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-rw-r--r--target/linux/mediatek/patches/0017-thermal-Allow-sensor-ops-to-fail-with-ENOSYS.patch90
1 files changed, 90 insertions, 0 deletions
diff --git a/target/linux/mediatek/patches/0017-thermal-Allow-sensor-ops-to-fail-with-ENOSYS.patch b/target/linux/mediatek/patches/0017-thermal-Allow-sensor-ops-to-fail-with-ENOSYS.patch
new file mode 100644
index 0000000000..f533a88319
--- /dev/null
+++ b/target/linux/mediatek/patches/0017-thermal-Allow-sensor-ops-to-fail-with-ENOSYS.patch
@@ -0,0 +1,90 @@
+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(-)
+
+diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
+index 19da022..3d8f9f9 100644
+--- a/drivers/thermal/thermal_core.c
++++ b/drivers/thermal/thermal_core.c
+@@ -413,13 +413,16 @@ static void handle_thermal_trip(struct thermal_zone_device *tz, int trip)
+ */
+ 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);
+
+@@ -445,7 +448,7 @@ int thermal_zone_get_temp(struct thermal_zone_device *tz, int *temp)
+ }
+
+ mutex_unlock(&tz->lock);
+-exit:
++
+ return ret;
+ }
+ EXPORT_SYMBOL_GPL(thermal_zone_get_temp);
+@@ -454,10 +457,11 @@ void thermal_zone_device_update(struct thermal_zone_device *tz)
+ {
+ int temp, ret, count;
+
+- 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,
+@@ -783,10 +787,16 @@ emul_temp_store(struct device *dev, struct device_attribute *attr,
+ 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);
+ }
+--
+1.7.10.4
+