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linux-sg2042/drivers/power/s3c_adc_battery.c

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/*
* iPAQ h1930/h1940/rx1950 battery controller driver
* Copyright (c) Vasily Khoruzhick
* Based on h1940_battery.c by Arnaud Patard
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file COPYING in the main directory of this archive for
* more details.
*
*/
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/leds.h>
#include <linux/gpio.h>
#include <linux/err.h>
#include <linux/timer.h>
#include <linux/jiffies.h>
#include <linux/s3c_adc_battery.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/module.h>
#include <plat/adc.h>
#define BAT_POLL_INTERVAL 10000 /* ms */
#define JITTER_DELAY 500 /* ms */
struct s3c_adc_bat {
struct power_supply psy;
struct s3c_adc_client *client;
struct s3c_adc_bat_pdata *pdata;
int volt_value;
int cur_value;
unsigned int timestamp;
int level;
int status;
int cable_plugged:1;
};
static struct delayed_work bat_work;
static void s3c_adc_bat_ext_power_changed(struct power_supply *psy)
{
schedule_delayed_work(&bat_work,
msecs_to_jiffies(JITTER_DELAY));
}
static int gather_samples(struct s3c_adc_client *client, int num, int channel)
{
int value, i;
/* default to 1 if nothing is set */
if (num < 1)
num = 1;
value = 0;
for (i = 0; i < num; i++)
value += s3c_adc_read(client, channel);
value /= num;
return value;
}
static enum power_supply_property s3c_adc_backup_bat_props[] = {
POWER_SUPPLY_PROP_VOLTAGE_NOW,
POWER_SUPPLY_PROP_VOLTAGE_MIN,
POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
};
static int s3c_adc_backup_bat_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
struct s3c_adc_bat *bat = container_of(psy, struct s3c_adc_bat, psy);
if (!bat) {
dev_err(psy->dev, "%s: no battery infos ?!\n", __func__);
return -EINVAL;
}
if (bat->volt_value < 0 ||
jiffies_to_msecs(jiffies - bat->timestamp) >
BAT_POLL_INTERVAL) {
bat->volt_value = gather_samples(bat->client,
bat->pdata->backup_volt_samples,
bat->pdata->backup_volt_channel);
bat->volt_value *= bat->pdata->backup_volt_mult;
bat->timestamp = jiffies;
}
switch (psp) {
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
val->intval = bat->volt_value;
return 0;
case POWER_SUPPLY_PROP_VOLTAGE_MIN:
val->intval = bat->pdata->backup_volt_min;
return 0;
case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
val->intval = bat->pdata->backup_volt_max;
return 0;
default:
return -EINVAL;
}
}
static struct s3c_adc_bat backup_bat = {
.psy = {
.name = "backup-battery",
.type = POWER_SUPPLY_TYPE_BATTERY,
.properties = s3c_adc_backup_bat_props,
.num_properties = ARRAY_SIZE(s3c_adc_backup_bat_props),
.get_property = s3c_adc_backup_bat_get_property,
.use_for_apm = 1,
},
};
static enum power_supply_property s3c_adc_main_bat_props[] = {
POWER_SUPPLY_PROP_STATUS,
POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN,
POWER_SUPPLY_PROP_CHARGE_NOW,
POWER_SUPPLY_PROP_VOLTAGE_NOW,
POWER_SUPPLY_PROP_CURRENT_NOW,
};
static int calc_full_volt(int volt_val, int cur_val, int impedance)
{
return volt_val + cur_val * impedance / 1000;
}
static int charge_finished(struct s3c_adc_bat *bat)
{
return bat->pdata->gpio_inverted ?
