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path: root/drivers/power/apm_power.c
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Diffstat (limited to 'drivers/power/apm_power.c')
-rw-r--r--drivers/power/apm_power.c116
1 files changed, 68 insertions, 48 deletions
diff --git a/drivers/power/apm_power.c b/drivers/power/apm_power.c
index bbf3ee1..7e29b90 100644
--- a/drivers/power/apm_power.c
+++ b/drivers/power/apm_power.c
@@ -13,6 +13,7 @@
#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)
@@ -23,67 +24,86 @@
static struct power_supply *main_battery;
-static void find_main_battery(void)
-{
- struct device *dev;
- struct power_supply *bat = NULL;
- struct power_supply *max_charge_bat = NULL;
- struct power_supply *max_energy_bat = NULL;
+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 = 0;
- int max_energy = 0;
+ int max_charge;
+ int max_energy;
+};
- main_battery = NULL;
+static int __find_main_battery(struct device *dev, void *data)
+{
+ struct find_bat_param *bp = (struct find_bat_param *)data;
- list_for_each_entry(dev, &power_supply_class->devices, node) {
- bat = dev_get_drvdata(dev);
+ bp->bat = dev_get_drvdata(dev);
- if (bat->use_for_apm) {
- /* nice, we explicitly asked to report this battery. */
- main_battery = bat;
- return;
- }
+ if (bp->bat->use_for_apm) {
+ /* nice, we explicitly asked to report this battery. */
+ bp->main = bp->bat;
+ return 1;
+ }
- if (!PSY_PROP(bat, CHARGE_FULL_DESIGN, &full) ||
- !PSY_PROP(bat, CHARGE_FULL, &full)) {
- if (full.intval > max_charge) {
- max_charge_bat = bat;
- max_charge = full.intval;
- }
- } else if (!PSY_PROP(bat, ENERGY_FULL_DESIGN, &full) ||
- !PSY_PROP(bat, ENERGY_FULL, &full)) {
- if (full.intval > max_energy) {
- max_energy_bat = bat;
- max_energy = full.intval;
- }
+ 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 ((max_energy_bat && max_charge_bat) &&
- (max_energy_bat != max_charge_bat)) {
+ 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(max_charge_bat, VOLTAGE_MAX_DESIGN, &full)) {
- if (max_energy > max_charge * full.intval)
- main_battery = max_energy_bat;
+ 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 = max_charge_bat;
- } else if (!PSY_PROP(max_energy_bat, VOLTAGE_MAX_DESIGN,
- &full)) {
- if (max_charge > max_energy / full.intval)
- main_battery = max_charge_bat;
+ 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 = max_energy_bat;
+ main_battery = bp.max_energy_bat;
} else {
/* give up, choice any */
- main_battery = max_energy_bat;
+ main_battery = bp.max_energy_bat;
}
- } else if (max_charge_bat) {
- main_battery = max_charge_bat;
- } else if (max_energy_bat) {
- main_battery = 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 = bat;
+ main_battery = bp.bat;
}
}
@@ -207,10 +227,10 @@ 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);
+ mutex_lock(&apm_mutex);
find_main_battery();
if (!main_battery) {
- up(&power_supply_class->sem);
+ mutex_unlock(&apm_mutex);
return;
}
@@ -278,7 +298,7 @@ static void apm_battery_apm_get_power_status(struct apm_power_info *info)
}
}
- up(&power_supply_class->sem);
+ mutex_unlock(&apm_mutex);
}
static int __init apm_battery_init(void)
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