avi Kivity <avi@redhat.com>
2012-08-21 05:51:24 +08:00
flush_work(&bat_work);
return 0;
}
static int collie_bat_resume(struct ucb1x00_dev *dev)
{
/* 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;
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);
ret = power_supply_register(&dev->ucb->dev, &collie_bat_main.psy);
if (ret)
goto err_psy_reg_main;
ret = power_supply_register(&dev->ucb->dev, &collie_bat_bu.psy);
if (ret)
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) {
schedule_work(&bat_work);
return 0;
}
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");