drivers/thermal/int340x_thermal/int3400_thermal.c

   1 /*
   2  * INT3400 thermal driver
   3  *
   4  * Copyright (C) 2014, Intel Corporation
   5  * Authors: Zhang Rui <rui.zhang@intel.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  *
  11  */
  12
  13 #include <linux/module.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/acpi.h>
  16 #include <linux/thermal.h>
  17 #include "acpi_thermal_rel.h"
  18
  19 enum int3400_thermal_uuid {
  20         INT3400_THERMAL_PASSIVE_1,
  21         INT3400_THERMAL_PASSIVE_2,
  22         INT3400_THERMAL_ACTIVE,
  23         INT3400_THERMAL_CRITICAL,
  24         INT3400_THERMAL_COOLING_MODE,
  25         INT3400_THERMAL_MAXIMUM_UUID,
  26 };
  27
  28 static u8 *int3400_thermal_uuids[INT3400_THERMAL_MAXIMUM_UUID] = {
  29         "42A441D6-AE6A-462b-A84B-4A8CE79027D3",
  30         "9E04115A-AE87-4D1C-9500-0F3E340BFE75",
  31         "3A95C389-E4B8-4629-A526-C52C88626BAE",
  32         "97C68AE7-15FA-499c-B8C9-5DA81D606E0A",
  33         "16CAF1B7-DD38-40ed-B1C1-1B8A1913D531",
  34 };
  35
  36 struct int3400_thermal_priv {
  37         struct acpi_device *adev;
  38         struct thermal_zone_device *thermal;
  39         int mode;
  40         int art_count;
  41         struct art *arts;
  42         int trt_count;
  43         struct trt *trts;
  44         u8 uuid_bitmap;
  45         int rel_misc_dev_res;
  46         int current_uuid_index;
  47 };
  48
  49 static ssize_t available_uuids_show(struct device *dev,
  50                                     struct device_attribute *attr,
  51                                     char *buf)
  52 {
  53         struct platform_device *pdev = to_platform_device(dev);
  54         struct int3400_thermal_priv *priv = platform_get_drvdata(pdev);
  55         int i;
  56         int length = 0;
  57
  58         for (i = 0; i < INT3400_THERMAL_MAXIMUM_UUID; i++) {
  59                 if (priv->uuid_bitmap & (1 << i))
  60                         if (PAGE_SIZE - length > 0)
  61                                 length += snprintf(&buf[length],
  62                                                    PAGE_SIZE - length,
  63                                                    "%s\n",
  64                                                    int3400_thermal_uuids[i]);
  65         }
  66
  67         return length;
  68 }
  69
  70 static ssize_t current_uuid_show(struct device *dev,
  71                                  struct device_attribute *devattr, char *buf)
  72 {
  73         struct platform_device *pdev = to_platform_device(dev);
  74         struct int3400_thermal_priv *priv = platform_get_drvdata(pdev);
  75
  76         if (priv->uuid_bitmap & (1 << priv->current_uuid_index))
  77                 return sprintf(buf, "%s\n",
  78                                int3400_thermal_uuids[priv->current_uuid_index]);
  79         else
  80                 return sprintf(buf, "INVALID\n");
  81 }
  82
  83 static ssize_t current_uuid_store(struct device *dev,
  84                                   struct device_attribute *attr,
  85                                   const char *buf, size_t count)
  86 {
  87         struct platform_device *pdev = to_platform_device(dev);
  88         struct int3400_thermal_priv *priv = platform_get_drvdata(pdev);
  89         int i;
  90
  91         for (i = 0; i < INT3400_THERMAL_MAXIMUM_UUID; ++i) {
  92                 if ((priv->uuid_bitmap & (1 << i)) &&
  93                     !(strncmp(buf, int3400_thermal_uuids[i],
  94                               sizeof(int3400_thermal_uuids[i]) - 1))) {
  95                         priv->current_uuid_index = i;
  96                         return count;
  97                 }
  98         }
  99
 100         return -EINVAL;
 101 }
 102
 103 static DEVICE_ATTR(current_uuid, 0644, current_uuid_show, current_uuid_store);
 104 static DEVICE_ATTR_RO(available_uuids);
 105 static struct attribute *uuid_attrs[] = {
 106         &dev_attr_available_uuids.attr,
 107         &dev_attr_current_uuid.attr,
 108         NULL
 109 };
 110
