drivers/thermal/intel/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 #define INT3400_THERMAL_TABLE_CHANGED 0x83
  20
  21 enum int3400_thermal_uuid {
  22         INT3400_THERMAL_PASSIVE_1,
  23         INT3400_THERMAL_ACTIVE,
  24         INT3400_THERMAL_CRITICAL,
  25         INT3400_THERMAL_MAXIMUM_UUID,
  26 };
  27
  28 static char *int3400_thermal_uuids[INT3400_THERMAL_MAXIMUM_UUID] = {
  29         "42A441D6-AE6A-462b-A84B-4A8CE79027D3",
  30         "3A95C389-E4B8-4629-A526-C52C88626BAE",
  31         "97C68AE7-15FA-499c-B8C9-5DA81D606E0A",
  32 };
  33
  34 struct int3400_thermal_priv {
  35         struct acpi_device *adev;
  36         struct thermal_zone_device *thermal;
  37         int mode;
  38         int art_count;
  39         struct art *arts;
  40         int trt_count;
  41         struct trt *trts;
  42         u8 uuid_bitmap;
  43         int rel_misc_dev_res;
  44         int current_uuid_index;
  45 };
  46
  47 static ssize_t available_uuids_show(struct device *dev,
  48                                     struct device_attribute *attr,
  49                                     char *buf)
  50 {
  51         struct int3400_thermal_priv *priv = dev_get_drvdata(dev);
  52         int i;
  53         int length = 0;
  54
  55         for (i = 0; i < INT3400_THERMAL_MAXIMUM_UUID; i++) {
  56                 if (priv->uuid_bitmap & (1 << i))
  57                         if (PAGE_SIZE - length > 0)
  58                                 length += snprintf(&buf[length],
  59                                                    PAGE_SIZE - length,
  60                                                    "%s\n",
  61                                                    int3400_thermal_uuids[i]);
  62         }
  63
  64         return length;
  65 }
  66
  67 static ssize_t current_uuid_show(struct device *dev,
  68                                  struct device_attribute *devattr, char *buf)
  69 {
  70         struct int3400_thermal_priv *priv = dev_get_drvdata(dev);
  71
  72         if (priv->uuid_bitmap & (1 << priv->current_uuid_index))
  73                 return sprintf(buf, "%s\n",
  74                                int3400_thermal_uuids[priv->current_uuid_index]);
  75         else
  76                 return sprintf(buf, "INVALID\n");
  77 }
  78
  79 static ssize_t current_uuid_store(struct device *dev,
  80                                   struct device_attribute *attr,
  81                                   const char *buf, size_t count)
  82 {
  83         struct int3400_thermal_priv *priv = dev_get_drvdata(dev);
  84         int i;
  85
  86         for (i = 0; i < INT3400_THERMAL_MAXIMUM_UUID; ++i) {
  87                 if ((priv->uuid_bitmap & (1 << i)) &&
  88                     !(strncmp(buf, int3400_thermal_uuids[i],
  89                               sizeof(int3400_thermal_uuids[i]) - 1))) {
  90                         priv->current_uuid_index = i;
  91                         return count;
  92                 }
  93         }
  94
  95         return -EINVAL;
  96 }
  97
  98 static DEVICE_ATTR_RW(current_uuid);
  99 static DEVICE_ATTR_RO(available_uuids);
 100 static struct attribute *uuid_attrs[] = {
 101         &dev_attr_available_uuids.attr,
 102         &dev_attr_current_uuid.attr,
 103         NULL
 104 };
 105
 106 static const struct attribute_group uuid_attribute_group = {
 107         .attrs = uuid_attrs,
 108         .name = "uuids"
 109 };
 110
 111 static int int3400_thermal_get_uuids(struct int3400_thermal_priv *priv)
 112 {
 113         struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL};
 114         union acpi_object *obja, *objb;
 115         int i, j;
 116         int result = 0;
 117         acpi_status status;
 118
 119         status = acpi_evaluate_object(priv->adev->handle, "IDSP", NULL, &buf);
 120         if (ACPI_FAILURE(status))
 121                 return -ENODEV;
 122
 123         obja = (union acpi_object *)buf.pointer;
 124         if (obja->type != ACPI_TYPE_PACKAGE) {
 125                 result = -EINVAL;
 126                 goto end;
 127         }
 128
 129         for (i = 0; i < obja->package.count; i++) {
 130                 objb = &obja->package.elements[i];
 131                 if (objb->type != ACPI_TYPE_BUFFER) {
 132                         result = -EINVAL;
 133                         goto end;
 134                 }
 135
 136                 /* UUID must be 16 bytes */
