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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@intel.com>
Signed-off-by: Anton Vorontsov <cbouatmailru@gmail.com>
This commit is contained in:
Jenny TC 2012-05-09 20:36:47 +05:30 committed by Anton Vorontsov
parent 7dbae5562e
commit 3be330bf88
2 changed files with 68 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

65
drivers/power/power_supply_core.c
View File

@ -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 +170,63 @@ 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 psy_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(psy->name, 0,
psy, &psy_tzd_ops, 0, 0, 0, 0);
if (IS_ERR(psy->tzd))
return PTR_ERR(psy->tzd);
break;
}
}
return 0;
}
static void psy_unregister_thermal(struct power_supply *psy)
{
if (IS_ERR_OR_NULL(psy->tzd))
return;
thermal_zone_device_unregister(psy->tzd);
}
#else
static int psy_register_thermal(struct power_supply *psy)
{
return 0;
}
static void psy_unregister_thermal(struct power_supply *psy)
{
}
#endif
int power_supply_register(struct device *parent, struct power_supply *psy)
{
struct device *dev;
@ -197,6 +255,10 @@ int power_supply_register(struct device *parent, struct power_supply *psy)
if (rc)
goto device_add_failed;
rc = psy_register_thermal(psy);
if (rc)
goto register_thermal_failed;
rc = power_supply_create_triggers(psy);
if (rc)
goto create_triggers_failed;
@ -206,6 +268,8 @@ int power_supply_register(struct device *parent, struct power_supply *psy)
goto success;
create_triggers_failed:
psy_unregister_thermal(psy);
register_thermal_failed:
device_del(dev);
kobject_set_name_failed:
device_add_failed:
@ -220,6 +284,7 @@ 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);
psy_unregister_thermal(psy);
device_unregister(psy->dev);
}
EXPORT_SYMBOL_GPL(power_supply_unregister);

3
include/linux/power_supply.h
View File

@ -173,6 +173,9 @@ 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;