244 lines
6.3 KiB
C
244 lines
6.3 KiB
C
/*
|
|
* Copyright © 2007 Anton Vorontsov <cbou@mail.ru>
|
|
* Copyright © 2007 Eugeny Boger <eugenyboger@dgap.mipt.ru>
|
|
*
|
|
* Author: Eugeny Boger <eugenyboger@dgap.mipt.ru>
|
|
*
|
|
* Use consistent with the GNU GPL is permitted,
|
|
* provided that this copyright notice is
|
|
* preserved in its entirety in all copies and derived works.
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/power_supply.h>
|
|
#include <linux/apm-emulation.h>
|
|
|
|
#define PSY_PROP(psy, prop, val) psy->get_property(psy, \
|
|
POWER_SUPPLY_PROP_##prop, val)
|
|
|
|
#define _MPSY_PROP(prop, val) main_battery->get_property(main_battery, \
|
|
prop, val)
|
|
|
|
#define MPSY_PROP(prop, val) _MPSY_PROP(POWER_SUPPLY_PROP_##prop, val)
|
|
|
|
static struct power_supply *main_battery;
|
|
|
|
static void find_main_battery(void)
|
|
{
|
|
struct device *dev;
|
|
struct power_supply *bat, *batm;
|
|
union power_supply_propval full;
|
|
int max_charge = 0;
|
|
|
|
main_battery = NULL;
|
|
batm = NULL;
|
|
list_for_each_entry(dev, &power_supply_class->devices, node) {
|
|
bat = dev_get_drvdata(dev);
|
|
/* If none of battery devices cantains 'use_for_apm' flag,
|
|
choice one with maximum design charge */
|
|
if (!PSY_PROP(bat, CHARGE_FULL_DESIGN, &full)) {
|
|
if (full.intval > max_charge) {
|
|
batm = bat;
|
|
max_charge = full.intval;
|
|
}
|
|
}
|
|
|
|
if (bat->use_for_apm)
|
|
main_battery = bat;
|
|
}
|
|
if (!main_battery)
|
|
main_battery = batm;
|
|
|
|
return;
|
|
}
|
|
|
|
static int calculate_time(int status)
|
|
{
|
|
union power_supply_propval charge_full, charge_empty;
|
|
union power_supply_propval charge, I;
|
|
|
|
if (MPSY_PROP(CHARGE_FULL, &charge_full)) {
|
|
/* if battery can't report this property, use design value */
|
|
if (MPSY_PROP(CHARGE_FULL_DESIGN, &charge_full))
|
|
return -1;
|
|
}
|
|
|
|
if (MPSY_PROP(CHARGE_EMPTY, &charge_empty)) {
|
|
/* if battery can't report this property, use design value */
|
|
if (MPSY_PROP(CHARGE_EMPTY_DESIGN, &charge_empty))
|
|
charge_empty.intval = 0;
|
|
}
|
|
|
|
if (MPSY_PROP(CHARGE_AVG, &charge)) {
|
|
/* if battery can't report average value, use momentary */
|
|
if (MPSY_PROP(CHARGE_NOW, &charge))
|
|
return -1;
|
|
}
|
|
|
|
if (MPSY_PROP(CURRENT_AVG, &I)) {
|
|
/* if battery can't report average value, use momentary */
|
|
if (MPSY_PROP(CURRENT_NOW, &I))
|
|
return -1;
|
|
}
|
|
|
|
if (status == POWER_SUPPLY_STATUS_CHARGING)
|
|
return ((charge.intval - charge_full.intval) * 60L) /
|
|
I.intval;
|
|
else
|
|
return -((charge.intval - charge_empty.intval) * 60L) /
|
|
I.intval;
|
|
}
|
|
|
|
static int calculate_capacity(int using_charge)
|
|
{
|
|
enum power_supply_property full_prop, empty_prop;
|
|
enum power_supply_property full_design_prop, empty_design_prop;
|
|
enum power_supply_property now_prop, avg_prop;
|
|
union power_supply_propval empty, full, cur;
|
|
int ret;
|
|
|
|
if (using_charge) {
|
|
full_prop = POWER_SUPPLY_PROP_CHARGE_FULL;
|
|
empty_prop = POWER_SUPPLY_PROP_CHARGE_EMPTY;
|
|
full_design_prop = POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN;
|
|
empty_design_prop = POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN;
|
|
now_prop = POWER_SUPPLY_PROP_CHARGE_NOW;
|
|
avg_prop = POWER_SUPPLY_PROP_CHARGE_AVG;
|
|
} else {
|
|
full_prop = POWER_SUPPLY_PROP_ENERGY_FULL;
|
|
empty_prop = POWER_SUPPLY_PROP_ENERGY_EMPTY;
|
|
full_design_prop = POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN;
|
|
empty_design_prop = POWER_SUPPLY_PROP_ENERGY_EMPTY_DESIGN;
|
|
now_prop = POWER_SUPPLY_PROP_ENERGY_NOW;
