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Message-ID: <20ADAB092842284E95860F279283C56425D17E@BGSMSX101.gar.corp.intel.com>
Date: Sun, 10 Jun 2012 04:15:25 +0000
From: "Tc, Jenny" <jenny.tc@...el.com>
To: "cbouatmailru@...il.com" <cbouatmailru@...il.com>,
"anton.vorontsov@...aro.org" <anton.vorontsov@...aro.org>
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
Hi Anton,
Ping..
Could you please review/merge this patch ?
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
--
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