377 lines
10 KiB
C
377 lines
10 KiB
C
/*
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* Copyright © 2007 Anton Vorontsov <cbou@mail.ru>
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* Copyright © 2007 Eugeny Boger <eugenyboger@dgap.mipt.ru>
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*
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* Author: Eugeny Boger <eugenyboger@dgap.mipt.ru>
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*
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* Use consistent with the GNU GPL is permitted,
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* provided that this copyright notice is
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* preserved in its entirety in all copies and derived works.
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*/
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/power_supply.h>
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#include <linux/apm-emulation.h>
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#define PSY_PROP(psy, prop, val) (power_supply_get_property(psy, \
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POWER_SUPPLY_PROP_##prop, val))
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#define _MPSY_PROP(prop, val) (power_supply_get_property(main_battery, \
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prop, val))
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#define MPSY_PROP(prop, val) _MPSY_PROP(POWER_SUPPLY_PROP_##prop, val)
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static DEFINE_MUTEX(apm_mutex);
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static struct power_supply *main_battery;
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enum apm_source {
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SOURCE_ENERGY,
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SOURCE_CHARGE,
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SOURCE_VOLTAGE,
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};
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struct find_bat_param {
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struct power_supply *main;
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struct power_supply *bat;
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struct power_supply *max_charge_bat;
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struct power_supply *max_energy_bat;
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union power_supply_propval full;
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int max_charge;
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int max_energy;
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};
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static int __find_main_battery(struct device *dev, void *data)
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{
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struct find_bat_param *bp = (struct find_bat_param *)data;
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bp->bat = dev_get_drvdata(dev);
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if (bp->bat->desc->use_for_apm) {
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/* nice, we explicitly asked to report this battery. */
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bp->main = bp->bat;
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return 1;
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}
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if (!PSY_PROP(bp->bat, CHARGE_FULL_DESIGN, &bp->full) ||
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!PSY_PROP(bp->bat, CHARGE_FULL, &bp->full)) {
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if (bp->full.intval > bp->max_charge) {
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bp->max_charge_bat = bp->bat;
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bp->max_charge = bp->full.intval;
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}
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} else if (!PSY_PROP(bp->bat, ENERGY_FULL_DESIGN, &bp->full) ||
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!PSY_PROP(bp->bat, ENERGY_FULL, &bp->full)) {
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if (bp->full.intval > bp->max_energy) {
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bp->max_energy_bat = bp->bat;
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bp->max_energy = bp->full.intval;
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}
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}
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return 0;
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}
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static void find_main_battery(void)
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{
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struct find_bat_param bp;
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int error;
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memset(&bp, 0, sizeof(struct find_bat_param));
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main_battery = NULL;
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bp.main = main_battery;
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error = class_for_each_device(power_supply_class, NULL, &bp,
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__find_main_battery);
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if (error) {
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main_battery = bp.main;
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return;
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}
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if ((bp.max_energy_bat && bp.max_charge_bat) &&
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(bp.max_energy_bat != bp.max_charge_bat)) {
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/* try guess battery with more capacity */
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if (!PSY_PROP(bp.max_charge_bat, VOLTAGE_MAX_DESIGN,
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&bp.full)) {
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if (bp.max_energy > bp.max_charge * bp.full.intval)
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main_battery = bp.max_energy_bat;
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else
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main_battery = bp.max_charge_bat;
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} else if (!PSY_PROP(bp.max_energy_bat, VOLTAGE_MAX_DESIGN,
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&bp.full)) {
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if (bp.max_charge > bp.max_energy / bp.full.intval)
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main_battery = bp.max_charge_bat;
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else
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main_battery = bp.max_energy_bat;
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} else {
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/* give up, choice any */
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main_battery = bp.max_energy_bat;
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}
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} else if (bp.max_charge_bat) {
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main_battery = bp.max_charge_bat;
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} else if (bp.max_energy_bat) {
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main_battery = bp.max_energy_bat;
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} else {
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/* give up, try the last if any */
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main_battery = bp.bat;
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}
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}
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static int do_calculate_time(int status, enum apm_source source)
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{
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union power_supply_propval full;
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union power_supply_propval empty;
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union power_supply_propval cur;
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union power_supply_propval I;
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enum power_supply_property full_prop;
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enum power_supply_property full_design_prop;
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enum power_supply_property empty_prop;
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enum power_supply_property empty_design_prop;
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enum power_supply_property cur_avg_prop;
