[PATCH 5/8] Thermal: Create Thermal map sysfs attributes for a zone

[Durgadoss R]

This patch creates a thermal map sysfs node under
/sys/class/thermal/zoneX/. This contains
entries named mapY_trip_type, mapY_sensor_name,
mapY_cdev_name, mapY_trip_mask, mapY_weights.

Signed-off-by: Durgadoss R <durgadoss.r@xxxxxxxxx>
---
 drivers/thermal/thermal_sys.c |  221 ++++++++++++++++++++++++++++++++++++++++-
 include/linux/thermal.h       |   25 +++++
 2 files changed, 244 insertions(+), 2 deletions(-)

diff --git a/drivers/thermal/thermal_sys.c b/drivers/thermal/thermal_sys.c
index 69a60a4..e284b67 100644
--- a/drivers/thermal/thermal_sys.c
+++ b/drivers/thermal/thermal_sys.c
@@ -525,6 +525,44 @@ static void remove_cdev_from_zone(struct thermal_zone *tz,
 	tz->cdev_indx--;
 }
 
+static inline void __remove_map_entry(struct thermal_zone *tz, int indx)
+{
+	int i;
+	struct thermal_map_attr *attr = tz->map_attr[indx];
+
+	for (i = 0; i < NUM_MAP_ATTRS; i++)
+		device_remove_file(&tz->device, &attr->attrs[i].attr);
+
+	kfree(tz->map_attr[indx]);
+	tz->map[indx] = NULL;
+}
+
+static void remove_sensor_map_entry(struct thermal_zone *tz,
+				struct thermal_sensor *ts)
+{
+	int i;
+
+	for (i = 0; i < MAX_MAPS_PER_ZONE; i++) {
+		if (tz->map[i] && !strnicmp(ts->name, tz->map[i]->sensor_name,
+						THERMAL_NAME_LENGTH)) {
+			__remove_map_entry(tz, i);
+		}
+	}
+}
+
+static void remove_cdev_map_entry(struct thermal_zone *tz,
+				struct thermal_cooling_device *cdev)
+{
+	int i;
+
+	for (i = 0; i < MAX_MAPS_PER_ZONE; i++) {
+		if (tz->map[i] && !strnicmp(cdev->type, tz->map[i]->cdev_name,
+						THERMAL_NAME_LENGTH)) {
+			__remove_map_entry(tz, i);
+		}
+	}
+}
+
 /* sys I/F for thermal zone */
 
 #define to_thermal_zone(_dev) \
@@ -917,6 +955,107 @@ policy_show(struct device *dev, struct device_attribute *devattr, char *buf)
 }
 
