| /* |
| * 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; |
| } |
| |
| 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); |
| } |
| |
| 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; |
| } |
| |
| 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"); |