|
|
avg_prop = POWER_SUPPLY_PROP_ENERGY_AVG;
|
|
}
|
|
|
|
if (_MPSY_PROP(full_prop, &full)) {
|
|
/* if battery can't report this property, use design value */
|
|
if (_MPSY_PROP(full_design_prop, &full))
|
|
return -1;
|
|
}
|
|
|
|
if (_MPSY_PROP(avg_prop, &cur)) {
|
|
/* if battery can't report average value, use momentary */
|
|
if (_MPSY_PROP(now_prop, &cur))
|
|
return -1;
|
|
}
|
|
|
|
if (_MPSY_PROP(empty_prop, &empty)) {
|
|
/* if battery can't report this property, use design value */
|
|
if (_MPSY_PROP(empty_design_prop, &empty))
|
|
empty.intval = 0;
|
|
}
|
|
|
|
if (full.intval - empty.intval)
|
|
ret = ((cur.intval - empty.intval) * 100L) /
|
|
(full.intval - empty.intval);
|
|
else
|
|
return -1;
|
|
|
|
if (ret > 100)
|
|
return 100;
|
|
else if (ret < 0)
|
|
return 0;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void apm_battery_apm_get_power_status(struct apm_power_info *info)
|
|
{
|
|
union power_supply_propval status;
|
|
union power_supply_propval capacity, time_to_full, time_to_empty;
|
|
|
|
down(&power_supply_class->sem);
|
|
find_main_battery();
|
|
if (!main_battery) {
|
|
up(&power_supply_class->sem);
|
|
return;
|
|
}
|
|
|
|
/* status */
|
|
|
|
if (MPSY_PROP(STATUS, &status))
|
|
status.intval = POWER_SUPPLY_STATUS_UNKNOWN;
|
|
|
|
/* ac line status */
|
|
|
|
if ((status.intval == POWER_SUPPLY_STATUS_CHARGING) ||
|
|
(status.intval == POWER_SUPPLY_STATUS_NOT_CHARGING) ||
|
|
(status.intval == POWER_SUPPLY_STATUS_FULL))
|
|
info->ac_line_status = APM_AC_ONLINE;
|
|
else
|
|
info->ac_line_status = APM_AC_OFFLINE;
|
|
|
|
/* battery life (i.e. capacity, in percents) */
|
|
|
|
if (MPSY_PROP(CAPACITY, &capacity) == 0) {
|
|
info->battery_life = capacity.intval;
|
|
} else {
|
|
/* try calculate using energy */
|
|
info->battery_life = calculate_capacity(0);
|
|
/* if failed try calculate using charge instead */
|
|
if (info->battery_life == -1)
|
|
info->battery_life = calculate_capacity(1);
|
|
}
|
|
|
|
/* charging status */
|
|
|
|
if (status.intval == POWER_SUPPLY_STATUS_CHARGING) {
|
|
info->battery_status = APM_BATTERY_STATUS_CHARGING;
|
|
} else {
|
|
if (info->battery_life > 50)
|
|
info->battery_status = APM_BATTERY_STATUS_HIGH;
|
|
else if (info->battery_life > 5)
|
|
info->battery_status = APM_BATTERY_STATUS_LOW;
|
|
else
|
|
info->battery_status = APM_BATTERY_STATUS_CRITICAL;
|
|
}
|
|
info->battery_flag = info->battery_status;
|
|
|
|
/* time */
|
|
|
|
info->units = APM_UNITS_MINS;
|
|
|
|
if (status.intval == POWER_SUPPLY_STATUS_CHARGING) {
|
|
if (MPSY_PROP(TIME_TO_FULL_AVG, &time_to_full)) {
|
|
if (MPSY_PROP(TIME_TO_FULL_NOW, &time_to_full))
|
|
info->time = calculate_time(status.intval);
|
|
else
|
|
info->time = time_to_full.intval / 60;
|
|
}
|
|
} else {
|
|
if (MPSY_PROP(TIME_TO_EMPTY_AVG, &time_to_empty)) {
|
|
if (MPSY_PROP(TIME_TO_EMPTY_NOW, &time_to_empty))
|
|
info->time = calculate_time(status.intval);
|
|
else
|
|
info->time = time_to_empty.intval / 60;
|
|
}
|
|
}
|
|
|
|
up(&power_supply_class->sem);
|
|
return;
|
|
}
|
|
|
|
static int __init apm_battery_init(void)
|
|
{
|
|
printk(KERN_INFO "APM Battery Driver\n");
|
|
|
|
apm_get_power_status = apm_battery_apm_get_power_status;
|
|
return 0;
|
|
}
|
|
|
|
static void __exit apm_battery_exit(void)
|
|
{
|
|
apm_get_power_status = NULL;
|
|
return;
|
|
}
|
|
|
|
module_init(apm_battery_init);
|
|
module_exit(apm_battery_exit);
|
|
|
|
MODULE_AUTHOR("Eugeny Boger <eugenyboger@dgap.mipt.ru>");
|
|
MODULE_DESCRIPTION("APM emulation driver for battery monitoring class");
|
|
MODULE_LICENSE("GPL");
|