diff options
Diffstat (limited to 'target/linux/mediatek/patches/0017-thermal-Allow-sensor-ops-to-fail-with-ENOSYS.patch')
| -rw-r--r-- | target/linux/mediatek/patches/0017-thermal-Allow-sensor-ops-to-fail-with-ENOSYS.patch | 90 |
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 + |