 111 static struct attribute_group uuid_attribute_group = {
 112         .attrs = uuid_attrs,
 113         .name = "uuids"
 114 };
 115
 116 static int int3400_thermal_get_uuids(struct int3400_thermal_priv *priv)
 117 {
 118         struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL};
 119         union acpi_object *obja, *objb;
 120         int i, j;
 121         int result = 0;
 122         acpi_status status;
 123
 124         status = acpi_evaluate_object(priv->adev->handle, "IDSP", NULL, &buf);
 125         if (ACPI_FAILURE(status))
 126                 return -ENODEV;
 127
 128         obja = (union acpi_object *)buf.pointer;
 129         if (obja->type != ACPI_TYPE_PACKAGE) {
 130                 result = -EINVAL;
 131                 goto end;
 132         }
 133
 134         for (i = 0; i < obja->package.count; i++) {
 135                 objb = &obja->package.elements[i];
 136                 if (objb->type != ACPI_TYPE_BUFFER) {
 137                         result = -EINVAL;
 138                         goto end;
 139                 }
 140
 141                 /* UUID must be 16 bytes */
 142                 if (objb->buffer.length != 16) {
 143                         result = -EINVAL;
 144                         goto end;
 145                 }
 146
 147                 for (j = 0; j < INT3400_THERMAL_MAXIMUM_UUID; j++) {
 148                         u8 uuid[16];
 149
 150                         acpi_str_to_uuid(int3400_thermal_uuids[j], uuid);
 151                         if (!strncmp(uuid, objb->buffer.pointer, 16)) {
 152                                 priv->uuid_bitmap |= (1 << j);
 153                                 break;
 154                         }
 155                 }
 156         }
 157
 158 end:
 159         kfree(buf.pointer);
 160         return result;
 161 }
 162
 163 static int int3400_thermal_run_osc(acpi_handle handle,
 164                                 enum int3400_thermal_uuid uuid, bool enable)
 165 {
 166         u32 ret, buf[2];
 167         acpi_status status;
 168         int result = 0;
 169         struct acpi_osc_context context = {
 170                 .uuid_str = int3400_thermal_uuids[uuid],
 171                 .rev = 1,
 172                 .cap.length = 8,
 173         };
 174
 175         buf[OSC_QUERY_DWORD] = 0;
 176         buf[OSC_SUPPORT_DWORD] = enable;
 177
 178         context.cap.pointer = buf;
 179
 180         status = acpi_run_osc(handle, &context);
 181         if (ACPI_SUCCESS(status)) {
 182                 ret = *((u32 *)(context.ret.pointer + 4));
 183                 if (ret != enable)
 184                         result = -EPERM;
 185         } else
 186                 result = -EPERM;
 187
 188         kfree(context.ret.pointer);
 189         return result;
 190 }
 191
 192 static int int3400_thermal_get_temp(struct thermal_zone_device *thermal,
 193                         unsigned long *temp)
 194 {
 195         *temp = 20 * 1000; /* faked temp sensor with 20C */
 196         return 0;
 197 }
 198
 199 static int int3400_thermal_get_mode(struct thermal_zone_device *thermal,
 200                                 enum thermal_device_mode *mode)
 201 {
 202         struct int3400_thermal_priv *priv = thermal->devdata;
 203
 204         if (!priv)
 205                 return -EINVAL;
 206
 207         *mode = priv->mode;
 208
 209         return 0;
 210 }
 211
 212 static int int3400_thermal_set_mode(struct thermal_zone_device *thermal,
 213                                 enum thermal_device_mode mode)
 214 {
 215         struct int3400_thermal_priv *priv = thermal->devdata;
 216         bool enable;
 217         int result = 0;
 218
 219         if (!priv)
 220                 return -EINVAL;
 221
 222         if (mode == THERMAL_DEVICE_ENABLED)
 223                 enable = true;
 224         else if (mode == THERMAL_DEVICE_DISABLED)
 225                 enable = false;
 226         else
 227                 return -EINVAL;
 228
 229         if (enable != priv->mode) {
 230                 priv->mode = enable;