 137                 if (objb->buffer.length != 16) {
 138                         result = -EINVAL;
 139                         goto end;
 140                 }
 141
 142                 for (j = 0; j < INT3400_THERMAL_MAXIMUM_UUID; j++) {
 143                         guid_t guid;
 144
 145                         guid_parse(int3400_thermal_uuids[j], &guid);
 146                         if (guid_equal((guid_t *)objb->buffer.pointer, &guid)) {
 147                                 priv->uuid_bitmap |= (1 << j);
 148                                 break;
 149                         }
 150                 }
 151         }
 152
 153 end:
 154         kfree(buf.pointer);
 155         return result;
 156 }
 157
 158 static int int3400_thermal_run_osc(acpi_handle handle,
 159                                 enum int3400_thermal_uuid uuid, bool enable)
 160 {
 161         u32 ret, buf[2];
 162         acpi_status status;
 163         int result = 0;
 164         struct acpi_osc_context context = {
 165                 .uuid_str = int3400_thermal_uuids[uuid],
 166                 .rev = 1,
 167                 .cap.length = 8,
 168         };
 169
 170         buf[OSC_QUERY_DWORD] = 0;
 171         buf[OSC_SUPPORT_DWORD] = enable;
 172
 173         context.cap.pointer = buf;
 174
 175         status = acpi_run_osc(handle, &context);
 176         if (ACPI_SUCCESS(status)) {
 177                 ret = *((u32 *)(context.ret.pointer + 4));
 178                 if (ret != enable)
 179                         result = -EPERM;
 180         } else
 181                 result = -EPERM;
 182
 183         kfree(context.ret.pointer);
 184         return result;
 185 }
 186
 187 static void int3400_notify(acpi_handle handle,
 188                         u32 event,
 189                         void *data)
 190 {
 191         struct int3400_thermal_priv *priv = data;
 192         char *thermal_prop[5];
 193
 194         if (!priv)
 195                 return;
 196
 197         switch (event) {
 198         case INT3400_THERMAL_TABLE_CHANGED:
 199                 thermal_prop[0] = kasprintf(GFP_KERNEL, "NAME=%s",
 200                                 priv->thermal->type);
 201                 thermal_prop[1] = kasprintf(GFP_KERNEL, "TEMP=%d",
 202                                 priv->thermal->temperature);
 203                 thermal_prop[2] = kasprintf(GFP_KERNEL, "TRIP=");
 204                 thermal_prop[3] = kasprintf(GFP_KERNEL, "EVENT=%d",
 205                                 THERMAL_TABLE_CHANGED);
 206                 thermal_prop[4] = NULL;
 207                 kobject_uevent_env(&priv->thermal->device.kobj, KOBJ_CHANGE,
 208                                 thermal_prop);
 209                 break;
 210         default:
 211                 /* Ignore unknown notification codes sent to INT3400 device */
 212                 break;
 213         }
 214 }
 215
 216 static int int3400_thermal_get_temp(struct thermal_zone_device *thermal,
 217                         int *temp)
 218 {
 219         *temp = 20 * 1000; /* faked temp sensor with 20C */
 220         return 0;
 221 }
 222
 223 static int int3400_thermal_get_mode(struct thermal_zone_device *thermal,
 224                                 enum thermal_device_mode *mode)
 225 {
 226         struct int3400_thermal_priv *priv = thermal->devdata;
 227
 228         if (!priv)
 229                 return -EINVAL;
 230
 231         *mode = priv->mode;
 232
 233         return 0;
 234 }
 235
 236 static int int3400_thermal_set_mode(struct thermal_zone_device *thermal,
 237                                 enum thermal_device_mode mode)
 238 {
 239         struct int3400_thermal_priv *priv = thermal->devdata;
 240         bool enable;
 241         int result = 0;
 242
 243         if (!priv)
 244                 return -EINVAL;
 245
 246         if (mode == THERMAL_DEVICE_ENABLED)
 247                 enable = true;
 248         else if (mode == THERMAL_DEVICE_DISABLED)
 249                 enable = false;
 250         else
 251                 return -EINVAL;
 252
 253         if (enable != priv->mode) {
 254                 priv->mode = enable;
 255                 result = int3400_thermal_run_osc(priv->adev->handle,
 256                                                  priv->current_uuid_index,
 257                                                  enable);
 258         }
 259         return result;
 260 }
 261
 262 static struct thermal_zone_device_ops int3400_thermal_ops = {
