apm_power: support using VOLTAGE_* properties for apm calculations

It's pretty dummy, but useful for batteries for which we can only
get voltages.

Signed-off-by: Dmitry Baryshkov <dbaryshkov@gmail.com>
Signed-off-by: Anton Vorontsov <cbou@mail.ru>

1 files changed, 70 insertions, 21 deletions

diff --git a/drivers/power/apm_power.c b/drivers/power/apm_power.c
index 7e29b90a4f63..a832a9a05c66 100644
--- a/drivers/power/apm_power.c
+++ b/drivers/power/apm_power.c
@@ -13,7 +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)
 
@@ -22,8 +22,15 @@ static DEFINE_MUTEX(apm_mutex);
 
 #define MPSY_PROP(prop, val) _MPSY_PROP(POWER_SUPPLY_PROP_##prop, val)
 
+static DEFINE_MUTEX(apm_mutex);
 static struct power_supply *main_battery;
 
+enum apm_source {
+        SOURCE_ENERGY,
+        SOURCE_CHARGE,
+        SOURCE_VOLTAGE,
+};
+
 struct find_bat_param {
         struct power_supply *main;
         struct power_supply *bat;
@@ -107,7 +114,7 @@ static void find_main_battery(void)
         }
 }
 
-static int calculate_time(int status, int using_charge)
+static int do_calculate_time(int status, enum apm_source source)
 {
         union power_supply_propval full;
         union power_supply_propval empty;
@@ -126,20 +133,34 @@ static int calculate_time(int status, int using_charge)
                         return -1;
         }
 
-        if (using_charge) {
+        switch (source) {
+        case SOURCE_CHARGE:
                 full_prop = POWER_SUPPLY_PROP_CHARGE_FULL;
                 full_design_prop = POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN;
                 empty_prop = POWER_SUPPLY_PROP_CHARGE_EMPTY;
                 empty_design_prop = POWER_SUPPLY_PROP_CHARGE_EMPTY;
                 cur_avg_prop = POWER_SUPPLY_PROP_CHARGE_AVG;
                 cur_now_prop = POWER_SUPPLY_PROP_CHARGE_NOW;
-        } else {
+                break;
+        case SOURCE_ENERGY:
                 full_prop = POWER_SUPPLY_PROP_ENERGY_FULL;
                 full_design_prop = POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN;
                 empty_prop = POWER_SUPPLY_PROP_ENERGY_EMPTY;
                 empty_design_prop = POWER_SUPPLY_PROP_CHARGE_EMPTY;
                 cur_avg_prop = POWER_SUPPLY_PROP_ENERGY_AVG;
                 cur_now_prop = POWER_SUPPLY_PROP_ENERGY_NOW;
+                break;
+        case SOURCE_VOLTAGE:
+                full_prop = POWER_SUPPLY_PROP_VOLTAGE_MAX;
+                full_design_prop = POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN;
+                empty_prop = POWER_SUPPLY_PROP_VOLTAGE_MIN;
+                empty_design_prop = POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN;
+                cur_avg_prop = POWER_SUPPLY_PROP_VOLTAGE_AVG;
+                cur_now_prop = POWER_SUPPLY_PROP_VOLTAGE_NOW;
+                break;
+        default:
+                printk(KERN_ERR "Unsupported source: %d\n", source);
+                return -1;
         }
 
         if (_MPSY_PROP(full_prop, &full)) {
@@ -166,7 +187,26 @@ static int calculate_time(int status, int using_charge)
                 return -((cur.intval - empty.intval) * 60L) / I.intval;
 }
 
-static int calculate_capacity(int using_charge)
+static int calculate_time(int status)
+{
+        int time;
+
+        time = do_calculate_time(status, SOURCE_ENERGY);
+        if (time != -1)
+                return time;
+
+        time = do_calculate_time(status, SOURCE_CHARGE);
+        if (time != -1)
+                return time;
+
+        time = do_calculate_time(status, SOURCE_VOLTAGE);
+        if (time != -1)
+                return time;
+
+        return -1;
+}
+
+static int calculate_capacity(enum apm_source source)
 {
         enum power_supply_property full_prop, empty_prop;
         enum power_supply_property full_design_prop, empty_design_prop;
@@ -174,20 +214,33 @@ static int calculate_capacity(int using_charge)
         union power_supply_propval empty, full, cur;
         int ret;
 
-        if (using_charge) {
+        switch (source) {
+        case SOURCE_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 {
+                break;
+        case SOURCE_ENERGY:
                 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;
+        case SOURCE_VOLTAGE:
+                full_prop = POWER_SUPPLY_PROP_VOLTAGE_MAX;
+                empty_prop = POWER_SUPPLY_PROP_VOLTAGE_MIN;
+                full_design_prop = POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN;
+                empty_design_prop = POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN;
+                now_prop = POWER_SUPPLY_PROP_VOLTAGE_NOW;
+                avg_prop = POWER_SUPPLY_PROP_VOLTAGE_AVG;
+                break;
+        default:
+                printk(KERN_ERR "Unsupported source: %d\n", source);
+                return -1;
         }
 
         if (_MPSY_PROP(full_prop, &full)) {
@@ -254,10 +307,12 @@ static void apm_battery_apm_get_power_status(struct apm_power_info *info)
                 info->battery_life = capacity.intval;
         } else {
                 /* try calculate using energy */
-                info->battery_life = calculate_capacity(0);
+                info->battery_life = calculate_capacity(SOURCE_ENERGY);
                 /* if failed try calculate using charge instead */
                 if (info->battery_life == -1)
-                        info->battery_life = calculate_capacity(1);
+                        info->battery_life = calculate_capacity(SOURCE_CHARGE);
+                if (info->battery_life == -1)
+                        info->battery_life = calculate_capacity(SOURCE_VOLTAGE);
         }
 
         /* charging status */
@@ -280,22 +335,16 @@ static void apm_battery_apm_get_power_status(struct apm_power_info *info)
 
         if (status.intval == POWER_SUPPLY_STATUS_CHARGING) {
                 if (!MPSY_PROP(TIME_TO_FULL_AVG, &time_to_full) ||
-                                !MPSY_PROP(TIME_TO_FULL_NOW, &time_to_full)) {
+                                !MPSY_PROP(TIME_TO_FULL_NOW, &time_to_full))
                         info->time = time_to_full.intval / 60;
-                } else {
-                        info->time = calculate_time(status.intval, 0);
-                        if (info->time == -1)
-                                info->time = calculate_time(status.intval, 1);
-                }
+                else
+                        info->time = calculate_time(status.intval);
         } else {
                 if (!MPSY_PROP(TIME_TO_EMPTY_AVG, &time_to_empty) ||
-                              !MPSY_PROP(TIME_TO_EMPTY_NOW, &time_to_empty)) {
+                              !MPSY_PROP(TIME_TO_EMPTY_NOW, &time_to_empty))
                         info->time = time_to_empty.intval / 60;
-                } else {
-                        info->time = calculate_time(status.intval, 0);
-                        if (info->time == -1)
-                                info->time = calculate_time(status.intval, 1);
-                }
+                else
+                        info->time = calculate_time(status.intval);
         }
 
         mutex_unlock(&apm_mutex);