power supply : use class iteration api

[safe/jmp/linux-2.6] / drivers / power / apm_power.c

diff --git a/drivers/power/apm_power.c b/drivers/power/apm_power.c
index bbf3ee1..7e29b90 100644 (file)
--- 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)