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Date: Mon, 11 Jun 2012 17:56:23 -0700
From: Anton Vorontsov <cbouatmailru@...il.com>
To: "Tc, Jenny" <jenny.tc@...el.com>
Cc: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"R, Durgadoss" <durgadoss.r@...el.com>
Subject: Re: [PATCHv2] power_supply: Register battery as a thermal zone
On Sun, Jun 10, 2012 at 04:15:25AM +0000, Tc, Jenny wrote:
> Hi Anton,
>
> Ping..
> Could you please review/merge this patch ?
Overall, the feature looks great. I'll have a second look at it
today and I hope to apply it, thank you!
> Thanks,
> -jtc
>
> > -----Original Message-----
> > From: Tc, Jenny
> > Sent: Wednesday, May 09, 2012 8:37 PM
> > To: cbouatmailru@...il.com; anton.vorontsov@...aro.org
> > Cc: linux-kernel@...r.kernel.org; R, Durgadoss; Tc, Jenny
> > 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
>
--
Anton Vorontsov
Email: cbouatmailru@...il.com
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