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From 5b622cb2d6ff44b1fb0750beee61f93f2c00548a Mon Sep 17 00:00:00 2001
From: Sascha Hauer <s.hauer@pengutronix.de>
Date: Wed, 13 May 2015 10:52:36 +0200
Subject: [PATCH 17/76] thermal: Allow sensor ops to fail with -ENOSYS
The thermal core uses the existence of the .get_temp, .get_trend and
.set_emul_temp to detect whether this operation exists and should be
used or whether it should be emulated in software. This makes problems
for of-thermal which has to modify the struct thermal_zone_device_ops
during runtime whenever a sensor is registered or unregistered.
Let the core test for -ENOSYS from these callbacks and treat it like
if the callbacks were not present.
This allows of-thermal to always set the sensor related callbacks and
to make struct thermal_zone_device_ops const again.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
drivers/thermal/thermal_core.c | 24 +++++++++++++++++-------
1 file changed, 17 insertions(+), 7 deletions(-)
--- a/drivers/thermal/thermal_core.c
+++ b/drivers/thermal/thermal_core.c
@@ -416,13 +416,16 @@ static void handle_thermal_trip(struct t
*/
int thermal_zone_get_temp(struct thermal_zone_device *tz, int *temp)
{
- int ret = -EINVAL;
+ int ret;
int count;
int crit_temp = INT_MAX;
enum thermal_trip_type type;
- if (!tz || IS_ERR(tz) || !tz->ops->get_temp)
- goto exit;
+ if (!tz || IS_ERR(tz))
+ return -EINVAL;
+
+ if (!tz->ops->get_temp)
+ return -ENOSYS;
mutex_lock(&tz->lock);
@@ -448,7 +451,7 @@ int thermal_zone_get_temp(struct thermal
}
mutex_unlock(&tz->lock);
-exit:
+
return ret;
}
EXPORT_SYMBOL_GPL(thermal_zone_get_temp);
@@ -460,10 +463,11 @@ void thermal_zone_device_update(struct t
if (atomic_read(&in_suspend))
return;
- if (!tz->ops->get_temp)
+ ret = thermal_zone_get_temp(tz, &temp);
+
+ if (ret == -ENOSYS)
return;
- ret = thermal_zone_get_temp(tz, &temp);
if (ret) {
if (ret != -EAGAIN)
dev_warn(&tz->device,
@@ -803,10 +807,16 @@ emul_temp_store(struct device *dev, stru
if (kstrtoul(buf, 10, &temperature))
return -EINVAL;
- if (!tz->ops->set_emul_temp) {
+ if (tz->ops->set_emul_temp)
+ ret = tz->ops->set_emul_temp(tz, temperature);
+ else
+ ret = -ENOSYS;
+
+ if (ret == -ENOSYS) {
mutex_lock(&tz->lock);
tz->emul_temperature = temperature;
mutex_unlock(&tz->lock);
+ ret = 0;
} else {
ret = tz->ops->set_emul_temp(tz, temperature);
}
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