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From: Sascha Hauer <s.hauer@pengutronix.de>
To: linux-pm@vger.kernel.org
Cc: Zhang Rui <rui.zhang@intel.com>,
	Eduardo Valentin <edubezval@gmail.com>,
	linux-kernel@vger.kernel.org,
	Stephen Warren <swarren@wwwdotorg.org>,
	Mikko Perttunen <mikko.perttunen@kapsi.fi>,
	kernel@pengutronix.de, linux-mediatek@lists.infradead.org,
	linux-arm-kernel@lists.infradead.org,
	Brian Norris <computersforpeace@gmail.com>,
	Sascha Hauer <s.hauer@pengutronix.de>
Subject: [PATCH 09/13] thermal: Allow sensor ops to fail with -ENOSYS
Date: Tue, 28 Apr 2015 10:25:59 +0200	[thread overview]
Message-ID: <1430209563-647-10-git-send-email-s.hauer@pengutronix.de> (raw)
In-Reply-To: <1430209563-647-1-git-send-email-s.hauer@pengutronix.de>

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 81ebc24..0f3d26c 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);
 	}
-- 
2.1.4


WARNING: multiple messages have this Message-ID
From: s.hauer@pengutronix.de (Sascha Hauer)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 09/13] thermal: Allow sensor ops to fail with -ENOSYS
Date: Tue, 28 Apr 2015 10:25:59 +0200	[thread overview]
Message-ID: <1430209563-647-10-git-send-email-s.hauer@pengutronix.de> (raw)
In-Reply-To: <1430209563-647-1-git-send-email-s.hauer@pengutronix.de>

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 81ebc24..0f3d26c 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);
 	}
-- 
2.1.4

  parent reply	other threads:[~2015-04-28  8:26 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-04-28  8:25 [PATCH v2] Thermal cleanups and hardware trip points Sascha Hauer
2015-04-28  8:25 ` Sascha Hauer
2015-04-28  8:25 ` [PATCH 01/13] thermal: consistently use int for temperatures Sascha Hauer
2015-04-28  8:25   ` Sascha Hauer
2015-04-28  8:25 ` [PATCH 02/13] thermal: trivial: fix typo in comment Sascha Hauer
2015-04-28  8:25   ` Sascha Hauer
2015-04-28  8:25 ` [PATCH 03/13] thermal: trivial: Add missing whitespace in message Sascha Hauer
2015-04-28  8:25   ` Sascha Hauer
2015-04-28  8:25   ` Sascha Hauer
2015-04-28  8:25 ` [PATCH 04/13] thermal: remove useless call to thermal_zone_device_set_polling Sascha Hauer
2015-04-28  8:25   ` Sascha Hauer
2015-04-28  8:25 ` [PATCH 05/13] thermal: Use IS_ENABLED instead of #ifdef Sascha Hauer
2015-04-28  8:25   ` Sascha Hauer
2015-04-28  8:25 ` [PATCH 06/13] thermal: Add comment explaining test for critical temperature Sascha Hauer
2015-04-28  8:25   ` Sascha Hauer
2015-04-28  8:25 ` [PATCH 07/13] thermal: inline only once used function Sascha Hauer
2015-04-28  8:25   ` Sascha Hauer
2015-04-28  8:25 ` [PATCH 08/13] thermal: streamline get_trend callbacks Sascha Hauer
2015-04-28  8:25   ` Sascha Hauer
2015-04-28  8:25 ` Sascha Hauer [this message]
2015-04-28  8:25   ` [PATCH 09/13] thermal: Allow sensor ops to fail with -ENOSYS Sascha Hauer
2015-04-28  8:26 ` [PATCH 10/13] thermal: of: always set sensor related callbacks Sascha Hauer
2015-04-28  8:26   ` Sascha Hauer
2015-04-28  8:26   ` Sascha Hauer
2015-04-28  8:26 ` [PATCH 11/13] thermal: Make struct thermal_zone_device_ops const Sascha Hauer
2015-04-28  8:26   ` Sascha Hauer
2015-04-28  8:26 ` [PATCH 12/13] thermal: thermal: Add support for hardware-tracked trip points Sascha Hauer
2015-04-28  8:26   ` Sascha Hauer
2015-04-28  8:26 ` [PATCH 13/13] thermal: of: implement .set_trips for device tree thermal zones Sascha Hauer
2015-04-28  8:26   ` Sascha Hauer

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