 263         .get_temp = int3400_thermal_get_temp,
 264 };
 265
 266 static struct thermal_zone_params int3400_thermal_params = {
 267         .governor_name = "user_space",
 268         .no_hwmon = true,
 269 };
 270
 271 static int int3400_thermal_probe(struct platform_device *pdev)
 272 {
 273         struct acpi_device *adev = ACPI_COMPANION(&pdev->dev);
 274         struct int3400_thermal_priv *priv;
 275         int result;
 276
 277         if (!adev)
 278                 return -ENODEV;
 279
 280         priv = kzalloc(sizeof(struct int3400_thermal_priv), GFP_KERNEL);
 281         if (!priv)
 282                 return -ENOMEM;
 283
 284         priv->adev = adev;
 285
 286         result = int3400_thermal_get_uuids(priv);
 287         if (result)
 288                 goto free_priv;
 289
 290         result = acpi_parse_art(priv->adev->handle, &priv->art_count,
 291                                 &priv->arts, true);
 292         if (result)
 293                 dev_dbg(&pdev->dev, "_ART table parsing error\n");
 294
 295         result = acpi_parse_trt(priv->adev->handle, &priv->trt_count,
 296                                 &priv->trts, true);
 297         if (result)
 298                 dev_dbg(&pdev->dev, "_TRT table parsing error\n");
 299
 300         platform_set_drvdata(pdev, priv);
 301
 302         if (priv->uuid_bitmap & 1 << INT3400_THERMAL_PASSIVE_1) {
 303                 int3400_thermal_ops.get_mode = int3400_thermal_get_mode;
 304                 int3400_thermal_ops.set_mode = int3400_thermal_set_mode;
 305         }
 306         priv->thermal = thermal_zone_device_register("INT3400 Thermal", 0, 0,
 307                                                 priv, &int3400_thermal_ops,
 308                                                 &int3400_thermal_params, 0, 0);
 309         if (IS_ERR(priv->thermal)) {
 310                 result = PTR_ERR(priv->thermal);
 311                 goto free_art_trt;
 312         }
 313
 314         priv->rel_misc_dev_res = acpi_thermal_rel_misc_device_add(
 315                                                         priv->adev->handle);
 316
 317         result = sysfs_create_group(&pdev->dev.kobj, &uuid_attribute_group);
 318         if (result)
 319                 goto free_rel_misc;
 320
 321         result = acpi_install_notify_handler(
 322                         priv->adev->handle, ACPI_DEVICE_NOTIFY, int3400_notify,
 323                         (void *)priv);
 324         if (result)
 325                 goto free_sysfs;
 326
 327         return 0;
 328
 329 free_sysfs:
 330         sysfs_remove_group(&pdev->dev.kobj, &uuid_attribute_group);
 331 free_rel_misc:
 332         if (!priv->rel_misc_dev_res)
 333                 acpi_thermal_rel_misc_device_remove(priv->adev->handle);
 334         thermal_zone_device_unregister(priv->thermal);
 335 free_art_trt:
 336         kfree(priv->trts);
 337         kfree(priv->arts);
 338 free_priv:
 339         kfree(priv);
 340         return result;
 341 }
 342
 343 static int int3400_thermal_remove(struct platform_device *pdev)
 344 {
 345         struct int3400_thermal_priv *priv = platform_get_drvdata(pdev);
 346
 347         acpi_remove_notify_handler(
 348                         priv->adev->handle, ACPI_DEVICE_NOTIFY,
 349                         int3400_notify);
 350
 351         if (!priv->rel_misc_dev_res)
 352                 acpi_thermal_rel_misc_device_remove(priv->adev->handle);
 353
 354         sysfs_remove_group(&pdev->dev.kobj, &uuid_attribute_group);
 355         thermal_zone_device_unregister(priv->thermal);
 356         kfree(priv->trts);
 357         kfree(priv->arts);
 358         kfree(priv);
 359         return 0;
 360 }
 361
 362 static const struct acpi_device_id int3400_thermal_match[] = {
 363         {"INT3400", 0},
 364         {}
 365 };
 366
 367 MODULE_DEVICE_TABLE(acpi, int3400_thermal_match);
 368
 369 static struct platform_driver int3400_thermal_driver = {
 370         .probe = int3400_thermal_probe,
 371         .remove = int3400_thermal_remove,
 372         .driver = {
 373                    .name = "int3400 thermal",
 374                    .acpi_match_table = ACPI_PTR(int3400_thermal_match),
 375                    },
 376 };
 377
 378 module_platform_driver(int3400_thermal_driver);
 379
 380 MODULE_DESCRIPTION("INT3400 Thermal driver");
 381 MODULE_AUTHOR("Zhang Rui <rui.zhang@intel.com>");
 382 MODULE_LICENSE("GPL");