Quelle  cxgb4_thermal.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0-only
/*
 *  Copyright (C) 2017 Chelsio Communications.  All rights reserved.
 *
 *  Written by: Ganesh Goudar (ganeshgr@chelsio.com)
 */

#include "cxgb4.h"

#define CXGB4_NUM_TRIPS 1

static int cxgb4_thermal_get_temp(struct thermal_zone_device *tzdev,
      int *temp)
{
 struct adapter *adap = thermal_zone_device_priv(tzdev);
 u32 param, val;
 int ret;

 param = (FW_PARAMS_MNEM_V(FW_PARAMS_MNEM_DEV) |
   FW_PARAMS_PARAM_X_V(FW_PARAMS_PARAM_DEV_DIAG) |
   FW_PARAMS_PARAM_Y_V(FW_PARAM_DEV_DIAG_TMP));

 ret = t4_query_params(adap, adap->mbox, adap->pf, 0, 1,
         ¶m, &val);
 if (ret < 0 || val == 0)
  return -1;

 *temp = val * 1000;
 return 0;
}

static const struct thermal_zone_device_ops cxgb4_thermal_ops = {
 .get_temp = cxgb4_thermal_get_temp,
};

static struct thermal_trip trip = { .type = THERMAL_TRIP_CRITICAL } ;

int cxgb4_thermal_init(struct adapter *adap)
{
 struct ch_thermal *ch_thermal = &adap->ch_thermal;
 char ch_tz_name[THERMAL_NAME_LENGTH];
 int num_trip = CXGB4_NUM_TRIPS;
 u32 param, val;
 int ret;

 /* on older firmwares we may not get the trip temperature,
 * set the num of trips to 0.
 */
 param = (FW_PARAMS_MNEM_V(FW_PARAMS_MNEM_DEV) |
   FW_PARAMS_PARAM_X_V(FW_PARAMS_PARAM_DEV_DIAG) |
   FW_PARAMS_PARAM_Y_V(FW_PARAM_DEV_DIAG_MAXTMPTHRESH));

 ret = t4_query_params(adap, adap->mbox, adap->pf, 0, 1,
         ¶m, &val);
 if (ret < 0) {
  num_trip = 0; /* could not get trip temperature */
 } else {
  trip.temperature = val * 1000;
 }

 snprintf(ch_tz_name, sizeof(ch_tz_name), "cxgb4_%s", adap->name);
 ch_thermal->tzdev = thermal_zone_device_register_with_trips(ch_tz_name, &trip, num_trip,
            adap,
            &cxgb4_thermal_ops,
            NULL, 0, 0);
 if (IS_ERR(ch_thermal->tzdev)) {
  ret = PTR_ERR(ch_thermal->tzdev);
  dev_err(adap->pdev_dev, "Failed to register thermal zone\n");
  ch_thermal->tzdev = NULL;
  return ret;
 }

 ret = thermal_zone_device_enable(ch_thermal->tzdev);
 if (ret) {
  dev_err(adap->pdev_dev, "Failed to enable thermal zone\n");
  thermal_zone_device_unregister(adap->ch_thermal.tzdev);
  return ret;
 }

 return 0;
}

int cxgb4_thermal_remove(struct adapter *adap)
{
 if (adap->ch_thermal.tzdev) {
  thermal_zone_device_unregister(adap->ch_thermal.tzdev);
  adap->ch_thermal.tzdev = NULL;
 }
 return 0;
}