linux-kernel - [PATCH] thermal: show supported policies

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Date:	Tue, 16 Sep 2014 16:27:42 +0530
From:	Sanjay Singh Rawat <sanjay.rawat@...aro.org>
To:	rui.zhang@...el.com, edubezval@...il.com
Cc:	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
	linaro-kernel@...ts.linaro.org,
	Sanjay Singh Rawat <sanjay.rawat@...aro.org>
Subject: [PATCH] thermal: show supported policies

With knowledge of supported thermal policies from this attribute, it helps in
setting the policy without failure from the available ones.

Signed-off-by: Sanjay Singh Rawat <sanjay.rawat@...aro.org>
---
 drivers/thermal/thermal_core.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
index 71b0ec0..6caefcd 100644
--- a/drivers/thermal/thermal_core.c
+++ b/drivers/thermal/thermal_core.c
@@ -772,6 +772,25 @@ policy_show(struct device *dev, struct device_attribute *devattr, char *buf)
 	return sprintf(buf, "%s\n", tz->governor->name);
 }
 
+static ssize_t
+available_policy_show(struct device *dev, struct device_attribute *devattr,
+			char *buf)
+{
+	ssize_t i = 0;
+	struct thermal_governor *temp;
+	struct thermal_zone_device *tz = to_thermal_zone(dev);
+
+	mutex_lock(&tz->lock);
+
+	list_for_each_entry(temp, &thermal_governor_list, governor_list)
+		i += sprintf(&buf[i], "%s ", temp->name);
+
+	mutex_unlock(&tz->lock);
+	i += sprintf(&buf[i], "\n");
+
+	return i;
+}
+
 #ifdef CONFIG_THERMAL_EMULATION
 static ssize_t
 emul_temp_store(struct device *dev, struct device_attribute *attr,
@@ -805,6 +824,7 @@ static DEVICE_ATTR(temp, 0444, temp_show, NULL);
 static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
 static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, passive_store);
 static DEVICE_ATTR(policy, S_IRUGO | S_IWUSR, policy_show, policy_store);
+static DEVICE_ATTR(available_policy, S_IRUGO, available_policy_show, NULL);
 
 /* sys I/F for cooling device */
 #define to_cooling_device(_dev)	\
@@ -1538,6 +1558,10 @@ struct thermal_zone_device *thermal_zone_device_register(const char *type,
 	if (result)
 		goto unregister;
 
+	result = device_create_file(&tz->device, &dev_attr_available_policy);
+	if (result)
+		goto unregister;
+
 	/* Update 'this' zone's governor information */
 	mutex_lock(&thermal_governor_lock);
 
-- 
1.8.3.2

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