From a2ebfe2fc6e088a70d06cd15a5bc9bcb621cc195 Mon Sep 17 00:00:00 2001
From: Ramakrishna Pallala <ramakrishna.pallala@intel.com>
Date: Tue, 10 Apr 2012 16:21:20 +0530
Subject: [PATCH] power_supply: Add voltage_ocv property and use it for
max17042 driver
This adds a new sysfs file called 'voltage_ocv' which gives the
Open Circuit Voltage of the battery.
This property can be used for platform shutdown policies and
can be useful for initial capacity estimations.
Note: This patch is generated against linux-next branch.
Signed-off-by: Ramakrishna Pallala <ramakrishna.pallala@intel.com>
Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>
---
Documentation/power/power_supply_class.txt | 2 ++
drivers/power/max17042_battery.c | 8 ++++++++
drivers/power/power_supply_sysfs.c | 1 +
include/linux/power_supply.h | 2 ++
4 files changed, 13 insertions(+)
diff --git a/Documentation/power/power_supply_class.txt b/Documentation/power/power_supply_class.txt
index 9f16c5178b662..211831d4095fe 100644
--- a/Documentation/power/power_supply_class.txt
+++ b/Documentation/power/power_supply_class.txt
@@ -84,6 +84,8 @@ are already charged or discharging, 'n/a' can be displayed (or
HEALTH - represents health of the battery, values corresponds to
POWER_SUPPLY_HEALTH_*, defined in battery.h.
+VOLTAGE_OCV - open circuit voltage of the battery.
+
VOLTAGE_MAX_DESIGN, VOLTAGE_MIN_DESIGN - design values for maximal and
minimal power supply voltages. Maximal/minimal means values of voltages
when battery considered "full"/"empty" at normal conditions. Yes, there is
diff --git a/drivers/power/max17042_battery.c b/drivers/power/max17042_battery.c
index 738648d1d9fcb..42c4be9a664ba 100644
--- a/drivers/power/max17042_battery.c
+++ b/drivers/power/max17042_battery.c
@@ -106,6 +106,7 @@ static enum power_supply_property max17042_battery_props[] = {
POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
POWER_SUPPLY_PROP_VOLTAGE_NOW,
POWER_SUPPLY_PROP_VOLTAGE_AVG,
+ POWER_SUPPLY_PROP_VOLTAGE_OCV,
POWER_SUPPLY_PROP_CAPACITY,
POWER_SUPPLY_PROP_CHARGE_FULL,
POWER_SUPPLY_PROP_TEMP,
@@ -170,6 +171,13 @@ static int max17042_get_property(struct power_supply *psy,
if (ret < 0)
return ret;
+ val->intval = ret * 625 / 8;
+ break;
+ case POWER_SUPPLY_PROP_VOLTAGE_OCV:
+ ret = max17042_read_reg(chip->client, MAX17042_OCVInternal);
+ if (ret < 0)
+ return ret;
+
val->intval = ret * 625 / 8;
break;
case POWER_SUPPLY_PROP_CAPACITY:
diff --git a/drivers/power/power_supply_sysfs.c b/drivers/power/power_supply_sysfs.c
index 4368e7d61316b..4150747f9186f 100644
--- a/drivers/power/power_supply_sysfs.c
+++ b/drivers/power/power_supply_sysfs.c
@@ -146,6 +146,7 @@ static struct device_attribute power_supply_attrs[] = {
POWER_SUPPLY_ATTR(voltage_min_design),
POWER_SUPPLY_ATTR(voltage_now),
POWER_SUPPLY_ATTR(voltage_avg),
+ POWER_SUPPLY_ATTR(voltage_ocv),
POWER_SUPPLY_ATTR(current_max),
POWER_SUPPLY_ATTR(current_now),
POWER_SUPPLY_ATTR(current_avg),
diff --git a/include/linux/power_supply.h b/include/linux/power_supply.h
index c38c13db8832e..fd17ae0f9c20b 100644
--- a/include/linux/power_supply.h
+++ b/include/linux/power_supply.h
@@ -96,6 +96,7 @@ enum power_supply_property {
POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
POWER_SUPPLY_PROP_VOLTAGE_NOW,
POWER_SUPPLY_PROP_VOLTAGE_AVG,
+ POWER_SUPPLY_PROP_VOLTAGE_OCV,
POWER_SUPPLY_PROP_CURRENT_MAX,
POWER_SUPPLY_PROP_CURRENT_NOW,
POWER_SUPPLY_PROP_CURRENT_AVG,
@@ -261,6 +262,7 @@ static inline bool power_supply_is_watt_property(enum power_supply_property psp)
case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
case POWER_SUPPLY_PROP_VOLTAGE_AVG:
+ case POWER_SUPPLY_PROP_VOLTAGE_OCV:
case POWER_SUPPLY_PROP_POWER_NOW:
return 1;
default:
--
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