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Message-Id: <1336576007-8772-1-git-send-email-jenny.tc@intel.com>
Date: Wed, 9 May 2012 20:36:47 +0530
From: Jenny TC <jenny.tc@...el.com>
To: cbouatmailru@...il.com, anton.vorontsov@...aro.org
Cc: linux-kernel@...r.kernel.org, durgadoss.r@...el.com,
Jenny TC <jenny.tc@...el.com>
Subject: [PATCHv2] power_supply: Register battery as a thermal zone
Battery and charger contribute to Thermals in most of the embedded
devices. So, it makes sense to identify them as Thermal zones in a
particular platform.
This patch registers a thermal zone if the power supply is reporting
a temperature property. The thermal zone will be used by platform's
thermal management solution.
Signed-off-by: Jenny TC <jenny.tc@...el.com>
---
v1
* Made initial code changes
v2
* Removed unnecessary WARN_ON's
* Consolidated all #ifdef CONFIG_THERMAL in one place
drivers/power/power_supply_core.c | 59 +++++++++++++++++++++++++++++++++++++
include/linux/power_supply.h | 3 ++
2 files changed, 62 insertions(+), 0 deletions(-)
diff --git a/drivers/power/power_supply_core.c b/drivers/power/power_supply_core.c
index 6ad6127..8e01432 100644
--- a/drivers/power/power_supply_core.c
+++ b/drivers/power/power_supply_core.c
@@ -17,6 +17,7 @@
#include <linux/device.h>
#include <linux/err.h>
#include <linux/power_supply.h>
+#include <linux/thermal.h>
#include "power_supply.h"
/* exported for the APM Power driver, APM emulation */
@@ -169,6 +170,53 @@ static void power_supply_dev_release(struct device *dev)
kfree(dev);
}
+#ifdef CONFIG_THERMAL
+static int power_supply_read_temp(struct thermal_zone_device *tzd,
+ unsigned long *temp)
+{
+ struct power_supply *psy;
+ union power_supply_propval val;
+ int ret;
+
+ WARN_ON(tzd == NULL);
+ psy = tzd->devdata;
+ ret = psy->get_property(psy,
+ POWER_SUPPLY_PROP_TEMP, &val);
+
+ /* Convert tenths of degree Celsius to milli degree Celsius*/
+ if (!ret)
+ *temp = val.intval * 100;
+
+ return ret;
+}
+
+static struct thermal_zone_device_ops psy_tzd_ops = {
+ .get_temp = power_supply_read_temp,
+};
+
+static int register_thermal(struct power_supply *psy)
+{
+ int i;
+ /* Register battery zone device psy reports temperature */
+ for (i = 0; i < psy->num_properties; i++) {
+ if (psy->properties[i] == POWER_SUPPLY_PROP_TEMP) {
+ psy->tzd = thermal_zone_device_register(
+ (char *)psy->name, 0, psy,
+ &psy_tzd_ops, 0, 0, 0, 0);
+ if (IS_ERR(psy->tzd))
+ return PTR_ERR(psy->tzd);
+ break;
+ }
+ }
+ return 0;
+}
+#else
+static int register_thermal(struct power_supply *psy)
+{
+ return 0;
+}
+#endif
+
int power_supply_register(struct device *parent, struct power_supply *psy)
{
struct device *dev;
@@ -197,6 +245,10 @@ int power_supply_register(struct device *parent, struct power_supply *psy)
if (rc)
goto device_add_failed;
+ rc = register_thermal(psy);
+ if (rc)
+ goto therm_zone_reg_failed;
+
rc = power_supply_create_triggers(psy);
if (rc)
goto create_triggers_failed;
@@ -206,6 +258,9 @@ int power_supply_register(struct device *parent, struct power_supply *psy)
goto success;
create_triggers_failed:
+ if (psy->tzd)
+ thermal_zone_device_unregister(psy->tzd);
+therm_zone_reg_failed:
device_del(dev);
kobject_set_name_failed:
device_add_failed:
@@ -220,6 +275,10 @@ void power_supply_unregister(struct power_supply *psy)
cancel_work_sync(&psy->changed_work);
sysfs_remove_link(&psy->dev->kobj, "powers");
power_supply_remove_triggers(psy);
+#ifdef CONFIG_THERMAL
+ if (psy->tzd)
+ thermal_zone_device_unregister(psy->tzd);
+#endif
device_unregister(psy->dev);
}
EXPORT_SYMBOL_GPL(power_supply_unregister);
diff --git a/include/linux/power_supply.h b/include/linux/power_supply.h
index c38c13d..1f58435 100644
--- a/include/linux/power_supply.h
+++ b/include/linux/power_supply.h
@@ -172,6 +172,9 @@ struct power_supply {
/* private */
struct device *dev;
struct work_struct changed_work;
+#ifdef CONFIG_THERMAL
+ struct thermal_zone_device *tzd;
+#endif
#ifdef CONFIG_LEDS_TRIGGERS
struct led_trigger *charging_full_trig;
--
1.7.1
--
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