drivers/thermal/int340x_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 #include <linux/platform_device.h>
  22 #include "int340x_thermal_zone.h"
  23
  24 #define INT3403_TYPE_SENSOR             0x03
  25 #define INT3403_TYPE_CHARGER            0x0B
  26 #define INT3403_TYPE_BATTERY            0x0C
  27 #define INT3403_PERF_CHANGED_EVENT      0x80
  28 #define INT3403_PERF_TRIP_POINT_CHANGED 0x81
  29 #define INT3403_THERMAL_EVENT           0x90
  30
  31 /* Preserved structure for future expandbility */
  32 struct int3403_sensor {
  33         struct int34x_thermal_zone *int340x_zone;
  34 };
  35
  36 struct int3403_performance_state {
  37         u64 performance;
  38         u64 power;
  39         u64 latency;
  40         u64 linear;
  41         u64 control;
  42         u64 raw_performace;
  43         char *raw_unit;
  44         int reserved;
  45 };
  46
  47 struct int3403_cdev {
  48         struct thermal_cooling_device *cdev;
  49         unsigned long max_state;
  50 };
  51
  52 struct int3403_priv {
  53         struct platform_device *pdev;
  54         struct acpi_device *adev;
  55         unsigned long long type;
  56         void *priv;
  57 };
  58
  59 static void int3403_notify(acpi_handle handle,
  60                 u32 event, void *data)
  61 {
  62         struct int3403_priv *priv = data;
  63         struct int3403_sensor *obj;
  64
  65         if (!priv)
  66                 return;
  67
  68         obj = priv->priv;
  69         if (priv->type != INT3403_TYPE_SENSOR || !obj)
  70                 return;
  71
  72         switch (event) {
  73         case INT3403_PERF_CHANGED_EVENT:
  74                 break;
  75         case INT3403_THERMAL_EVENT:
  76                 int340x_thermal_zone_device_update(obj->int340x_zone,
  77                                                    THERMAL_TRIP_VIOLATED);
  78                 break;
  79         case INT3403_PERF_TRIP_POINT_CHANGED:
  80                 int340x_thermal_read_trips(obj->int340x_zone);
  81                 int340x_thermal_zone_device_update(obj->int340x_zone,
  82                                                    THERMAL_TRIP_CHANGED);
  83                 break;
  84         default:
  85                 dev_err(&priv->pdev->dev, "Unsupported event [0x%x]\n", event);
  86                 break;
  87         }
  88 }
  89
  90 static int int3403_sensor_add(struct int3403_priv *priv)
  91 {
  92         int result = 0;
  93         struct int3403_sensor *obj;
  94
  95         obj = devm_kzalloc(&priv->pdev->dev, sizeof(*obj), GFP_KERNEL);
  96         if (!obj)
  97                 return -ENOMEM;
  98
  99         priv->priv = obj;
 100
 101         obj->int340x_zone = int340x_thermal_zone_add(priv->adev, NULL);
 102         if (IS_ERR(obj->int340x_zone))
 103                 return PTR_ERR(obj->int340x_zone);
 104
 105         result = acpi_install_notify_handler(priv->adev->handle,
 106                         ACPI_DEVICE_NOTIFY, int3403_notify,
 107                         (void *)priv);
 108         if (result)
 109                 goto err_free_obj;
 110
 111         return 0;
 112
 113  err_free_obj:
 114         int340x_thermal_zone_remove(obj->int340x_zone);
 115         return result;
 116 }
 117
 118 static int int3403_sensor_remove(struct int3403_priv *priv)
 119 {
 120         struct int3403_sensor *obj = priv->priv;
 121
 122         acpi_remove_notify_handler(priv->adev->handle,
 123                                    ACPI_DEVICE_NOTIFY, int3403_notify);
 124         int340x_thermal_zone_remove(obj->int340x_zone);
 125
 126         return 0;
 127 }
 128
 129 /* INT3403 Cooling devices */
 130 static int int3403_get_max_state(struct thermal_cooling_device *cdev,
 131                                  unsigned long *state)
 132 {
 133         struct int3403_priv *priv = cdev->devdata;
 134         struct int3403_cdev *obj = priv->priv;
 135
 136         *state = obj->max_state;
 137         return 0;
 138 }
 139
 140 static int int3403_get_cur_state(struct thermal_cooling_device *cdev,
 141                                  unsigned long *state)
 142 {
 143         struct int3403_priv *priv = cdev->devdata;
 144         unsigned long long level;
 145         acpi_status status;
 146
 147         status = acpi_evaluate_integer(priv->adev->handle, "PPPC", NULL, &level);
 148         if (ACPI_SUCCESS(status)) {
 149                 *state = level;
 150                 return 0;
 151         } else
 152                 return -EINVAL;
 153 }
 154
 155 static int
 156 int3403_set_cur_state(struct thermal_cooling_device *cdev, unsigned long state)
 157 {
 158         struct int3403_priv *priv = cdev->devdata;
