Revert "power: remove POWER_SUPPLY_PROP_CAPACITY_LEVEL"

This reverts commit 8efe444038a205e79b38b7ad03878824901849a8 and
4cbc76eadf56399cd11fb736b33c53aec9caab8c.

Richard@laptop.org was apparently using CAPACITY_LEVEL for debugging
battery/EC problems, and was upset that it was removed.  This readds it.

Conflicts:

	Documentation/power_supply_class.txt

Signed-off-by: Andres Salomon <dilinger@collabora.co.uk>
Signed-off-by: Anton Vorontsov <cbouatmailru@gmail.com>

2 files changed, 15 insertions, 0 deletions

diff --git a/drivers/power/olpc_battery.c b/drivers/power/olpc_battery.c
index 58e419299cd6..3a589df09376 100644
--- a/drivers/power/olpc_battery.c
+++ b/drivers/power/olpc_battery.c
@@ -276,6 +276,14 @@ static int olpc_bat_get_property(struct power_supply *psy,
                         return ret;
                 val->intval = ec_byte;
                 break;
+        case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
+                if (ec_byte & BAT_STAT_FULL)
+                        val->intval = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
+                else if (ec_byte & BAT_STAT_LOW)
+                        val->intval = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
+                else
+                        val->intval = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
+                break;
         case POWER_SUPPLY_PROP_TEMP:
                 ret = olpc_ec_cmd(EC_BAT_TEMP, NULL, 0, (void *)&ec_word, 2);
                 if (ret)
@@ -321,6 +329,7 @@ static enum power_supply_property olpc_bat_props[] = {
         POWER_SUPPLY_PROP_VOLTAGE_AVG,
         POWER_SUPPLY_PROP_CURRENT_AVG,
         POWER_SUPPLY_PROP_CAPACITY,
+        POWER_SUPPLY_PROP_CAPACITY_LEVEL,
         POWER_SUPPLY_PROP_TEMP,
         POWER_SUPPLY_PROP_TEMP_AMBIENT,
         POWER_SUPPLY_PROP_MANUFACTURER,
diff --git a/drivers/power/power_supply_sysfs.c b/drivers/power/power_supply_sysfs.c
index da73591017f9..9deabbde6fd6 100644
--- a/drivers/power/power_supply_sysfs.c
+++ b/drivers/power/power_supply_sysfs.c
@@ -51,6 +51,9 @@ static ssize_t power_supply_show_property(struct device *dev,
                 "Unknown", "NiMH", "Li-ion", "Li-poly", "LiFe", "NiCd",
                 "LiMn"
         };
+        static char *capacity_level_text[] = {
+                "Unknown", "Critical", "Low", "Normal", "High", "Full"
+        };
         ssize_t ret;
         struct power_supply *psy = dev_get_drvdata(dev);
         const ptrdiff_t off = attr - power_supply_attrs;
@@ -71,6 +74,8 @@ static ssize_t power_supply_show_property(struct device *dev,
                 return sprintf(buf, "%s\n", health_text[value.intval]);
         else if (off == POWER_SUPPLY_PROP_TECHNOLOGY)
                 return sprintf(buf, "%s\n", technology_text[value.intval]);
+        else if (off == POWER_SUPPLY_PROP_CAPACITY_LEVEL)
+                return sprintf(buf, "%s\n", capacity_level_text[value.intval]);
         else if (off >= POWER_SUPPLY_PROP_MODEL_NAME)
                 return sprintf(buf, "%s\n", value.strval);
 
@@ -109,6 +114,7 @@ static struct device_attribute power_supply_attrs[] = {
         POWER_SUPPLY_ATTR(energy_now),
         POWER_SUPPLY_ATTR(energy_avg),
         POWER_SUPPLY_ATTR(capacity),
+        POWER_SUPPLY_ATTR(capacity_level),
         POWER_SUPPLY_ATTR(temp),
         POWER_SUPPLY_ATTR(temp_ambient),
         POWER_SUPPLY_ATTR(time_to_empty_now),