--- /dev/null
+/*
+ * 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");
projects / linux-2.6-omap-h63xx.git / commitdiff