 static ssize_t
+map_ttype_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	char *trip;
+	int indx;
+	struct thermal_zone *tz = to_zone(dev);
+
+	if (!sscanf(attr->attr.name, "map%d_trip_type", &indx))
+		return -EINVAL;
+
+	if (indx < 0 || indx >= MAX_MAPS_PER_ZONE)
+		return -EINVAL;
+
+	if (!tz->map[indx])
+		return sprintf(buf, "<Unavailable>\n");
+
+	trip = (tz->map[indx]->trip_type == THERMAL_TRIP_ACTIVE) ?
+						"active" : "passive";
+	return sprintf(buf, "%s\n", trip);
+}
+
+static ssize_t map_ts_name_show(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	int indx;
+	struct thermal_zone *tz = to_zone(dev);
+
+	if (!sscanf(attr->attr.name, "map%d_sensor_name", &indx))
+		return -EINVAL;
+
+	if (indx < 0 || indx >= MAX_MAPS_PER_ZONE)
+		return -EINVAL;
+
+	if (!tz->map[indx])
+		return sprintf(buf, "<Unavailable>\n");
+
+	return sprintf(buf, "%s\n", tz->map[indx]->sensor_name);
+}
+
+static ssize_t map_cdev_name_show(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	int indx;
+	struct thermal_zone *tz = to_zone(dev);
+
+	if (!sscanf(attr->attr.name, "map%d_cdev_name", &indx))
+		return -EINVAL;
+
+	if (indx < 0 || indx >= MAX_MAPS_PER_ZONE)
+		return -EINVAL;
+
+	if (!tz->map[indx])
+		return sprintf(buf, "<Unavailable>\n");
+
+	return sprintf(buf, "%s\n", tz->map[indx]->cdev_name);
+}
+
+static ssize_t map_trip_mask_show(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	int indx;
+	struct thermal_zone *tz = to_zone(dev);
+
+	if (!sscanf(attr->attr.name, "map%d_trip_mask", &indx))
+		return -EINVAL;
+
+	if (indx < 0 || indx >= MAX_MAPS_PER_ZONE)
+		return -EINVAL;
+
+	if (!tz->map[indx])
+		return sprintf(buf, "<Unavailable>\n");
+
+	return sprintf(buf, "0x%x\n", tz->map[indx]->trip_mask);
+}
+
+static ssize_t map_weights_show(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	int i, indx, ret = 0;
+	struct thermal_map *map;
+	struct thermal_zone *tz = to_zone(dev);
+
+	if (!sscanf(attr->attr.name, "map%d_weights", &indx))
+		return -EINVAL;
+
+	if (indx < 0 || indx >= MAX_MAPS_PER_ZONE)
+		return -EINVAL;
+
+	if (!tz->map[indx])
+		return sprintf(buf, "<Unavailable>\n");
+
+	map = tz->map[indx];
+
+	ret += sprintf(buf, "%d", map->weights[0]);
+	for (i = 1; i < map->num_weights; i++)
+		ret += sprintf(buf + ret, " %d", map->weights[i]);
+
+	ret += sprintf(buf + ret, "\n");
+	return ret;
+}
+
+static ssize_t
 active_show(struct device *dev, struct device_attribute *attr, char *buf)
 {
 	int i, indx, ret = 0;
@@ -1655,8 +1794,10 @@ void thermal_cooling_device_unregister(struct thermal_cooling_device *cdev)
 
 	mutex_lock(&zone_list_lock);
 
-	for_each_thermal_zone(tmp_tz)
+	for_each_thermal_zone(tmp_tz) {
 		remove_cdev_from_zone(tmp_tz, cdev);
+		remove_cdev_map_entry(tmp_tz, cdev);
+	}
 
 	mutex_unlock(&zone_list_lock);
 
@@ -1994,6 +2135,9 @@ void remove_thermal_zone(struct thermal_zone *tz)
 				kobject_name(&tz->cdevs[i]->device.kobj));
 	}
 
+	for (i = 0; i < MAX_MAPS_PER_ZONE; i++)
+		__remove_map_entry(tz, i);
+
 	release_idr(&thermal_zone_idr, &thermal_idr_lock, tz->id);
 	idr_destroy(&tz->idr);
 
@@ -2039,6 +2183,77 @@ struct thermal_sensor *get_sensor_by_name(const char *name)
 }
 EXPORT_SYMBOL(get_sensor_by_name);
 
