kernel/drivers/thermal/int340x_thermal/int340x_thermal_zone.c

   1 /*
   2  * int340x_thermal_zone.c
   3  * Copyright (c) 2015, Intel Corporation.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms and conditions of the GNU General Public License,
   7  * version 2, as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  */
  15 #include <linux/kernel.h>
  16 #include <linux/module.h>
  17 #include <linux/init.h>
  18 #include <linux/acpi.h>
  19 #include <linux/thermal.h>
  20 #include "int340x_thermal_zone.h"
  21
  22 static int int340x_thermal_get_zone_temp(struct thermal_zone_device *zone,
  23                                          unsigned long *temp)
  24 {
  25         struct int34x_thermal_zone *d = zone->devdata;
  26         unsigned long long tmp;
  27         acpi_status status;
  28
  29         if (d->override_ops && d->override_ops->get_temp)
  30                 return d->override_ops->get_temp(zone, temp);
  31
  32         status = acpi_evaluate_integer(d->adev->handle, "_TMP", NULL, &tmp);
  33         if (ACPI_FAILURE(status))
  34                 return -EIO;
  35
  36         if (d->lpat_table) {
  37                 int conv_temp;
  38
  39                 conv_temp = acpi_lpat_raw_to_temp(d->lpat_table, (int)tmp);
  40                 if (conv_temp < 0)
  41                         return conv_temp;
  42
  43                 *temp = (unsigned long)conv_temp * 10;
  44         } else
  45                 /* _TMP returns the temperature in tenths of degrees Kelvin */
  46                 *temp = DECI_KELVIN_TO_MILLICELSIUS(tmp);
  47
  48         return 0;
  49 }
  50
  51 static int int340x_thermal_get_trip_temp(struct thermal_zone_device *zone,
  52                                          int trip, unsigned long *temp)
  53 {
  54         struct int34x_thermal_zone *d = zone->devdata;
  55         int i;
  56
  57         if (d->override_ops && d->override_ops->get_trip_temp)
  58                 return d->override_ops->get_trip_temp(zone, trip, temp);
  59
  60         if (trip < d->aux_trip_nr)
  61                 *temp = d->aux_trips[trip];
  62         else if (trip == d->crt_trip_id)
  63                 *temp = d->crt_temp;
  64         else if (trip == d->psv_trip_id)
  65                 *temp = d->psv_temp;
  66         else if (trip == d->hot_trip_id)
  67                 *temp = d->hot_temp;
  68         else {
  69                 for (i = 0; i < INT340X_THERMAL_MAX_ACT_TRIP_COUNT; i++) {
  70                         if (d->act_trips[i].valid &&
  71                             d->act_trips[i].id == trip) {
  72                                 *temp = d->act_trips[i].temp;
  73                                 break;
  74                         }
  75                 }
  76                 if (i == INT340X_THERMAL_MAX_ACT_TRIP_COUNT)
  77                         return -EINVAL;
  78         }
  79
  80         return 0;
  81 }
  82
  83 static int int340x_thermal_get_trip_type(struct thermal_zone_device *zone,
  84                                          int trip,
  85                                          enum thermal_trip_type *type)
  86 {
  87         struct int34x_thermal_zone *d = zone->devdata;
  88         int i;
  89
  90         if (d->override_ops && d->override_ops->get_trip_type)
  91                 return d->override_ops->get_trip_type(zone, trip, type);
  92
  93         if (trip < d->aux_trip_nr)
  94                 *type = THERMAL_TRIP_PASSIVE;
  95         else if (trip == d->crt_trip_id)
  96                 *type = THERMAL_TRIP_CRITICAL;
  97         else if (trip == d->hot_trip_id)
  98                 *type = THERMAL_TRIP_HOT;
  99         else if (trip == d->psv_trip_id)
 100                 *type = THERMAL_TRIP_PASSIVE;
 101         else {