 231                 result = int3400_thermal_run_osc(priv->adev->handle,
 232                                                  priv->current_uuid_index,
 233                                                  enable);
 234         }
 235         return result;
 236 }
 237
 238 static struct thermal_zone_device_ops int3400_thermal_ops = {
 239         .get_temp = int3400_thermal_get_temp,
 240 };
 241
 242 static struct thermal_zone_params int3400_thermal_params = {
 243         .governor_name = "user_space",
 244         .no_hwmon = true,
 245 };
 246
 247 static int int3400_thermal_probe(struct platform_device *pdev)
 248 {
 249         struct acpi_device *adev = ACPI_COMPANION(&pdev->dev);
 250         struct int3400_thermal_priv *priv;
 251         int result;
 252
 253         if (!adev)
 254                 return -ENODEV;
 255
 256         priv = kzalloc(sizeof(struct int3400_thermal_priv), GFP_KERNEL);
 257         if (!priv)
 258                 return -ENOMEM;
 259
 260         priv->adev = adev;
 261
 262         result = int3400_thermal_get_uuids(priv);
 263         if (result)
 264                 goto free_priv;
 265
 266         result = acpi_parse_art(priv->adev->handle, &priv->art_count,
 267                                 &priv->arts, true);
 268         if (result)
 269                 goto free_priv;
 270
 271
 272         result = acpi_parse_trt(priv->adev->handle, &priv->trt_count,
 273                                 &priv->trts, true);
 274         if (result)
 275                 goto free_art;
 276
 277         platform_set_drvdata(pdev, priv);
 278
 279         if (priv->uuid_bitmap & 1 << INT3400_THERMAL_PASSIVE_1) {
 280                 int3400_thermal_ops.get_mode = int3400_thermal_get_mode;
 281                 int3400_thermal_ops.set_mode = int3400_thermal_set_mode;
 282         }
 283         priv->thermal = thermal_zone_device_register("INT3400 Thermal", 0, 0,
 284                                                 priv, &int3400_thermal_ops,
 285                                                 &int3400_thermal_params, 0, 0);
 286         if (IS_ERR(priv->thermal)) {
 287                 result = PTR_ERR(priv->thermal);
 288                 goto free_trt;
 289         }
 290
 291         priv->rel_misc_dev_res = acpi_thermal_rel_misc_device_add(
 292                                                         priv->adev->handle);
 293
 294         result = sysfs_create_group(&pdev->dev.kobj, &uuid_attribute_group);
 295         if (result)
 296                 goto free_zone;
 297
 298         return 0;
 299
 300 free_zone:
 301         thermal_zone_device_unregister(priv->thermal);
 302 free_trt:
 303         kfree(priv->trts);
 304 free_art:
 305         kfree(priv->arts);
 306 free_priv:
 307         kfree(priv);
 308         return result;
 309 }
 310
 311 static int int3400_thermal_remove(struct platform_device *pdev)
 312 {
 313         struct int3400_thermal_priv *priv = platform_get_drvdata(pdev);
 314
 315         if (!priv->rel_misc_dev_res)
 316                 acpi_thermal_rel_misc_device_remove(priv->adev->handle);
 317
 318         sysfs_remove_group(&pdev->dev.kobj, &uuid_attribute_group);
 319         thermal_zone_device_unregister(priv->thermal);
 320         kfree(priv->trts);
 321         kfree(priv->arts);
 322         kfree(priv);
 323         return 0;
 324 }
 325
 326 static const struct acpi_device_id int3400_thermal_match[] = {
 327         {"INT3400", 0},
 328         {}
 329 };
 330
 331 MODULE_DEVICE_TABLE(acpi, int3400_thermal_match);
 332
 333 static struct platform_driver int3400_thermal_driver = {
 334         .probe = int3400_thermal_probe,
 335         .remove = int3400_thermal_remove,
 336         .driver = {
 337                    .name = "int3400 thermal",
 338                    .acpi_match_table = ACPI_PTR(int3400_thermal_match),
 339                    },
 340 };
 341
 342 module_platform_driver(int3400_thermal_driver);
 343
 344 MODULE_DESCRIPTION("INT3400 Thermal driver");
 345 MODULE_AUTHOR("Zhang Rui <rui.zhang@intel.com>");
 346 MODULE_LICENSE("GPL");