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>
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@ -17,6 +17,7 @@
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/power_supply.h>
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#include <linux/thermal.h>
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#include "power_supply.h"
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/* exported for the APM Power driver, APM emulation */
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@ -169,6 +170,63 @@ static void power_supply_dev_release(struct device *dev)
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kfree(dev);
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}
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#ifdef CONFIG_THERMAL
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static int power_supply_read_temp(struct thermal_zone_device *tzd,
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unsigned long *temp)
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{
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struct power_supply *psy;
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union power_supply_propval val;
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int ret;
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WARN_ON(tzd == NULL);
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psy = tzd->devdata;
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ret = psy->get_property(psy, POWER_SUPPLY_PROP_TEMP, &val);
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/* Convert tenths of degree Celsius to milli degree Celsius. */
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if (!ret)
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*temp = val.intval * 100;
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return ret;
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}
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static struct thermal_zone_device_ops psy_tzd_ops = {
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.get_temp = power_supply_read_temp,
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};
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static int psy_register_thermal(struct power_supply *psy)
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{
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int i;
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/* Register battery zone device psy reports temperature */
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for (i = 0; i < psy->num_properties; i++) {
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if (psy->properties[i] == POWER_SUPPLY_PROP_TEMP) {
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psy->tzd = thermal_zone_device_register(psy->name, 0,
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psy, &psy_tzd_ops, 0, 0, 0, 0);
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if (IS_ERR(psy->tzd))
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return PTR_ERR(psy->tzd);
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break;
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}
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}
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return 0;
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}
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static void psy_unregister_thermal(struct power_supply *psy)
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{
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if (IS_ERR_OR_NULL(psy->tzd))
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return;
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thermal_zone_device_unregister(psy->tzd);
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}
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#else
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static int psy_register_thermal(struct power_supply *psy)
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{
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return 0;
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}
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static void psy_unregister_thermal(struct power_supply *psy)
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{
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}
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#endif
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int power_supply_register(struct device *parent, struct power_supply *psy)
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{
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struct device *dev;
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@ -197,6 +255,10 @@ int power_supply_register(struct device *parent, struct power_supply *psy)
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if (rc)
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goto device_add_failed;
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rc = psy_register_thermal(psy);
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if (rc)
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goto register_thermal_failed;
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rc = power_supply_create_triggers(psy);
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if (rc)
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goto create_triggers_failed;
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@ -206,6 +268,8 @@ int power_supply_register(struct device *parent, struct power_supply *psy)
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goto success;
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create_triggers_failed:
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psy_unregister_thermal(psy);
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register_thermal_failed:
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device_del(dev);
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kobject_set_name_failed:
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device_add_failed:
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@ -220,6 +284,7 @@ void power_supply_unregister(struct power_supply *psy)
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cancel_work_sync(&psy->changed_work);
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sysfs_remove_link(&psy->dev->kobj, "powers");
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power_supply_remove_triggers(psy);
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psy_unregister_thermal(psy);
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device_unregister(psy->dev);
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}
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EXPORT_SYMBOL_GPL(power_supply_unregister);
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@ -173,6 +173,9 @@ struct power_supply {
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/* private */
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struct device *dev;
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struct work_struct changed_work;
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#ifdef CONFIG_THERMAL
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struct thermal_zone_device *tzd;
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#endif
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#ifdef CONFIG_LEDS_TRIGGERS
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struct led_trigger *charging_full_trig;
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