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authorEduardo Valentin <eduardo.valentin@ti.com>2013-04-05 12:32:29 +0000
committerZhang Rui <rui.zhang@intel.com>2013-04-15 09:39:02 +0800
commit837b26bb2e4a83d224e725f07a1d9ca824bf905c (patch)
tree7dc6a3c904b5a434f0c1fb48daa99e9dbbb704a0 /drivers/thermal
parent63c4d919cf66b1b3ffa7861bddb50a697914af5b (diff)
downloadvexpress-lsk-837b26bb2e4a83d224e725f07a1d9ca824bf905c.tar.gz
thermal: expose thermal_zone_get_temp API
This patch exports the thermal_zone_get_temp API so that driver writers can fetch temperature of thermal zones managed by other drivers. Acked-by: Durgadoss R <durgadoss.r@intel.com> Signed-off-by: Eduardo Valentin <eduardo.valentin@ti.com> Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Diffstat (limited to 'drivers/thermal')
-rw-r--r--drivers/thermal/thermal_core.c20
1 files changed, 17 insertions, 3 deletions
diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
index 5045473485c..c0779adb245 100644
--- a/drivers/thermal/thermal_core.c
+++ b/drivers/thermal/thermal_core.c
@@ -369,16 +369,28 @@ 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);
@@ -402,8 +414,10 @@ 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)
{