Messages in this thread Patch in this message | | | From | Eduardo Valentin <> | Subject | [PATCHv2 2/3] thermal: expose thermal_zone_get_temp API | Date | Wed, 3 Apr 2013 18:13:16 -0400 |
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This patch exports the thermal_zone_get_temp API so that driver writers can fetch temperature of thermal zones managed by other drivers.
Signed-off-by: Eduardo Valentin <eduardo.valentin@ti.com> --- drivers/thermal/thermal_sys.c | 20 +++++++++++++++++--- include/linux/thermal.h | 1 + 2 files changed, 18 insertions(+), 3 deletions(-)
diff --git a/drivers/thermal/thermal_sys.c b/drivers/thermal/thermal_sys.c index 6e1da0a..e8afb7f 100644 --- a/drivers/thermal/thermal_sys.c +++ b/drivers/thermal/thermal_sys.c @@ -371,16 +371,28 @@ static void handle_thermal_trip(struct thermal_zone_device *tz, int trip) monitor_thermal_zone(tz); } -static int thermal_zone_get_temp(struct thermal_zone_device *tz, - unsigned long *temp) +/** + * thermal_zone_get_temp() - returns its the temperature of thermal zone + * @tz: a valid pointer to a struct thermal_zone_device + * @temp: a valid pointer to where to store the resulting temperature. + * + * When a valid thermal zone reference is passed, it will fetch its + * temperature and fill @temp. + * + * Return: On success returns 0, an error code otherwise + */ +int thermal_zone_get_temp(struct thermal_zone_device *tz, unsigned long *temp) { - int ret = 0; + int ret = -EINVAL; #ifdef CONFIG_THERMAL_EMULATION int count; unsigned long crit_temp = -1UL; enum thermal_trip_type type; #endif + if (IS_ERR_OR_NULL(tz)) + goto exit; + mutex_lock(&tz->lock); ret = tz->ops->get_temp(tz, temp); @@ -404,8 +416,10 @@ static int thermal_zone_get_temp(struct thermal_zone_device *tz, skip_emul: #endif mutex_unlock(&tz->lock); +exit: return ret; } +EXPORT_SYMBOL_GPL(thermal_zone_get_temp); static void update_temperature(struct thermal_zone_device *tz) { diff --git a/include/linux/thermal.h b/include/linux/thermal.h index 0cf9eb5..8eea86c 100644 --- a/include/linux/thermal.h +++ b/include/linux/thermal.h @@ -238,6 +238,7 @@ struct thermal_cooling_device *thermal_cooling_device_register(char *, void *, const struct thermal_cooling_device_ops *); void thermal_cooling_device_unregister(struct thermal_cooling_device *); struct thermal_zone_device *thermal_zone_get_zone_by_name(const char *name); +int thermal_zone_get_temp(struct thermal_zone_device *tz, unsigned long *temp); int thermal_zone_trend_get(struct thermal_zone_device *, int); struct thermal_instance *thermal_instance_get(struct thermal_zone_device *, -- 1.7.7.1.488.ge8e1c
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