power_supply: Add a charge_type property, and use it for olpc driver

This adds a new sysfs file called 'charge_type' which displays the
type of charging (unknown, n/a, trickle charge, or fast charging).

This allows things like battery diagnostics to determine what the
battery/EC is doing without resorting to changing the 'status' sysfs
output.

Signed-off-by: Andres Salomon <dilinger@collabora.co.uk>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Anton Vorontsov <cbouatmailru@gmail.com>

diff --git a/Documentation/power/power_supply_class.txt b/Documentation/power/power_supply_class.txt
index 709d955..9f16c51 100644 (file)
--- a/Documentation/power/power_supply_class.txt
+++ b/Documentation/power/power_supply_class.txt
@@ -76,6 +76,11 @@ STATUS - this attribute represents operating status (charging, full,
 discharging (i.e. powering a load), etc.). This corresponds to
 BATTERY_STATUS_* values, as defined in battery.h.
 
+CHARGE_TYPE - batteries can typically charge at different rates.
+This defines trickle and fast charges.  For batteries that
+are already charged or discharging, 'n/a' can be displayed (or
+'unknown', if the status is not known).
+
 HEALTH - represents health of the battery, values corresponds to
 POWER_SUPPLY_HEALTH_*, defined in battery.h.
 

diff --git a/drivers/power/olpc_battery.c b/drivers/power/olpc_battery.c
index 602bbd0..8fefe5a 100644 (file)
--- a/drivers/power/olpc_battery.c
+++ b/drivers/power/olpc_battery.c
@@ -233,6 +233,14 @@ static int olpc_bat_get_property(struct power_supply *psy,
                if (ret)
                        return ret;
                break;
+       case POWER_SUPPLY_PROP_CHARGE_TYPE:
+               if (ec_byte & BAT_STAT_TRICKLE)
+                       val->intval = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
+               else if (ec_byte & BAT_STAT_CHARGING)
+                       val->intval = POWER_SUPPLY_CHARGE_TYPE_FAST;
+               else
+                       val->intval = POWER_SUPPLY_CHARGE_TYPE_NONE;
+               break;
        case POWER_SUPPLY_PROP_PRESENT:
                val->intval = !!(ec_byte & (BAT_STAT_PRESENT |
                                            BAT_STAT_TRICKLE));
@@ -325,6 +333,7 @@ static int olpc_bat_get_property(struct power_supply *psy,
 
 static enum power_supply_property olpc_bat_props[] = {
        POWER_SUPPLY_PROP_STATUS,
+       POWER_SUPPLY_PROP_CHARGE_TYPE,
        POWER_SUPPLY_PROP_PRESENT,
        POWER_SUPPLY_PROP_HEALTH,
        POWER_SUPPLY_PROP_TECHNOLOGY,

diff --git a/drivers/power/power_supply_sysfs.c b/drivers/power/power_supply_sysfs.c
index 9deabbd..0814439 100644 (file)
--- a/drivers/power/power_supply_sysfs.c
+++ b/drivers/power/power_supply_sysfs.c
@@ -43,6 +43,9 @@ static ssize_t power_supply_show_property(struct device *dev,
        static char *status_text[] = {
                "Unknown", "Charging", "Discharging", "Not charging", "Full"
        };
+       static char *charge_type[] = {
+               "Unknown", "N/A", "Trickle", "Fast"
+       };
        static char *health_text[] = {
                "Unknown", "Good", "Overheat", "Dead", "Over voltage",
                "Unspecified failure", "Cold",
@@ -70,6 +73,8 @@ static ssize_t power_supply_show_property(struct device *dev,
 
        if (off == POWER_SUPPLY_PROP_STATUS)
                return sprintf(buf, "%s\n", status_text[value.intval]);
+       else if (off == POWER_SUPPLY_PROP_CHARGE_TYPE)
+               return sprintf(buf, "%s\n", charge_type[value.intval]);
        else if (off == POWER_SUPPLY_PROP_HEALTH)
                return sprintf(buf, "%s\n", health_text[value.intval]);
        else if (off == POWER_SUPPLY_PROP_TECHNOLOGY)
@@ -86,6 +91,7 @@ static ssize_t power_supply_show_property(struct device *dev,
 static struct device_attribute power_supply_attrs[] = {
        /* Properties of type `int' */
        POWER_SUPPLY_ATTR(status),
+       POWER_SUPPLY_ATTR(charge_type),
        POWER_SUPPLY_ATTR(health),
        POWER_SUPPLY_ATTR(present),
        POWER_SUPPLY_ATTR(online),

diff --git a/include/linux/power_supply.h b/include/linux/power_supply.h
index 0ab6aa1..4c7c6fc 100644 (file)
--- a/include/linux/power_supply.h
+++ b/include/linux/power_supply.h
@@ -39,6 +39,13 @@ enum {
 };
 
 enum {
+       POWER_SUPPLY_CHARGE_TYPE_UNKNOWN = 0,
+       POWER_SUPPLY_CHARGE_TYPE_NONE,
+       POWER_SUPPLY_CHARGE_TYPE_TRICKLE,
+       POWER_SUPPLY_CHARGE_TYPE_FAST,
+};
+
+enum {
        POWER_SUPPLY_HEALTH_UNKNOWN = 0,
        POWER_SUPPLY_HEALTH_GOOD,
        POWER_SUPPLY_HEALTH_OVERHEAT,
@@ -70,6 +77,7 @@ enum {
 enum power_supply_property {
        /* Properties of type `int' */
        POWER_SUPPLY_PROP_STATUS = 0,
+       POWER_SUPPLY_PROP_CHARGE_TYPE,
        POWER_SUPPLY_PROP_HEALTH,
        POWER_SUPPLY_PROP_PRESENT,
        POWER_SUPPLY_PROP_ONLINE,