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enum power_supply_property cur_now_prop;
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if (MPSY_PROP(CURRENT_AVG, &I)) {
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/* if battery can't report average value, use momentary */
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if (MPSY_PROP(CURRENT_NOW, &I))
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return -1;
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}
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if (!I.intval)
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return 0;
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switch (source) {
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case SOURCE_CHARGE:
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full_prop = POWER_SUPPLY_PROP_CHARGE_FULL;
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full_design_prop = POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN;
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empty_prop = POWER_SUPPLY_PROP_CHARGE_EMPTY;
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empty_design_prop = POWER_SUPPLY_PROP_CHARGE_EMPTY;
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cur_avg_prop = POWER_SUPPLY_PROP_CHARGE_AVG;
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cur_now_prop = POWER_SUPPLY_PROP_CHARGE_NOW;
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break;
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case SOURCE_ENERGY:
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full_prop = POWER_SUPPLY_PROP_ENERGY_FULL;
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full_design_prop = POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN;
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empty_prop = POWER_SUPPLY_PROP_ENERGY_EMPTY;
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empty_design_prop = POWER_SUPPLY_PROP_CHARGE_EMPTY;
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cur_avg_prop = POWER_SUPPLY_PROP_ENERGY_AVG;
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cur_now_prop = POWER_SUPPLY_PROP_ENERGY_NOW;
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break;
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case SOURCE_VOLTAGE:
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full_prop = POWER_SUPPLY_PROP_VOLTAGE_MAX;
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full_design_prop = POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN;
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empty_prop = POWER_SUPPLY_PROP_VOLTAGE_MIN;
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empty_design_prop = POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN;
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cur_avg_prop = POWER_SUPPLY_PROP_VOLTAGE_AVG;
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cur_now_prop = POWER_SUPPLY_PROP_VOLTAGE_NOW;
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break;
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default:
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printk(KERN_ERR "Unsupported source: %d\n", source);
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return -1;
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}
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if (_MPSY_PROP(full_prop, &full)) {
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/* if battery can't report this property, use design value */
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if (_MPSY_PROP(full_design_prop, &full))
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return -1;
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}
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if (_MPSY_PROP(empty_prop, &empty)) {
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/* if battery can't report this property, use design value */
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if (_MPSY_PROP(empty_design_prop, &empty))
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empty.intval = 0;
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}
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if (_MPSY_PROP(cur_avg_prop, &cur)) {
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/* if battery can't report average value, use momentary */
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if (_MPSY_PROP(cur_now_prop, &cur))
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return -1;
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}
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if (status == POWER_SUPPLY_STATUS_CHARGING)
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return ((cur.intval - full.intval) * 60L) / I.intval;
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else
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return -((cur.intval - empty.intval) * 60L) / I.intval;
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}
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static int calculate_time(int status)
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{
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int time;
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time = do_calculate_time(status, SOURCE_ENERGY);
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if (time != -1)
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return time;
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time = do_calculate_time(status, SOURCE_CHARGE);
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if (time != -1)
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return time;
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time = do_calculate_time(status, SOURCE_VOLTAGE);
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if (time != -1)
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return time;
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return -1;
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}
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static int calculate_capacity(enum apm_source source)
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{
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enum power_supply_property full_prop, empty_prop;
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enum power_supply_property full_design_prop, empty_design_prop;
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enum power_supply_property now_prop, avg_prop;
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union power_supply_propval empty, full, cur;
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int ret;
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switch (source) {
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case SOURCE_CHARGE:
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full_prop = POWER_SUPPLY_PROP_CHARGE_FULL;
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empty_prop = POWER_SUPPLY_PROP_CHARGE_EMPTY;
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full_design_prop = POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN;
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empty_design_prop = POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN;
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now_prop = POWER_SUPPLY_PROP_CHARGE_NOW;
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avg_prop = POWER_SUPPLY_PROP_CHARGE_AVG;
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break;
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case SOURCE_ENERGY:
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full_prop = POWER_SUPPLY_PROP_ENERGY_FULL;
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empty_prop = POWER_SUPPLY_PROP_ENERGY_EMPTY;
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full_design_prop = POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN;
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empty_design_prop = POWER_SUPPLY_PROP_ENERGY_EMPTY_DESIGN;
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now_prop = POWER_SUPPLY_PROP_ENERGY_NOW;
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avg_prop = POWER_SUPPLY_PROP_ENERGY_AVG;
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break;
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case SOURCE_VOLTAGE:
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full_prop = POWER_SUPPLY_PROP_VOLTAGE_MAX;
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empty_prop = POWER_SUPPLY_PROP_VOLTAGE_MIN;
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full_design_prop = POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN;
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empty_design_prop = POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN;
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now_prop = POWER_SUPPLY_PROP_VOLTAGE_NOW;