 102                 for (i = 0; i < INT340X_THERMAL_MAX_ACT_TRIP_COUNT; i++) {
 103                         if (d->act_trips[i].valid &&
 104                             d->act_trips[i].id == trip) {
 105                                 *type = THERMAL_TRIP_ACTIVE;
 106                                 break;
 107                         }
 108                 }
 109                 if (i == INT340X_THERMAL_MAX_ACT_TRIP_COUNT)
 110                         return -EINVAL;
 111         }
 112
 113         return 0;
 114 }
 115
 116 static int int340x_thermal_set_trip_temp(struct thermal_zone_device *zone,
 117                                       int trip, unsigned long temp)
 118 {
 119         struct int34x_thermal_zone *d = zone->devdata;
 120         acpi_status status;
 121         char name[10];
 122
 123         if (d->override_ops && d->override_ops->set_trip_temp)
 124                 return d->override_ops->set_trip_temp(zone, trip, temp);
 125
 126         snprintf(name, sizeof(name), "PAT%d", trip);
 127         status = acpi_execute_simple_method(d->adev->handle, name,
 128                         MILLICELSIUS_TO_DECI_KELVIN(temp));
 129         if (ACPI_FAILURE(status))
 130                 return -EIO;
 131
 132         d->aux_trips[trip] = temp;
 133
 134         return 0;
 135 }
 136
 137
 138 static int int340x_thermal_get_trip_hyst(struct thermal_zone_device *zone,
 139                 int trip, unsigned long *temp)
 140 {
 141         struct int34x_thermal_zone *d = zone->devdata;
 142         acpi_status status;
 143         unsigned long long hyst;
 144
 145         if (d->override_ops && d->override_ops->get_trip_hyst)
 146                 return d->override_ops->get_trip_hyst(zone, trip, temp);
 147
 148         status = acpi_evaluate_integer(d->adev->handle, "GTSH", NULL, &hyst);
 149         if (ACPI_FAILURE(status))
 150                 return -EIO;
 151
 152         *temp = hyst * 100;
 153
 154         return 0;
 155 }
 156
 157 static struct thermal_zone_device_ops int340x_thermal_zone_ops = {
 158         .get_temp       = int340x_thermal_get_zone_temp,
 159         .get_trip_temp  = int340x_thermal_get_trip_temp,
 160         .get_trip_type  = int340x_thermal_get_trip_type,
 161         .set_trip_temp  = int340x_thermal_set_trip_temp,
 162         .get_trip_hyst =  int340x_thermal_get_trip_hyst,
 163 };
 164
 165 static int int340x_thermal_get_trip_config(acpi_handle handle, char *name,
 166                                       unsigned long *temp)
 167 {
 168         unsigned long long r;
 169         acpi_status status;
 170
 171         status = acpi_evaluate_integer(handle, name, NULL, &r);
 172         if (ACPI_FAILURE(status))
 173                 return -EIO;
 174
 175         *temp = DECI_KELVIN_TO_MILLICELSIUS(r);
 176
 177         return 0;
 178 }
 179
 180 static struct thermal_zone_params int340x_thermal_params = {
 181         .governor_name = "user_space",
 182         .no_hwmon = true,
 183 };
 184
 185 struct int34x_thermal_zone *int340x_thermal_zone_add(struct acpi_device *adev,
 186                                 struct thermal_zone_device_ops *override_ops)
 187 {
 188         struct int34x_thermal_zone *int34x_thermal_zone;
 189         acpi_status status;
 190         unsigned long long trip_cnt;
 191         int trip_mask = 0, i;
 192         int ret;
 193
 194         int34x_thermal_zone = kzalloc(sizeof(*int34x_thermal_zone),
 195                                       GFP_KERNEL);
 196         if (!int34x_thermal_zone)
 197                 return ERR_PTR(-ENOMEM);
 198
 199         int34x_thermal_zone->adev = adev;
 200         int34x_thermal_zone->override_ops = override_ops;
 201
 202         status = acpi_evaluate_integer(adev->handle, "PATC", NULL, &trip_cnt);
