[BATTERY] APM emulation driver for class batteries
Signed-off-by: Eugeny Boger <eugenyboger@dgap.mipt.ru> Signed-off-by: Anton Vorontsov <cbou@mail.ru> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
This commit is contained in:
Anton Vorontsov
David Woodhouse
parent
b2998049cf
commit
3788ec932b
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@ -21,4 +21,11 @@ config PDA_POWER
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one or two external power supplies (AC/USB) connected to main and
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backup batteries, and optional builtin charger.
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config APM_POWER
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tristate "APM emulation for class batteries"
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depends on APM_EMULATION
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help
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Say Y here to enable support APM status emulation using
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battery class devices.
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endif # POWER_SUPPLY
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@ -15,3 +15,4 @@ endif
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obj-$(CONFIG_POWER_SUPPLY) += power_supply.o
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obj-$(CONFIG_PDA_POWER) += pda_power.o
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obj-$(CONFIG_APM_POWER) += apm_power.o
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@ -0,0 +1,243 @@
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/*
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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/power_supply.h>
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#include <linux/apm-emulation.h>
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#define PSY_PROP(psy, prop, val) psy->get_property(psy, \
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POWER_SUPPLY_PROP_##prop, val)
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#define _MPSY_PROP(prop, val) main_battery->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 struct power_supply *main_battery;
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static void find_main_battery(void)
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{
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struct device *dev;
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struct power_supply *bat, *batm;
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union power_supply_propval full;
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int max_charge = 0;
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main_battery = NULL;
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batm = NULL;
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list_for_each_entry(dev, &power_supply_class->devices, node) {
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bat = dev_get_drvdata(dev);
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/* If none of battery devices cantains 'use_for_apm' flag,
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choice one with maximum design charge */
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if (!PSY_PROP(bat, CHARGE_FULL_DESIGN, &full)) {
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if (full.intval > max_charge) {
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batm = bat;
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max_charge = full.intval;
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}
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}
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if (bat->use_for_apm)
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main_battery = bat;
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}
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if (!main_battery)
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main_battery = batm;
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return;
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}
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static int calculate_time(int status)
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{
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union power_supply_propval charge_full, charge_empty;
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union power_supply_propval charge, I;
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if (MPSY_PROP(CHARGE_FULL, &charge_full)) {
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/* if battery can't report this property, use design value */
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if (MPSY_PROP(CHARGE_FULL_DESIGN, &charge_full))
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return -1;
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}
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if (MPSY_PROP(CHARGE_EMPTY, &charge_empty)) {
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/* if battery can't report this property, use design value */
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if (MPSY_PROP(CHARGE_EMPTY_DESIGN, &charge_empty))
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charge_empty.intval = 0;
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}
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if (MPSY_PROP(CHARGE_AVG, &charge)) {
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/* if battery can't report average value, use momentary */
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if (MPSY_PROP(CHARGE_NOW, &charge))
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return -1;
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}
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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 (status == POWER_SUPPLY_STATUS_CHARGING)
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return ((charge.intval - charge_full.intval) * 60L) /
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I.intval;
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else
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return -((charge.intval - charge_empty.intval) * 60L) /
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I.intval;
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}
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static int calculate_capacity(int using_charge)
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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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if (using_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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} else {
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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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}
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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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down(&power_supply_class->sem);
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find_main_battery();
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if (!main_battery) {
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up(&power_supply_class->sem);
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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(0);
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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(1);
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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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if (MPSY_PROP(TIME_TO_FULL_NOW, &time_to_full))
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info->time = calculate_time(status.intval);
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else
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info->time = time_to_full.intval / 60;
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}
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} else {
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if (MPSY_PROP(TIME_TO_EMPTY_AVG, &time_to_empty)) {
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if (MPSY_PROP(TIME_TO_EMPTY_NOW, &time_to_empty))
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info->time = calculate_time(status.intval);
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else
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info->time = time_to_empty.intval / 60;
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}
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}
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up(&power_supply_class->sem);
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return;
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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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return;
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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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