!gpio_get_value(bat->pdata->gpio_charge_finished) :
gpio_get_value(bat->pdata->gpio_charge_finished);
}
static int s3c_adc_bat_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
struct s3c_adc_bat *bat = container_of(psy, struct s3c_adc_bat, psy);
int new_level;
int full_volt;
const struct s3c_adc_bat_thresh *lut = bat->pdata->lut_noac;
unsigned int lut_size = bat->pdata->lut_noac_cnt;
if (!bat) {
dev_err(psy->dev, "no battery infos ?!\n");
return -EINVAL;
}
if (bat->volt_value < 0 || bat->cur_value < 0 ||
jiffies_to_msecs(jiffies - bat->timestamp) >
BAT_POLL_INTERVAL) {
bat->volt_value = gather_samples(bat->client,
bat->pdata->volt_samples,
bat->pdata->volt_channel) * bat->pdata->volt_mult;
bat->cur_value = gather_samples(bat->client,
bat->pdata->current_samples,
bat->pdata->current_channel) * bat->pdata->current_mult;
bat->timestamp = jiffies;
}
if (bat->cable_plugged &&
((bat->pdata->gpio_charge_finished < 0) ||
!charge_finished(bat))) {
lut = bat->pdata->lut_acin;
lut_size = bat->pdata->lut_acin_cnt;
}
new_level = 100000;
full_volt = calc_full_volt((bat->volt_value / 1000),
(bat->cur_value / 1000), bat->pdata->internal_impedance);
if (full_volt < calc_full_volt(lut->volt, lut->cur,
bat->pdata->internal_impedance)) {
lut_size--;
while (lut_size--) {
int lut_volt1;
int lut_volt2;
lut_volt1 = calc_full_volt(lut[0].volt, lut[0].cur,
bat->pdata->internal_impedance);
lut_volt2 = calc_full_volt(lut[1].volt, lut[1].cur,
bat->pdata->internal_impedance);
if (full_volt < lut_volt1 && full_volt >= lut_volt2) {
new_level = (lut[1].level +
(lut[0].level - lut[1].level) *
(full_volt - lut_volt2) /
(lut_volt1 - lut_volt2)) * 1000;
break;
}
new_level = lut[1].level * 1000;
lut++;
}
}
bat->level = new_level;
switch (psp) {
case POWER_SUPPLY_PROP_STATUS:
if (bat->pdata->gpio_charge_finished < 0)
val->intval = bat->level == 100000 ?
POWER_SUPPLY_STATUS_FULL : bat->status;
else
val->intval = bat->status;
return 0;
case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
val->intval = 100000;
return 0;
case POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN:
val->intval = 0;
return 0;
case POWER_SUPPLY_PROP_CHARGE_NOW:
val->intval = bat->level;
return 0;
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
val->intval = bat->volt_value;
return 0;
case POWER_SUPPLY_PROP_CURRENT_NOW:
val->intval = bat->cur_value;
return 0;
default:
return -EINVAL;
}
}
static struct s3c_adc_bat main_bat = {
.psy = {
.name = "main-battery",
.type = POWER_SUPPLY_TYPE_BATTERY,
.properties = s3c_adc_main_bat_props,
.num_properties = ARRAY_SIZE(s3c_adc_main_bat_props),
.get_property = s3c_adc_bat_get_property,
.external_power_changed = s3c_adc_bat_ext_power_changed,
.use_for_apm = 1,
},
};
static void s3c_adc_bat_work(struct work_struct *work)
{
struct s3c_adc_bat *bat = &main_bat;
int is_charged;
int is_plugged;
static int was_plugged;
is_plugged = power_supply_am_i_supplied(&bat->psy);
bat->cable_plugged = is_plugged;
if (is_plugged != was_plugged) {
was_plugged = is_plugged;
if (is_plugged) {
if (bat->pdata->enable_charger)
bat->pdata->enable_charger();
bat->status = POWER_SUPPLY_STATUS_CHARGING;
} else {
if (bat->pdata->disable_charger)
bat->pdata->disable_charger();
bat->status = POWER_SUPPLY_STATUS_DISCHARGING;
}
} else {
if ((bat->pdata->gpio_charge_finished >= 0) && is_plugged) {
is_charged = charge_finished(&main_bat);
if (is_charged) {
if (bat->pdata->disable_charger)
bat->pdata->disable_charger();
bat->status = POWER_SUPPLY_STATUS_FULL;
} else {
if (bat->pdata->enable_charger)
bat->pdata->enable_charger();
bat->status = POWER_SUPPLY_STATUS_CHARGING;
}
}
}
power_supply_changed(&bat->psy);
}
static irqreturn_t s3c_adc_bat_charged(int irq, void *dev_id)
{
schedule_delayed_work(&bat_work,
msecs_to_jiffies(JITTER_DELAY));
