drivers/thermal/backward_compatible.c

   1 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   2
   3 #include <linux/module.h>
   4 #include <linux/thermal.h>
   5
   6 #include "thermal_core.h"
   7
   8 /**
   9  * backward_compatible_throttle
  10  * @tz - thermal_zone_device
  11  *
  12  * This function update the cooler state by monitoring the current temperature and trip points
  13  */
  14 static int backward_compatible_throttle(struct thermal_zone_device *tz, int trip)
  15 {
  16         long trip_temp;
  17         struct thermal_instance *instance;
  18
  19         if (trip == THERMAL_TRIPS_NONE) {
  20                 trip_temp = tz->forced_passive;
  21         } else {
  22                 tz->ops->get_trip_temp(tz, trip, &trip_temp);
  23         }
  24
  25         /* mutex_lock(&tz->lock); */
  26
  27         list_for_each_entry(instance, &tz->thermal_instances, tz_node) {
  28                 if (instance->trip != trip)
  29                         continue;
  30
  31                 if (tz->temperature >= trip_temp)
  32                         instance->target = 1;
  33                 else
  34                         instance->target = 0;
  35                 instance->cdev->updated = false;
  36                 thermal_cdev_update(instance->cdev);
  37         }
  38
  39         /* mutex_unlock(&tz->lock); */
  40
  41         return 0;
  42 }
  43
  44 static struct thermal_governor thermal_gov_backward_compatible = {
  45         .name = "backward_compatible",
  46         .throttle = backward_compatible_throttle,
  47         /* .owner                = THIS_MODULE, */
  48 };
  49
  50 static int __init thermal_gov_backward_compatible_init(void)
  51 {
  52         return thermal_register_governor(&thermal_gov_backward_compatible);
  53 }
  54
  55 static void __exit thermal_gov_backward_compatible_exit(void)
  56 {
  57         thermal_unregister_governor(&thermal_gov_backward_compatible);
  58 }
  59
  60 /* This should load after thermal framework */
  61 fs_initcall(thermal_gov_backward_compatible_init);
  62 module_exit(thermal_gov_backward_compatible_exit);
  63
  64 MODULE_AUTHOR("Weiyi Lu");
  65 MODULE_DESCRIPTION("A backward compatible Thermal governor");
  66 MODULE_LICENSE("GPL");