/* * 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> static DEFINE_MUTEX(apm_mutex); #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; struct find_bat_param { struct power_supply *main; struct power_supply *bat; struct power_supply *max_charge_bat; struct power_supply *max_energy_bat; union power_supply_propval full; int max_charge; int max_energy; }; static int __find_main_battery(struct device *dev, void *data) { struct find_bat_param *bp = (struct find_bat_param *)data; bp->bat = dev_get_drvdata(dev); if (bp->bat->use_for_apm) { /* nice, we explicitly asked to report this battery. */ bp->main = bp->bat; return 1; } if (!PSY_PROP(bp->bat, CHARGE_FULL_DESIGN, &bp->full) || !PSY_PROP(bp->bat, CHARGE_FULL, &bp->full)) { if (bp->full.intval > bp->max_charge) { bp->max_charge_bat = bp->bat; bp->max_charge = bp->full.intval; } } else if (!PSY_PROP(bp->bat, ENERGY_FULL_DESIGN, &bp->full) || !PSY_PROP(bp->bat, ENERGY_FULL, &bp->full)) { if (bp->full.intval > bp->max_energy) { bp->max_energy_bat = bp->bat; bp->max_energy = bp->full.intval; } } return 0; } static void find_main_battery(void) { struct find_bat_param bp; int error; memset(&bp, 0, sizeof(struct find_bat_param)); main_battery = NULL; bp.main = main_battery; error = class_for_each_device(power_supply_class, &bp, __find_main_battery); if (error) { main_battery = bp.main; return; } if ((bp.max_energy_bat && bp.max_charge_bat) && (bp.max_energy_bat != bp.max_charge_bat)) { /* try guess battery with more capacity */ if (!PSY_PROP(bp.max_charge_bat, VOLTAGE_MAX_DESIGN, &bp.full)) { if (bp.max_energy > bp.max_charge * bp.full.intval) main_battery = bp.max_energy_bat; else main_battery = bp.max_charge_bat; } else if (!PSY_PROP(bp.max_energy_bat, VOLTAGE_MAX_DESIGN, &bp.full)) { if (bp.max_charge > bp.max_energy / bp.full.intval) main_battery = bp.max_charge_bat; else main_battery = bp.max_energy_bat; } else { /* give up, choice any */ main_battery = bp.max_energy_bat; } } else if (bp.max_charge_bat) { main_battery = bp.max_charge_bat; } else if (bp.max_energy_bat) { main_battery = bp.max_energy_bat; } else { /* give up, try the last if any */ main_battery = bp.bat; } } static int calculate_time(int status, int using_charge) { union power_supply_propval full; union power_supply_propval empty; union power_supply_propval cur; union power_supply_propval I; enum power_supply_property full_prop; enum power_supply_property full_design_prop; enum power_supply_property empty_prop; enum power_supply_property empty_design_prop; enum power_supply_property cur_avg_prop; enum power_supply_property cur_now_prop; if (MPSY_PROP(CURRENT_AVG, &I)) { /* if battery can't report average value, use momentary */ if (MPSY_PROP(CURRENT_NOW, &I)) return -1; } if (using_charge) { full_prop = POWER_SUPPLY_PROP_CHARGE_FULL; full_design_prop = POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN; empty_prop = POWER_SUPPLY_PROP_CHARGE_EMPTY; empty_design_prop = POWER_SUPPLY_PROP_CHARGE_EMPTY; cur_avg_prop = POWER_SUPPLY_PROP_CHARGE_AVG; cur_now_prop = POWER_SUPPLY_PROP_CHARGE_NOW; } else { full_prop = POWER_SUPPLY_PROP_ENERGY_FULL; full_design_prop = POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN; empty_prop = POWER_SUPPLY_PROP_ENERGY_EMPTY; empty_design_prop = POWER_SUPPLY_PROP_CHARGE_EMPTY; cur_avg_prop = POWER_SUPPLY_PROP_ENERGY_AVG; cur_now_prop = POWER_SUPPLY_PROP_ENERGY_NOW; } 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(empty_prop, &empty)) { /* if battery can't report this property, use design value */ if (_MPSY_PROP(empty_design_prop, &empty)) empty.intval = 0; } if (_MPSY_PROP(cur_avg_prop, &cur)) { /* if battery can't report average value, use momentary */ if (_MPSY_PROP(cur_now_prop, &cur)) return -1; } if (status == POWER_SUPPLY_STATUS_CHARGING) return ((cur.intval - full.intval) * 60L) / I.intval; else return -((cur.intval - 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; mutex_lock(&apm_mutex); find_main_battery(); if (!main_battery) { mutex_unlock(&apm_mutex); 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) || !MPSY_PROP(TIME_TO_FULL_NOW, &time_to_full)) { info->time = time_to_full.intval / 60; } else { info->time = calculate_time(status.intval, 0); if (info->time == -1) info->time = calculate_time(status.intval, 1); } } else { if (!MPSY_PROP(TIME_TO_EMPTY_AVG, &time_to_empty) || !MPSY_PROP(TIME_TO_EMPTY_NOW, &time_to_empty)) { info->time = time_to_empty.intval / 60; } else { info->time = calculate_time(status.intval, 0); if (info->time == -1) info->time = calculate_time(status.intval, 1); } } mutex_unlock(&apm_mutex); } 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");