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avg_prop = POWER_SUPPLY_PROP_VOLTAGE_AVG;
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break;
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default:
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printk(KERN_ERR "Unsupported source: %d\n", source);
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return -1;
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}
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if (_MPSY_PROP(full_prop, &full)) {
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/* if battery can't report this property, use design value */
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if (_MPSY_PROP(full_design_prop, &full))
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return -1;
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}
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if (_MPSY_PROP(avg_prop, &cur)) {
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/* if battery can't report average value, use momentary */
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if (_MPSY_PROP(now_prop, &cur))
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return -1;
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}
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if (_MPSY_PROP(empty_prop, &empty)) {
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/* if battery can't report this property, use design value */
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if (_MPSY_PROP(empty_design_prop, &empty))
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empty.intval = 0;
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}
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if (full.intval - empty.intval)
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ret = ((cur.intval - empty.intval) * 100L) /
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(full.intval - empty.intval);
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else
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return -1;
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if (ret > 100)
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return 100;
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else if (ret < 0)
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return 0;
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return ret;
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}
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static void apm_battery_apm_get_power_status(struct apm_power_info *info)
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{
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union power_supply_propval status;
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union power_supply_propval capacity, time_to_full, time_to_empty;
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mutex_lock(&apm_mutex);
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find_main_battery();
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if (!main_battery) {
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mutex_unlock(&apm_mutex);
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return;
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}
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/* status */
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if (MPSY_PROP(STATUS, &status))
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status.intval = POWER_SUPPLY_STATUS_UNKNOWN;
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/* ac line status */
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if ((status.intval == POWER_SUPPLY_STATUS_CHARGING) ||
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(status.intval == POWER_SUPPLY_STATUS_NOT_CHARGING) ||
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(status.intval == POWER_SUPPLY_STATUS_FULL))
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info->ac_line_status = APM_AC_ONLINE;
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else
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info->ac_line_status = APM_AC_OFFLINE;
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/* battery life (i.e. capacity, in percents) */
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if (MPSY_PROP(CAPACITY, &capacity) == 0) {
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info->battery_life = capacity.intval;
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} else {
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/* try calculate using energy */
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info->battery_life = calculate_capacity(SOURCE_ENERGY);
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/* if failed try calculate using charge instead */
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if (info->battery_life == -1)
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info->battery_life = calculate_capacity(SOURCE_CHARGE);
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if (info->battery_life == -1)
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info->battery_life = calculate_capacity(SOURCE_VOLTAGE);
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}
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/* charging status */
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if (status.intval == POWER_SUPPLY_STATUS_CHARGING) {
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info->battery_status = APM_BATTERY_STATUS_CHARGING;
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} else {
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if (info->battery_life > 50)
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info->battery_status = APM_BATTERY_STATUS_HIGH;
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else if (info->battery_life > 5)
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info->battery_status = APM_BATTERY_STATUS_LOW;
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else
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info->battery_status = APM_BATTERY_STATUS_CRITICAL;
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}
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info->battery_flag = info->battery_status;
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/* time */
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info->units = APM_UNITS_MINS;
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if (status.intval == POWER_SUPPLY_STATUS_CHARGING) {
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if (!MPSY_PROP(TIME_TO_FULL_AVG, &time_to_full) ||
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!MPSY_PROP(TIME_TO_FULL_NOW, &time_to_full))
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info->time = time_to_full.intval / 60;
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else
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info->time = calculate_time(status.intval);
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} else {
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if (!MPSY_PROP(TIME_TO_EMPTY_AVG, &time_to_empty) ||
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!MPSY_PROP(TIME_TO_EMPTY_NOW, &time_to_empty))
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info->time = time_to_empty.intval / 60;
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else
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info->time = calculate_time(status.intval);
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}
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mutex_unlock(&apm_mutex);
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}
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static int __init apm_battery_init(void)
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{
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printk(KERN_INFO "APM Battery Driver\n");
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apm_get_power_status = apm_battery_apm_get_power_status;
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return 0;
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}
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static void __exit apm_battery_exit(void)
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{
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apm_get_power_status = NULL;
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}
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module_init(apm_battery_init);
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module_exit(apm_battery_exit);
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MODULE_AUTHOR("Eugeny Boger <eugenyboger@dgap.mipt.ru>");
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MODULE_DESCRIPTION("APM emulation driver for battery monitoring class");
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MODULE_LICENSE("GPL");
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