 159         acpi_status status;
 160
 161         status = acpi_execute_simple_method(priv->adev->handle, "SPPC", state);
 162         if (ACPI_SUCCESS(status))
 163                 return 0;
 164         else
 165                 return -EINVAL;
 166 }
 167
 168 static const struct thermal_cooling_device_ops int3403_cooling_ops = {
 169         .get_max_state = int3403_get_max_state,
 170         .get_cur_state = int3403_get_cur_state,
 171         .set_cur_state = int3403_set_cur_state,
 172 };
 173
 174 static int int3403_cdev_add(struct int3403_priv *priv)
 175 {
 176         int result = 0;
 177         acpi_status status;
 178         struct int3403_cdev *obj;
 179         struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL };
 180         union acpi_object *p;
 181
 182         obj = devm_kzalloc(&priv->pdev->dev, sizeof(*obj), GFP_KERNEL);
 183         if (!obj)
 184                 return -ENOMEM;
 185
 186         status = acpi_evaluate_object(priv->adev->handle, "PPSS", NULL, &buf);
 187         if (ACPI_FAILURE(status))
 188                 return -ENODEV;
 189
 190         p = buf.pointer;
 191         if (!p || (p->type != ACPI_TYPE_PACKAGE)) {
 192                 printk(KERN_WARNING "Invalid PPSS data\n");
 193                 kfree(buf.pointer);
 194                 return -EFAULT;
 195         }
 196
 197         obj->max_state = p->package.count - 1;
 198         obj->cdev =
 199                 thermal_cooling_device_register(acpi_device_bid(priv->adev),
 200                                 priv, &int3403_cooling_ops);
 201         if (IS_ERR(obj->cdev))
 202                 result = PTR_ERR(obj->cdev);
 203
 204         priv->priv = obj;
 205
 206         kfree(buf.pointer);
 207         /* TODO: add ACPI notification support */
 208
 209         return result;
 210 }
 211
 212 static int int3403_cdev_remove(struct int3403_priv *priv)
 213 {
 214         struct int3403_cdev *obj = priv->priv;
 215
 216         thermal_cooling_device_unregister(obj->cdev);
 217         return 0;
 218 }
 219
 220 static int int3403_add(struct platform_device *pdev)
 221 {
 222         struct int3403_priv *priv;
 223         int result = 0;
 224         acpi_status status;
 225
 226         priv = devm_kzalloc(&pdev->dev, sizeof(struct int3403_priv),
 227                             GFP_KERNEL);
 228         if (!priv)
 229                 return -ENOMEM;
 230
 231         priv->pdev = pdev;
 232         priv->adev = ACPI_COMPANION(&(pdev->dev));
 233         if (!priv->adev) {
 234                 result = -EINVAL;
 235                 goto err;
 236         }
 237
 238         status = acpi_evaluate_integer(priv->adev->handle, "PTYP",
 239                                        NULL, &priv->type);
 240         if (ACPI_FAILURE(status)) {
 241                 result = -EINVAL;
 242                 goto err;
 243         }
 244
 245         platform_set_drvdata(pdev, priv);
 246         switch (priv->type) {
 247         case INT3403_TYPE_SENSOR:
 248                 result = int3403_sensor_add(priv);
 249                 break;
 250         case INT3403_TYPE_CHARGER:
 251         case INT3403_TYPE_BATTERY:
 252                 result = int3403_cdev_add(priv);
 253                 break;
 254         default:
 255                 result = -EINVAL;
 256         }
 257
 258         if (result)
 259                 goto err;
 260         return result;
 261
 262 err:
 263         return result;
 264 }
 265
 266 static int int3403_remove(struct platform_device *pdev)
 267 {
 268         struct int3403_priv *priv = platform_get_drvdata(pdev);
 269
 270         switch (priv->type) {
 271         case INT3403_TYPE_SENSOR:
 272                 int3403_sensor_remove(priv);
 273                 break;
 274         case INT3403_TYPE_CHARGER:
 275         case INT3403_TYPE_BATTERY:
 276                 int3403_cdev_remove(priv);
 277                 break;
 278         default:
 279                 break;
 280         }
 281
 282         return 0;
 283 }
 284
 285 static const struct acpi_device_id int3403_device_ids[] = {
 286         {"INT3403", 0},
 287         {"", 0},
 288 };
 289 MODULE_DEVICE_TABLE(acpi, int3403_device_ids);
 290
 291 static struct platform_driver int3403_driver = {
 292         .probe = int3403_add,
 293         .remove = int3403_remove,
 294         .driver = {
 295                 .name = "int3403 thermal",
 296                 .acpi_match_table = int3403_device_ids,
 297         },
 298 };
 299
 300 module_platform_driver(int3403_driver);
 301
 302 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
 303 MODULE_LICENSE("GPL v2");
 304 MODULE_DESCRIPTION("ACPI INT3403 thermal driver");