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_ADAPTIVE_PERFORMANCE,
  26         INT3400_THERMAL_EMERGENCY_CALL_MODE,
  27         INT3400_THERMAL_PASSIVE_2,
  28         INT3400_THERMAL_POWER_BOSS,
  29         INT3400_THERMAL_VIRTUAL_SENSOR,
  30         INT3400_THERMAL_COOLING_MODE,
  31         INT3400_THERMAL_HARDWARE_DUTY_CYCLING,
  32         INT3400_THERMAL_MAXIMUM_UUID,
  33 };
  34
  35 static char *int3400_thermal_uuids[INT3400_THERMAL_MAXIMUM_UUID] = {
  36         "42A441D6-AE6A-462b-A84B-4A8CE79027D3",
  37         "3A95C389-E4B8-4629-A526-C52C88626BAE",
  38         "97C68AE7-15FA-499c-B8C9-5DA81D606E0A",
  39         "63BE270F-1C11-48FD-A6F7-3AF253FF3E2D",
  40         "5349962F-71E6-431D-9AE8-0A635B710AEE",
  41         "9E04115A-AE87-4D1C-9500-0F3E340BFE75",
  42         "F5A35014-C209-46A4-993A-EB56DE7530A1",
  43         "6ED722A7-9240-48A5-B479-31EEF723D7CF",
  44         "16CAF1B7-DD38-40ED-B1C1-1B8A1913D531",
  45         "BE84BABF-C4D4-403D-B495-3128FD44dAC1",
  46 };
  47
  48 struct int3400_thermal_priv {
  49         struct acpi_device *adev;
  50         struct thermal_zone_device *thermal;
  51         int mode;
  52         int art_count;
  53         struct art *arts;
  54         int trt_count;
  55         struct trt *trts;
  56         u8 uuid_bitmap;
  57         int rel_misc_dev_res;
  58         int current_uuid_index;
  59 };
  60
  61 static ssize_t available_uuids_show(struct device *dev,
  62                                     struct device_attribute *attr,
  63                                     char *buf)
  64 {
  65         struct int3400_thermal_priv *priv = dev_get_drvdata(dev);
  66         int i;
  67         int length = 0;
  68
  69         for (i = 0; i < INT3400_THERMAL_MAXIMUM_UUID; i++) {
  70                 if (priv->uuid_bitmap & (1 << i))
  71                         if (PAGE_SIZE - length > 0)
  72                                 length += snprintf(&buf[length],
  73                                                    PAGE_SIZE - length,
  74                                                    "%s\n",
  75                                                    int3400_thermal_uuids[i]);
  76         }
  77
  78         return length;
  79 }
  80
  81 static ssize_t current_uuid_show(struct device *dev,
  82                                  struct device_attribute *devattr, char *buf)
  83 {
  84         struct int3400_thermal_priv *priv = dev_get_drvdata(dev);
  85
  86         if (priv->uuid_bitmap & (1 << priv->current_uuid_index))
  87                 return sprintf(buf, "%s\n",
  88                                int3400_thermal_uuids[priv->current_uuid_index]);
  89         else
  90                 return sprintf(buf, "INVALID\n");
  91 }
  92
  93 static ssize_t current_uuid_store(struct device *dev,
  94                                   struct device_attribute *attr,
  95                                   const char *buf, size_t count)
  96 {
  97         struct int3400_thermal_priv *priv = dev_get_drvdata(dev);
  98         int i;
  99
 100         for (i = 0; i < INT3400_THERMAL_MAXIMUM_UUID; ++i) {
 101                 if ((priv->uuid_bitmap & (1 << i)) &&
 102                     !(strncmp(buf, int3400_thermal_uuids[i],
 103                               sizeof(int3400_thermal_uuids[i]) - 1))) {
 104                         priv->current_uuid_index = i;
 105                         return count;
 106                 }
 107         }
 108
 109         return -EINVAL;
 110 }
 111
 112 static DEVICE_ATTR_RW(current_uuid);
 113 static DEVICE_ATTR_RO(available_uuids);
 114 static struct attribute *uuid_attrs[] = {
 115         &dev_attr_available_uuids.attr,
 116         &dev_attr_current_uuid.attr,
 117         NULL
 118 };
 119
 120 static const struct attribute_group uuid_attribute_group = {
 121         .attrs = uuid_attrs,
 122         .name = "uuids"
 123 };
 124
 125 static int int3400_thermal_get_uuids(struct int3400_thermal_priv *priv)
 126 {
 127         struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL};
 128         union acpi_object *obja, *objb;
 129         int i, j;
 130         int result = 0;
 131         acpi_status status;
 132
 133         status = acpi_evaluate_object(priv->adev->handle, "IDSP", NULL, &buf);
 134         if (ACPI_FAILURE(status))
 135                 return -ENODEV;
 136
 137         obja = (union acpi_object *)buf.pointer;
 138         if (obja->type != ACPI_TYPE_PACKAGE) {
 139                 result = -EINVAL;
 140                 goto end;
 141         }
 142
 143         for (i = 0; i < obja->package.count; i++) {
 144                 objb = &obja->package.elements[i];
 145                 if (objb->type != ACPI_TYPE_BUFFER) {
 146                         result = -EINVAL;
 147                         goto end;
 148                 }
 149
 150                 /* UUID must be 16 bytes */
