Quelle  thermal_trip.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0
/*
 *  Copyright (C) 2008 Intel Corp
 *  Copyright (C) 2008 Zhang Rui <rui.zhang@intel.com>
 *  Copyright (C) 2008 Sujith Thomas <sujith.thomas@intel.com>
 *  Copyright 2022 Linaro Limited
 *
 * Thermal trips handling
 */
#include "thermal_core.h"

static const char *trip_type_names[] = {
 [THERMAL_TRIP_ACTIVE] = "active",
 [THERMAL_TRIP_PASSIVE] = "passive",
 [THERMAL_TRIP_HOT] = "hot",
 [THERMAL_TRIP_CRITICAL] = "critical",
};

const char *thermal_trip_type_name(enum thermal_trip_type trip_type)
{
 if (trip_type < THERMAL_TRIP_ACTIVE || trip_type > THERMAL_TRIP_CRITICAL)
  return "unknown";

 return trip_type_names[trip_type];
}

int for_each_thermal_trip(struct thermal_zone_device *tz,
     int (*cb)(struct thermal_trip *, void *),
     void *data)
{
 struct thermal_trip_desc *td;
 int ret;

 for_each_trip_desc(tz, td) {
  ret = cb(&td->trip, data);
  if (ret)
   return ret;
 }

 return 0;
}
EXPORT_SYMBOL_GPL(for_each_thermal_trip);

int thermal_zone_for_each_trip(struct thermal_zone_device *tz,
          int (*cb)(struct thermal_trip *, void *),
          void *data)
{
 guard(thermal_zone)(tz);

 return for_each_thermal_trip(tz, cb, data);
}
EXPORT_SYMBOL_GPL(thermal_zone_for_each_trip);

void thermal_zone_set_trips(struct thermal_zone_device *tz, int low, int high)
{
 int ret;

 lockdep_assert_held(&tz->lock);

 if (!tz->ops.set_trips)
  return;

 /* No need to change trip points */
 if (tz->prev_low_trip == low && tz->prev_high_trip == high)
  return;

 tz->prev_low_trip = low;
 tz->prev_high_trip = high;

 dev_dbg(&tz->device,
  "new temperature boundaries: %d < x < %d\n", low, high);

 /*
 * Set a temperature window. When this window is left the driver
 * must inform the thermal core via thermal_zone_device_update.
 */
 ret = tz->ops.set_trips(tz, low, high);
 if (ret)
  dev_err(&tz->device, "Failed to set trips: %d\n", ret);
}

int thermal_zone_trip_id(const struct thermal_zone_device *tz,
    const struct thermal_trip *trip)
{
 /*
 * Assume the trip to be located within the bounds of the thermal
 * zone's trips[] table.
 */
 return trip_to_trip_desc(trip) - tz->trips;
}