4 files changed, 16 insertions, 1 deletions

diff --git a/Documentation/power/power_supply_class.txt b/Documentation/power/power_supply_class.txt
index a8686e5a6857..c6cd4956047c 100644
--- a/Documentation/power/power_supply_class.txt
+++ b/Documentation/power/power_supply_class.txt
@@ -101,6 +101,10 @@ of charge when battery became full/empty". It also could mean "value of
 charge when battery considered full/empty at given conditions (temperature,
 age)". I.e. these attributes represents real thresholds, not design values.
 
+CHARGE_COUNTER - the current charge counter (in µAh).  This could easily
+be negative; there is no empty or full value.  It is only useful for
+relative, time-based measurements.
+
 ENERGY_FULL, ENERGY_EMPTY - same as above but for energy.
 
 CAPACITY - capacity in percents.
diff --git a/drivers/power/olpc_battery.c b/drivers/power/olpc_battery.c
index c8b596a7fc94..9dd1589733c2 100644
--- a/drivers/power/olpc_battery.c
+++ b/drivers/power/olpc_battery.c
@@ -19,7 +19,7 @@
 
 #define EC_BAT_VOLTAGE  0x10    /* uint16_t,    *9.76/32,    mV   */
 #define EC_BAT_CURRENT  0x11    /* int16_t,     *15.625/120, mA   */
-#define EC_BAT_ACR      0x12
+#define EC_BAT_ACR      0x12    /* int16_t,     *416.7,      µAh  */
 #define EC_BAT_TEMP     0x13    /* uint16_t,    *100/256,   °C  */
 #define EC_AMB_TEMP     0x14    /* uint16_t,    *100/256,   °C  */
 #define EC_BAT_STATUS   0x15    /* uint8_t,     bitmask */
@@ -289,6 +289,14 @@ static int olpc_bat_get_property(struct power_supply *psy,
                 ec_word = be16_to_cpu(ec_word);
                 val->intval = ec_word * 100 / 256;
                 break;
+        case POWER_SUPPLY_PROP_CHARGE_COUNTER:
+                ret = olpc_ec_cmd(EC_BAT_ACR, NULL, 0, (void *)&ec_word, 2);
+                if (ret)
+                        return ret;
+
+                ec_word = be16_to_cpu(ec_word);
+                val->intval = ec_word * 4167 / 10;
+                break;
         case POWER_SUPPLY_PROP_SERIAL_NUMBER:
                 ret = olpc_ec_cmd(EC_BAT_SERIAL, NULL, 0, (void *)&ser_buf, 8);
                 if (ret)
@@ -317,6 +325,7 @@ static enum power_supply_property olpc_bat_props[] = {
         POWER_SUPPLY_PROP_TEMP_AMBIENT,
         POWER_SUPPLY_PROP_MANUFACTURER,
         POWER_SUPPLY_PROP_SERIAL_NUMBER,
+        POWER_SUPPLY_PROP_CHARGE_COUNTER,
 };
 
 /* EEPROM reading goes completely around the power_supply API, sadly */
diff --git a/drivers/power/power_supply_sysfs.c b/drivers/power/power_supply_sysfs.c
index c444d6b10c58..82e1246eeb0a 100644
--- a/drivers/power/power_supply_sysfs.c
+++ b/drivers/power/power_supply_sysfs.c
@@ -99,6 +99,7 @@ static struct device_attribute power_supply_attrs[] = {
         POWER_SUPPLY_ATTR(charge_empty),
         POWER_SUPPLY_ATTR(charge_now),
         POWER_SUPPLY_ATTR(charge_avg),
+        POWER_SUPPLY_ATTR(charge_counter),
         POWER_SUPPLY_ATTR(energy_full_design),
         POWER_SUPPLY_ATTR(energy_empty_design),
         POWER_SUPPLY_ATTR(energy_full),
diff --git a/include/linux/power_supply.h b/include/linux/power_supply.h
index 68ed19ccf1f7..ea96ead1d39d 100644
--- a/include/linux/power_supply.h
+++ b/include/linux/power_supply.h
@@ -78,6 +78,7 @@ enum power_supply_property {
         POWER_SUPPLY_PROP_CHARGE_EMPTY,
         POWER_SUPPLY_PROP_CHARGE_NOW,
         POWER_SUPPLY_PROP_CHARGE_AVG,
+        POWER_SUPPLY_PROP_CHARGE_COUNTER,
         POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
         POWER_SUPPLY_PROP_ENERGY_EMPTY_DESIGN,
         POWER_SUPPLY_PROP_ENERGY_FULL,