+static int create_map_attrs(struct thermal_zone *tz, int indx)
+{
+	int ret, i;
+	struct thermal_map_attr *attr = tz->map_attr[indx];
+
+	static const char *const names[NUM_MAP_ATTRS] = { "map%d_trip_type",
+			"map%d_sensor_name", "map%d_cdev_name",
+			"map%d_trip_mask", "map%d_weights" };
+	static ssize_t (*const rd_ptr[NUM_MAP_ATTRS]) (struct device *dev,
+			struct device_attribute *devattr, char *buf) = {
+			map_ttype_show, map_ts_name_show, map_cdev_name_show,
+			map_trip_mask_show, map_weights_show };
+
+	for (i = 0; i < NUM_MAP_ATTRS; i++) {
+		snprintf(attr->attrs[i].name,
+			THERMAL_NAME_LENGTH, names[i], indx);
+		attr->attrs[i].attr.attr.name = attr->attrs[i].name;
+		attr->attrs[i].attr.attr.mode = S_IRUGO;
+		attr->attrs[i].attr.show = rd_ptr[i];
+		sysfs_attr_init(&attr->attrs[i].attr);
+
+		ret = device_create_file(&tz->device, &attr->attrs[i].attr);
+		if (ret)
+			goto exit_free;
+	}
+	return 0;
+exit_free:
+	while (--i >= 0)
+		device_remove_file(&tz->device, &attr->attrs[i].attr);
+	return ret;
+}
+
+int add_map_entry(struct thermal_zone *tz, struct thermal_map *map)
+{
+	int ret, indx;
+
+	if (!tz || !map)
+		return -EINVAL;
+
+	mutex_lock(&zone_list_lock);
+
+	for (indx = 0; indx < MAX_MAPS_PER_ZONE; indx++) {
+		if (tz->map[indx] == NULL)
+			break;
+	}
+
+	if (indx >= MAX_MAPS_PER_ZONE) {
+		ret = -EINVAL;
+		goto exit;
+	}
+
+	tz->map_attr[indx] = kzalloc(sizeof(struct thermal_map_attr),
+						GFP_KERNEL);
+	if (!tz->map_attr[indx]) {
+		ret = -ENOMEM;
+		goto exit;
+	}
+
+	ret = create_map_attrs(tz, indx);
+	if (ret) {
+		kfree(tz->map_attr[indx]);
+		goto exit;
+	}
+
+	tz->map[indx] = map;
+exit:
+	mutex_unlock(&zone_list_lock);
+	return ret;
+}
+EXPORT_SYMBOL(add_map_entry);
+
 int add_sensor_to_zone(struct thermal_zone *tz, struct thermal_sensor *ts)
 {
 	int ret;
@@ -2243,8 +2458,10 @@ void thermal_sensor_unregister(struct thermal_sensor *ts)
 
 	mutex_lock(&zone_list_lock);
 
-	for_each_thermal_zone(tz)
+	for_each_thermal_zone(tz) {
 		remove_sensor_from_zone(tz, ts);
+		remove_sensor_map_entry(tz, ts);
+	}
 
 	mutex_unlock(&zone_list_lock);
 
diff --git a/include/linux/thermal.h b/include/linux/thermal.h
index 2f68018..4389599 100644
--- a/include/linux/thermal.h
+++ b/include/linux/thermal.h
@@ -60,6 +60,11 @@
 
 #define MAX_CDEVS_PER_ZONE		5
 
+#define NUM_MAP_ATTRS			5
+
+/* If we map each sensor with every possible cdev for a zone */
+#define MAX_MAPS_PER_ZONE	(MAX_SENSORS_PER_ZONE * MAX_CDEVS_PER_ZONE)
+
 struct thermal_sensor;
 struct thermal_zone_device;
 struct thermal_cooling_device;
@@ -167,6 +172,20 @@ struct thermal_attr {
 	char name[THERMAL_NAME_LENGTH];
 };
 
+struct thermal_map {
+	enum thermal_trip_type trip_type;
+	char cdev_name[THERMAL_NAME_LENGTH];
+	char sensor_name[THERMAL_NAME_LENGTH];
+
+	int trip_mask;
+	int num_weights;
+	int *weights;
+};
+
+struct thermal_map_attr {
+	struct thermal_attr attrs[NUM_MAP_ATTRS];
+};
+
 /*
  * This structure defines the trip points for a sensor.
  * The actual values for these trip points come from
@@ -256,6 +275,10 @@ struct thermal_zone {
 	/* Thermal sensors trip information */
 	struct thermal_trip_point *sensor_trip[MAX_SENSORS_PER_ZONE];
 	struct thermal_trip_attr *trip_attr[MAX_SENSORS_PER_ZONE];
+
+	/* Thermal map information */
+	struct thermal_map *map[MAX_MAPS_PER_ZONE];
+	struct thermal_map_attr *map_attr[MAX_MAPS_PER_ZONE];
 };
 
 /* Structure that holds thermal governor information */
@@ -341,6 +364,8 @@ struct thermal_cooling_device *get_cdev_by_name(const char *);
 int add_sensor_trip_info(struct thermal_zone *, struct thermal_sensor *,
 			struct thermal_trip_point *);
 
+int add_map_entry(struct thermal_zone *, struct thermal_map *);
+
 #ifdef CONFIG_NET
 extern int thermal_generate_netlink_event(struct thermal_zone_device *tz,
 						enum events event);
-- 
1.7.9.5

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