drivers/thermal/int3403_thermal.c

   1 /*
   2  * ACPI INT3403 thermal driver
   3  * Copyright (c) 2013, 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/types.h>
  19 #include <linux/acpi.h>
  20 #include <linux/thermal.h>
  21
  22 #define INT3403_TYPE_SENSOR             0x03
  23 #define INT3403_PERF_CHANGED_EVENT      0x80
  24 #define INT3403_THERMAL_EVENT           0x90
  25
  26 #define DECI_KELVIN_TO_MILLI_CELSIUS(t, off) (((t) - (off)) * 100)
  27 #define KELVIN_OFFSET   2732
  28 #define MILLI_CELSIUS_TO_DECI_KELVIN(t, off) (((t) / 100) + (off))
  29
  30 #define ACPI_INT3403_CLASS              "int3403"
  31 #define ACPI_INT3403_FILE_STATE         "state"
  32
  33 struct int3403_sensor {
  34         struct thermal_zone_device *tzone;
  35         unsigned long *thresholds;
  36         unsigned long   crit_temp;
  37         int             crit_trip_id;
  38         unsigned long   psv_temp;
  39         int             psv_trip_id;
  40 };
  41
  42 static int sys_get_curr_temp(struct thermal_zone_device *tzone,
  43                                 unsigned long *temp)
  44 {
  45         struct acpi_device *device = tzone->devdata;
  46         unsigned long long tmp;
  47         acpi_status status;
  48
  49         status = acpi_evaluate_integer(device->handle, "_TMP", NULL, &tmp);
  50         if (ACPI_FAILURE(status))
  51                 return -EIO;
  52
  53         *temp = DECI_KELVIN_TO_MILLI_CELSIUS(tmp, KELVIN_OFFSET);
  54
  55         return 0;
  56 }
  57
  58 static int sys_get_trip_hyst(struct thermal_zone_device *tzone,
  59                 int trip, unsigned long *temp)
  60 {
  61         struct acpi_device *device = tzone->devdata;
  62         unsigned long long hyst;
  63         acpi_status status;
  64
  65         status = acpi_evaluate_integer(device->handle, "GTSH", NULL, &hyst);
  66         if (ACPI_FAILURE(status))
  67                 return -EIO;
  68
  69         /*
  70          * Thermal hysteresis represents a temperature difference.
  71          * Kelvin and Celsius have same degree size. So the
  72          * conversion here between tenths of degree Kelvin unit
  73          * and Milli-Celsius unit is just to multiply 100.
  74          */
  75         *temp = hyst * 100;
  76
  77         return 0;
  78 }
  79
  80 static int sys_get_trip_temp(struct thermal_zone_device *tzone,
  81                 int trip, unsigned long *temp)
  82 {
  83         struct acpi_device *device = tzone->devdata;
  84         struct int3403_sensor *obj = acpi_driver_data(device);
  85
  86         if (trip == obj->crit_trip_id)
  87                 *temp = obj->crit_temp;
  88         else if (trip == obj->psv_trip_id)
  89                 *temp = obj->psv_temp;
  90         else {
  91                 /*
  92                  * get_trip_temp is a mandatory callback but
  93                  * PATx method doesn't return any value, so return
  94                  * cached value, which was last set from user space.
  95                  */
  96                 *temp = obj->thresholds[trip];
  97         }
  98
  99         return 0;
 100 }
 101
 102 static int sys_get_trip_type(struct thermal_zone_device *thermal,
 103                 int trip, enum thermal_trip_type *type)
 104 {
 105         struct acpi_device *device = thermal->devdata;
 106         struct int3403_sensor *obj = acpi_driver_data(device);
 107
 108         /* Mandatory callback, may not mean much here */
 109         if (trip == obj->crit_trip_id)
 110                 *type = THERMAL_TRIP_CRITICAL;
 111         else
 112                 *type = THERMAL_TRIP_PASSIVE;
 113
 114         return 0;
 115 }
 116
 117 int sys_set_trip_temp(struct thermal_zone_device *tzone, int trip,
 118                                                         unsigned long temp)
 119 {
 120         struct acpi_device *device = tzone->devdata;
 121         acpi_status status;
 122         char name[10];
 123         int ret = 0;
 124         struct int3403_sensor *obj = acpi_driver_data(device);
 125
 126         snprintf(name, sizeof(name), "PAT%d", trip);
 127         if (acpi_has_method(device->handle, name)) {
 128                 status = acpi_execute_simple_method(device->handle, name,
 129                                 MILLI_CELSIUS_TO_DECI_KELVIN(temp,
 130                                                         KELVIN_OFFSET));
 131                 if (ACPI_FAILURE(status))
 132                         ret = -EIO;
 133                 else
 134                         obj->thresholds[trip] = temp;
 135         } else {
 136                 ret = -EIO;
 137                 dev_err(&device->dev, "sys_set_trip_temp: method not found\n");
 138         }
 139
 140         return ret;
 141 }
 142
 143 static struct thermal_zone_device_ops tzone_ops = {
 144         .get_temp = sys_get_curr_temp,
 145         .get_trip_temp = sys_get_trip_temp,
 146         .get_trip_type = sys_get_trip_type,
