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Date: Tue, 18 Dec 2012 14:59:34 +0530
From: Durgadoss R <durgadoss.r@...el.com>
To: rui.zhang@...el.com, linux-pm@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, hongbo.zhang@...aro.org,
wni@...dia.com, Durgadoss R <durgadoss.r@...el.com>
Subject: [PATCH 5/8] Thermal: Add 'thermal_map' sysfs node
This patch creates a thermal map sysfs node under
/sys/class/thermal/thermal_zoneX/. This contains
entries named map0, map1 .. mapN. Each map has the
following space separated values:
trip_type sensor_name cdev_name trip_mask weights
Signed-off-by: Durgadoss R <durgadoss.r@...el.com>
---
drivers/thermal/thermal_sys.c | 149 ++++++++++++++++++++++++++++++++++++++++-
include/linux/thermal.h | 29 ++++++++
2 files changed, 176 insertions(+), 2 deletions(-)
diff --git a/drivers/thermal/thermal_sys.c b/drivers/thermal/thermal_sys.c
index 29ec073..a3adc00 100644
--- a/drivers/thermal/thermal_sys.c
+++ b/drivers/thermal/thermal_sys.c
@@ -506,6 +506,41 @@ static void remove_cdev_from_zone(struct thermal_zone *tz,
tz->cdev_indx--;
}
+static void __clean_map_entry(struct thermal_zone *tz, int i)
+{
+ tz->map[i] = NULL;
+ sysfs_remove_file(tz->kobj_thermal_map, &tz->map_attr[i]->attr.attr);
+ /* Free map attributes */
+ kfree(tz->map_attr[i]);
+ tz->map_attr[i] = 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)) {
+ __clean_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)) {
+ __clean_map_entry(tz, i);
+ }
+ }
+}
+
/* sys I/F for thermal zone */
#define to_thermal_zone(_dev) \
@@ -898,6 +933,52 @@ policy_show(struct device *dev, struct device_attribute *devattr, char *buf)
}
static ssize_t
+map_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
+{
+ int i, indx, ret = 0;
+ struct thermal_zone *tz;
+ struct thermal_map *map;
+ struct device *dev;
+ char *trip;
+
+ /*
+ * For maps under /sys/class/thermal/zoneX/thermal_map/mapY:
+ * attr points to mapY
+ * kobj points to thermal_map
+ * kobj->parent points to zoneX
+ */
+
+ /* Get zone pointer */
+ dev = container_of(kobj->parent, struct device, kobj);
+ tz = to_zone(dev);
+ if (!tz)
+ return -EINVAL;
+
+ sscanf(attr->attr.name, "map%d", &indx);
+
+ if (indx < 0 || indx >= MAX_MAPS_PER_ZONE)
+ return -EINVAL;
+
+ if (!tz->map[indx])
+ return sprintf(buf, "<Unavailable>\n");
+
+ map = tz->map[indx];
+
+ trip = (map->trip_type == THERMAL_TRIP_ACTIVE) ?
+ "active" : "passive";
+ ret += sprintf(buf, "%s", trip);
+ ret += sprintf(buf + ret, " %s", map->sensor_name);
+ ret += sprintf(buf + ret, " %s", map->cdev_name);
+ ret += sprintf(buf + ret, " 0x%x", map->trip_mask);
+
+ for (i = 0; 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 kobject *kobj, struct kobj_attribute *attr, char *buf)
{
int i, indx, ret = 0;
@@ -1676,8 +1757,10 @@ 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);
@@ -1931,12 +2014,19 @@ struct thermal_zone *create_thermal_zone(const char *name, void *devdata)
if (!tz->kobj_thermal_trip)
goto exit_name;
+ tz->kobj_thermal_map = kobject_create_and_add("thermal_map",
+ &tz->device.kobj);
+ if (!tz->kobj_thermal_map)
+ goto exit_trip;
+
/* Add this zone to the global list of thermal zones */
mutex_lock(&zone_list_lock);
list_add_tail(&tz->node, &thermal_zone_list);
mutex_unlock(&zone_list_lock);
return tz;
+exit_trip:
+ kobject_del(tz->kobj_thermal_trip);
exit_name:
device_remove_file(&tz->device, &dev_attr_zone_name);
exit_unregister:
@@ -2000,6 +2090,12 @@ void remove_thermal_zone(struct thermal_zone *tz)
kobject_name(&tz->cdevs[i]->device.kobj));
}
+ for (i = 0; i < MAX_MAPS_PER_ZONE; i++)
+ __clean_map_entry(tz, i);
+
+ /* Remove /sys/class/thermal/zoneX/thermal_map */
+ kobject_del(tz->kobj_thermal_map);
+
release_idr(&thermal_zone_idr, &thermal_idr_lock, tz->id);
idr_destroy(&tz->idr);
@@ -2045,6 +2141,53 @@ struct thermal_sensor *get_sensor_by_name(const char *name)
}
EXPORT_SYMBOL(get_sensor_by_name);
+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;
+ }
+
+ sprintf(tz->map_attr[indx]->name, "map%d", indx);
+
+ tz->map_attr[indx]->attr.attr.name = tz->map_attr[indx]->name;
+ tz->map_attr[indx]->attr.attr.mode = S_IRUGO;
+ tz->map_attr[indx]->attr.show = map_show;
+
+ sysfs_attr_init(&tz->map_attr[indx]->attr.attr);
+ ret = sysfs_create_file(tz->kobj_thermal_map,
+ &tz->map_attr[indx]->attr.attr);
+ 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;
@@ -2251,8 +2394,10 @@ 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 8372f05..581dc87 100644
--- a/include/linux/thermal.h
+++ b/include/linux/thermal.h
@@ -53,6 +53,9 @@
#define MAX_CDEVS_PER_ZONE 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;
@@ -158,6 +161,21 @@ struct thermal_attr {
char name[THERMAL_NAME_LENGTH];
};
+struct thermal_map_attr {
+ struct kobj_attribute 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;
+};
+
/*
* This structure defines the trip points for a sensor.
* The actual values for these trip points come from
@@ -249,6 +267,15 @@ struct thermal_zone {
struct kobject *kobj_thermal_trip;
struct kobject *kobj_trip[MAX_SENSORS_PER_ZONE];
struct thermal_trip_point *sensor_trip[MAX_SENSORS_PER_ZONE];
+
+ /*
+ * Thermal map information:
+ * kobj_thermal_map: /sys/class/thermal/zoneX/thermal_map
+ * map_attr: /sys/class/thermal/zoneX/thermal_map/mapY
+ */
+ struct kobject *kobj_thermal_map;
+ struct thermal_map_attr *map_attr[MAX_MAPS_PER_ZONE];
+ struct thermal_map *map[MAX_MAPS_PER_ZONE];
};
/* Structure that holds thermal governor information */
@@ -332,6 +359,8 @@ int add_cdev_to_zone(struct thermal_zone *, struct thermal_cooling_device *);
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(u32 orig, enum events event);
#else
--
1.7.9.5
--
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