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Subject[PATCH V2 1/6] thermal: Add a new trip type to use cooling device instance number
Date
This patch adds a new trip type THERMAL_TRIP_STATE_INSTANCE. This
trip behaves same as THERMAL_TRIP_ACTIVE but also passes the cooling
device instance number. This helps the cooling device registered as
different instances to perform appropriate cooling action decision in
the set_cur_state call back function.
Also since the trip temperature's are in ascending order so some logic
is put in place to skip the un-necessary checks.

Signed-off-by: Amit Daniel Kachhap <amit.kachhap@linaro.org>
---
Documentation/thermal/sysfs-api.txt | 4 +-
drivers/thermal/thermal_sys.c | 45 ++++++++++++++++++++++++++++++++--
include/linux/thermal.h | 1 +
3 files changed, 45 insertions(+), 5 deletions(-)
diff --git a/Documentation/thermal/sysfs-api.txt b/Documentation/thermal/sysfs-api.txt
index 1733ab9..9a7c69c 100644
--- a/Documentation/thermal/sysfs-api.txt
+++ b/Documentation/thermal/sysfs-api.txt
@@ -184,8 +184,8 @@ trip_point_[0-*]_temp

trip_point_[0-*]_type
Strings which indicate the type of the trip point.
- E.g. it can be one of critical, hot, passive, active[0-*] for ACPI
- thermal zone.
+ E.g. it can be one of critical, hot, passive, active[0-1],
+ state-instance[0-*] for ACPI thermal zone.
RO, Optional

cdev[0-*]
diff --git a/drivers/thermal/thermal_sys.c b/drivers/thermal/thermal_sys.c
index 220ce7e..9fc2150 100644
--- a/drivers/thermal/thermal_sys.c
+++ b/drivers/thermal/thermal_sys.c
@@ -192,6 +192,8 @@ trip_point_type_show(struct device *dev, struct device_attribute *attr,
return sprintf(buf, "passive\n");
case THERMAL_TRIP_ACTIVE:
return sprintf(buf, "active\n");
+ case THERMAL_TRIP_STATE_INSTANCE:
+ return sprintf(buf, "state-instance\n");
default:
return sprintf(buf, "unknown\n");
}
@@ -1034,10 +1036,10 @@ EXPORT_SYMBOL(thermal_cooling_device_unregister);

void thermal_zone_device_update(struct thermal_zone_device *tz)
{
- int count, ret = 0;
- long temp, trip_temp;
+ int count, ret = 0, inst_id;
+ long temp, trip_temp, max_state, last_trip_change = 0;
enum thermal_trip_type trip_type;
- struct thermal_cooling_device_instance *instance;
+ struct thermal_cooling_device_instance *instance, *state_instance;
struct thermal_cooling_device *cdev;

mutex_lock(&tz->lock);
@@ -1086,6 +1088,43 @@ void thermal_zone_device_update(struct thermal_zone_device *tz)
cdev->ops->set_cur_state(cdev, 0);
}
break;
+ case THERMAL_TRIP_STATE_INSTANCE:
+ list_for_each_entry(instance, &tz->cooling_devices,
+ node) {
+ if (instance->trip != count)
+ continue;
+
+ if (temp <= last_trip_change)
+ continue;
+
+ inst_id = 0;
+ /*
+ *For this instance how many instance of same
+ *cooling device occured before
+ */
+
+ list_for_each_entry(state_instance,
+ &tz->cooling_devices, node) {
+ if (instance->cdev ==
+ state_instance->cdev)
+ inst_id++;
+ if (state_instance->trip == count)
+ break;
+ }
+
+ cdev = instance->cdev;
+ cdev->ops->get_max_state(cdev, &max_state);
+
+ if ((temp >= trip_temp) &&
+ (inst_id <= max_state))
+ cdev->ops->set_cur_state(cdev, inst_id);
+ else if ((temp < trip_temp) &&
+ (--inst_id <= max_state))
+ cdev->ops->set_cur_state(cdev, inst_id);
+
+ last_trip_change = trip_temp;
+ }
+ break;
case THERMAL_TRIP_PASSIVE:
if (temp >= trip_temp || tz->passive)
thermal_zone_device_passive(tz, temp,
diff --git a/include/linux/thermal.h b/include/linux/thermal.h
index 796f1ff..583fbda 100644
--- a/include/linux/thermal.h
+++ b/include/linux/thermal.h
@@ -42,6 +42,7 @@ enum thermal_trip_type {
THERMAL_TRIP_PASSIVE,
THERMAL_TRIP_HOT,
THERMAL_TRIP_CRITICAL,
+ THERMAL_TRIP_STATE_INSTANCE,
};

struct thermal_zone_device_ops {
--
1.7.1


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