 147         .set_trip_temp = sys_set_trip_temp,
 148         .get_trip_hyst =  sys_get_trip_hyst,
 149 };
 150
 151 static void acpi_thermal_notify(struct acpi_device *device, u32 event)
 152 {
 153         struct int3403_sensor *obj;
 154
 155         if (!device)
 156                 return;
 157
 158         obj = acpi_driver_data(device);
 159         if (!obj)
 160                 return;
 161
 162         switch (event) {
 163         case INT3403_PERF_CHANGED_EVENT:
 164                 break;
 165         case INT3403_THERMAL_EVENT:
 166                 thermal_zone_device_update(obj->tzone);
 167                 break;
 168         default:
 169                 dev_err(&device->dev, "Unsupported event [0x%x]\n", event);
 170                 break;
 171         }
 172 }
 173
 174 static int sys_get_trip_crt(struct acpi_device *device, unsigned long *temp)
 175 {
 176         unsigned long long crt;
 177         acpi_status status;
 178
 179         status = acpi_evaluate_integer(device->handle, "_CRT", NULL, &crt);
 180         if (ACPI_FAILURE(status))
 181                 return -EIO;
 182
 183         *temp = DECI_KELVIN_TO_MILLI_CELSIUS(crt, KELVIN_OFFSET);
 184
 185         return 0;
 186 }
 187
 188 static int sys_get_trip_psv(struct acpi_device *device, unsigned long *temp)
 189 {
 190         unsigned long long psv;
 191         acpi_status status;
 192
 193         status = acpi_evaluate_integer(device->handle, "_PSV", NULL, &psv);
 194         if (ACPI_FAILURE(status))
 195                 return -EIO;
 196
 197         *temp = DECI_KELVIN_TO_MILLI_CELSIUS(psv, KELVIN_OFFSET);
 198
 199         return 0;
 200 }
 201
 202 static int acpi_int3403_add(struct acpi_device *device)
 203 {
 204         int result = 0;
 205         unsigned long long ptyp;
 206         acpi_status status;
 207         struct int3403_sensor *obj;
 208         unsigned long long trip_cnt;
 209         int trip_mask = 0;
 210
 211         if (!device)
 212                 return -EINVAL;
 213
 214         status = acpi_evaluate_integer(device->handle, "PTYP", NULL, &ptyp);
 215         if (ACPI_FAILURE(status))
 216                 return -EINVAL;
 217
 218         if (ptyp != INT3403_TYPE_SENSOR)
 219                 return -EINVAL;
 220
 221         obj = devm_kzalloc(&device->dev, sizeof(*obj), GFP_KERNEL);
 222         if (!obj)
 223                 return -ENOMEM;
 224
 225         device->driver_data = obj;
 226
 227         status = acpi_evaluate_integer(device->handle, "PATC", NULL,
 228                                                 &trip_cnt);
 229         if (ACPI_FAILURE(status))
 230                 trip_cnt = 0;
 231
 232         if (trip_cnt) {
 233                 /* We have to cache, thresholds can't be readback */
 234                 obj->thresholds = devm_kzalloc(&device->dev,
 235                                         sizeof(*obj->thresholds) * trip_cnt,
 236                                         GFP_KERNEL);
 237                 if (!obj->thresholds)
 238                         return -ENOMEM;
 239                 trip_mask = BIT(trip_cnt) - 1;
 240         }
 241
 242         obj->psv_trip_id = -1;
 243         if (!sys_get_trip_psv(device, &obj->psv_temp))
 244                 obj->psv_trip_id = trip_cnt++;
 245
 246         obj->crit_trip_id = -1;
 247         if (!sys_get_trip_crt(device, &obj->crit_temp))
 248                 obj->crit_trip_id = trip_cnt++;
 249
 250         obj->tzone = thermal_zone_device_register(acpi_device_bid(device),
 251                                 trip_cnt, trip_mask, device, &tzone_ops,
 252                                 NULL, 0, 0);
 253         if (IS_ERR(obj->tzone)) {
 254                 result = PTR_ERR(obj->tzone);
 255                 return result;
 256         }
 257
 258         strcpy(acpi_device_name(device), "INT3403");
 259         strcpy(acpi_device_class(device), ACPI_INT3403_CLASS);
 260
 261         return 0;
 262 }
 263
 264 static int acpi_int3403_remove(struct acpi_device *device)
 265 {
 266         struct int3403_sensor *obj;
 267
 268         obj = acpi_driver_data(device);
 269         thermal_zone_device_unregister(obj->tzone);
 270
 271         return 0;
 272 }
 273
 274 ACPI_MODULE_NAME("int3403");
 275 static const struct acpi_device_id int3403_device_ids[] = {
 276         {"INT3403", 0},
 277         {"", 0},
 278 };
 279 MODULE_DEVICE_TABLE(acpi, int3403_device_ids);
 280
 281 static struct acpi_driver acpi_int3403_driver = {
 282         .name = "INT3403",
 283         .class = ACPI_INT3403_CLASS,
 284         .ids = int3403_device_ids,
 285         .ops = {
 286                 .add = acpi_int3403_add,
 287                 .remove = acpi_int3403_remove,
 288                 .notify = acpi_thermal_notify,
 289                 },
 290 };
 291
 292 module_acpi_driver(acpi_int3403_driver);
 293
 294 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
 295 MODULE_LICENSE("GPL v2");
 296 MODULE_DESCRIPTION("ACPI INT3403 thermal driver");