 203         if (ACPI_FAILURE(status))
 204                 trip_cnt = 0;
 205         else {
 206                 int34x_thermal_zone->aux_trips = kzalloc(
 207                                 sizeof(*int34x_thermal_zone->aux_trips) *
 208                                 trip_cnt, GFP_KERNEL);
 209                 if (!int34x_thermal_zone->aux_trips) {
 210                         ret = -ENOMEM;
 211                         goto err_trip_alloc;
 212                 }
 213                 trip_mask = BIT(trip_cnt) - 1;
 214                 int34x_thermal_zone->aux_trip_nr = trip_cnt;
 215         }
 216
 217         int34x_thermal_zone->crt_trip_id = -1;
 218         if (!int340x_thermal_get_trip_config(adev->handle, "_CRT",
 219                                              &int34x_thermal_zone->crt_temp))
 220                 int34x_thermal_zone->crt_trip_id = trip_cnt++;
 221         int34x_thermal_zone->hot_trip_id = -1;
 222         if (!int340x_thermal_get_trip_config(adev->handle, "_HOT",
 223                                              &int34x_thermal_zone->hot_temp))
 224                 int34x_thermal_zone->hot_trip_id = trip_cnt++;
 225         int34x_thermal_zone->psv_trip_id = -1;
 226         if (!int340x_thermal_get_trip_config(adev->handle, "_PSV",
 227                                              &int34x_thermal_zone->psv_temp))
 228                 int34x_thermal_zone->psv_trip_id = trip_cnt++;
 229         for (i = 0; i < INT340X_THERMAL_MAX_ACT_TRIP_COUNT; i++) {
 230                 char name[5] = { '_', 'A', 'C', '0' + i, '\0' };
 231
 232                 if (int340x_thermal_get_trip_config(adev->handle, name,
 233                                 &int34x_thermal_zone->act_trips[i].temp))
 234                         break;
 235
 236                 int34x_thermal_zone->act_trips[i].id = trip_cnt++;
 237                 int34x_thermal_zone->act_trips[i].valid = true;
 238         }
 239         int34x_thermal_zone->lpat_table = acpi_lpat_get_conversion_table(
 240                                                                 adev->handle);
 241
 242         int34x_thermal_zone->zone = thermal_zone_device_register(
 243                                                 acpi_device_bid(adev),
 244                                                 trip_cnt,
 245                                                 trip_mask, int34x_thermal_zone,
 246                                                 &int340x_thermal_zone_ops,
 247                                                 &int340x_thermal_params,
 248                                                 0, 0);
 249         if (IS_ERR(int34x_thermal_zone->zone)) {
 250                 ret = PTR_ERR(int34x_thermal_zone->zone);
 251                 goto err_thermal_zone;
 252         }
 253
 254         return int34x_thermal_zone;
 255
 256 err_thermal_zone:
 257         acpi_lpat_free_conversion_table(int34x_thermal_zone->lpat_table);
 258         kfree(int34x_thermal_zone->aux_trips);
 259 err_trip_alloc:
 260         kfree(int34x_thermal_zone);
 261         return ERR_PTR(ret);
 262 }
 263 EXPORT_SYMBOL_GPL(int340x_thermal_zone_add);
 264
 265 void int340x_thermal_zone_remove(struct int34x_thermal_zone
 266                                  *int34x_thermal_zone)
 267 {
 268         thermal_zone_device_unregister(int34x_thermal_zone->zone);
 269         acpi_lpat_free_conversion_table(int34x_thermal_zone->lpat_table);
 270         kfree(int34x_thermal_zone->aux_trips);
 271         kfree(int34x_thermal_zone);
 272 }
 273 EXPORT_SYMBOL_GPL(int340x_thermal_zone_remove);
 274
 275 MODULE_AUTHOR("Aaron Lu <aaron.lu@intel.com>");
 276 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
 277 MODULE_DESCRIPTION("Intel INT340x common thermal zone handler");
 278 MODULE_LICENSE("GPL v2");