return IRQ_HANDLED;
}
static int s3c_adc_bat_probe(struct platform_device *pdev)
{
struct s3c_adc_client *client;
struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data;
int ret;
client = s3c_adc_register(pdev, NULL, NULL, 0);
if (IS_ERR(client)) {
dev_err(&pdev->dev, "cannot register adc\n");
return PTR_ERR(client);
}
platform_set_drvdata(pdev, client);
main_bat.client = client;
main_bat.pdata = pdata;
main_bat.volt_value = -1;
main_bat.cur_value = -1;
main_bat.cable_plugged = 0;
main_bat.status = POWER_SUPPLY_STATUS_DISCHARGING;
ret = power_supply_register(&pdev->dev, &main_bat.psy);
if (ret)
goto err_reg_main;
if (pdata->backup_volt_mult) {
backup_bat.client = client;
backup_bat.pdata = pdev->dev.platform_data;
backup_bat.volt_value = -1;
ret = power_supply_register(&pdev->dev, &backup_bat.psy);
if (ret)
goto err_reg_backup;
}
INIT_DELAYED_WORK(&bat_work, s3c_adc_bat_work);
if (pdata->gpio_charge_finished >= 0) {
ret = gpio_request(pdata->gpio_charge_finished, "charged");
if (ret)
goto err_gpio;
ret = request_irq(gpio_to_irq(pdata->gpio_charge_finished),
s3c_adc_bat_charged,
IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
"battery charged", NULL);
if (ret)
goto err_irq;
}
if (pdata->init) {
ret = pdata->init();
if (ret)
goto err_platform;
}
dev_info(&pdev->dev, "successfully loaded\n");
device_init_wakeup(&pdev->dev, 1);
/* Schedule timer to check current status */
schedule_delayed_work(&bat_work,
msecs_to_jiffies(JITTER_DELAY));
return 0;
err_platform:
if (pdata->gpio_charge_finished >= 0)
free_irq(gpio_to_irq(pdata->gpio_charge_finished), NULL);
err_irq:
if (pdata->gpio_charge_finished >= 0)
gpio_free(pdata->gpio_charge_finished);
err_gpio:
if (pdata->backup_volt_mult)
power_supply_unregister(&backup_bat.psy);
err_reg_backup:
power_supply_unregister(&main_bat.psy);
err_reg_main:
return ret;
}
static int s3c_adc_bat_remove(struct platform_device *pdev)
{
struct s3c_adc_client *client = platform_get_drvdata(pdev);
struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data;
power_supply_unregister(&main_bat.psy);
if (pdata->backup_volt_mult)
power_supply_unregister(&backup_bat.psy);
s3c_adc_release(client);
if (pdata->gpio_charge_finished >= 0) {
free_irq(gpio_to_irq(pdata->gpio_charge_finished), NULL);
gpio_free(pdata->gpio_charge_finished);
}
cancel_delayed_work(&bat_work);
if (pdata->exit)
pdata->exit();
return 0;
}
#ifdef CONFIG_PM
static int s3c_adc_bat_suspend(struct platform_device *pdev,
pm_message_t state)
{
struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data;
if (pdata->gpio_charge_finished >= 0) {
if (device_may_wakeup(&pdev->dev))
enable_irq_wake(
gpio_to_irq(pdata->gpio_charge_finished));
else {
disable_irq(gpio_to_irq(pdata->gpio_charge_finished));
main_bat.pdata->disable_charger();
}
}
return 0;
}
static int s3c_adc_bat_resume(struct platform_device *pdev)
{
struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data;
if (pdata->gpio_charge_finished >= 0) {
if (device_may_wakeup(&pdev->dev))
disable_irq_wake(
gpio_to_irq(pdata->gpio_charge_finished));
else
enable_irq(gpio_to_irq(pdata->gpio_charge_finished));
}
/* Schedule timer to check current status */
schedule_delayed_work(&bat_work,
msecs_to_jiffies(JITTER_DELAY));
return 0;
}
#else
#define s3c_adc_bat_suspend NULL
#define s3c_adc_bat_resume NULL
#endif
static struct platform_driver s3c_adc_bat_driver = {
.driver = {
.name = "s3c-adc-battery",
},
.probe = s3c_adc_bat_probe,
.remove = s3c_adc_bat_remove,
.suspend = s3c_adc_bat_suspend,
.resume = s3c_adc_bat_resume,
};
module_platform_driver(s3c_adc_bat_driver);
MODULE_AUTHOR("Vasily Khoruzhick <anarsoul@gmail.com>");
MODULE_DESCRIPTION("iPAQ H1930/H1940/RX1950 battery controller driver");
MODULE_LICENSE("GPL");
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