 151                 if (objb->buffer.length != 16) {
 152                         result = -EINVAL;
 153                         goto end;
 154                 }
 155
 156                 for (j = 0; j < INT3400_THERMAL_MAXIMUM_UUID; j++) {
 157                         guid_t guid;
 158
 159                         guid_parse(int3400_thermal_uuids[j], &guid);
 160                         if (guid_equal((guid_t *)objb->buffer.pointer, &guid)) {
 161                                 priv->uuid_bitmap |= (1 << j);
 162                                 break;
 163                         }
 164                 }
 165         }
 166
 167 end:
 168         kfree(buf.pointer);
 169         return result;
 170 }
 171
 172 static int int3400_thermal_run_osc(acpi_handle handle,
 173                                 enum int3400_thermal_uuid uuid, bool enable)
 174 {
 175         u32 ret, buf[2];
 176         acpi_status status;
 177         int result = 0;
 178         struct acpi_osc_context context = {
 179                 .uuid_str = int3400_thermal_uuids[uuid],
 180                 .rev = 1,
 181                 .cap.length = 8,
 182         };
 183
 184         buf[OSC_QUERY_DWORD] = 0;
 185         buf[OSC_SUPPORT_DWORD] = enable;
 186
 187         context.cap.pointer = buf;
 188
 189         status = acpi_run_osc(handle, &context);
 190         if (ACPI_SUCCESS(status)) {
 191                 ret = *((u32 *)(context.ret.pointer + 4));
 192                 if (ret != enable)
 193                         result = -EPERM;
 194         } else
 195                 result = -EPERM;
 196
 197         kfree(context.ret.pointer);
 198         return result;
 199 }
 200
 201 static void int3400_notify(acpi_handle handle,
 202                         u32 event,
 203                         void *data)
 204 {
 205         struct int3400_thermal_priv *priv = data;
 206         char *thermal_prop[5];
 207
 208         if (!priv)
 209                 return;
 210
 211         switch (event) {
 212         case INT3400_THERMAL_TABLE_CHANGED:
 213                 thermal_prop[0] = kasprintf(GFP_KERNEL, "NAME=%s",
 214                                 priv->thermal->type);
 215                 thermal_prop[1] = kasprintf(GFP_KERNEL, "TEMP=%d",
 216                                 priv->thermal->temperature);
 217                 thermal_prop[2] = kasprintf(GFP_KERNEL, "TRIP=");
 218                 thermal_prop[3] = kasprintf(GFP_KERNEL, "EVENT=%d",
 219                                 THERMAL_TABLE_CHANGED);
 220                 thermal_prop[4] = NULL;
 221                 kobject_uevent_env(&priv->thermal->device.kobj, KOBJ_CHANGE,
 222                                 thermal_prop);
 223                 break;
 224         default:
 225                 /* Ignore unknown notification codes sent to INT3400 device */
 226                 break;
 227         }
 228 }
 229
 230 static int int3400_thermal_get_temp(struct thermal_zone_device *thermal,
 231                         int *temp)
 232 {
 233         *temp = 20 * 1000; /* faked temp sensor with 20C */
 234         return 0;
 235 }
 236
 237 static int int3400_thermal_get_mode(struct thermal_zone_device *thermal,
 238                                 enum thermal_device_mode *mode)
 239 {
 240         struct int3400_thermal_priv *priv = thermal->devdata;
 241
 242         if (!priv)
 243                 return -EINVAL;
 244
 245         *mode = priv->mode;
 246
 247         return 0;
 248 }
 249
 250 static int int3400_thermal_set_mode(struct thermal_zone_device *thermal,
 251                                 enum thermal_device_mode mode)
 252 {
 253         struct int3400_thermal_priv *priv = thermal->devdata;
 254         bool enable;
 255         int result = 0;
 256
 257         if (!priv)
 258                 return -EINVAL;
 259
 260         if (mode == THERMAL_DEVICE_ENABLED)
 261                 enable = true;
 262         else if (mode == THERMAL_DEVICE_DISABLED)
 263                 enable = false;
 264         else
 265                 return -EINVAL;
 266
 267         if (enable != priv->mode) {
 268                 priv->mode = enable;
 269                 result = int3400_thermal_run_osc(priv->adev->handle,
 270                                                  priv->current_uuid_index,
 271                                                  enable);
 272         }
 273         return result;
 274 }
 275
 276 static struct thermal_zone_device_ops int3400_thermal_ops = {
 277         .get_temp = int3400_thermal_get_temp,
 278 };
 279
 280 static struct thermal_zone_params int3400_thermal_params = {
 281         .governor_name = "user_space",
 282         .no_hwmon = true,
 283 };
 284
 285 static int int3400_thermal_probe(struct platform_device *pdev)
 286 {
 287         struct acpi_device *adev = ACPI_COMPANION(&pdev->dev);
 288         struct int3400_thermal_priv *priv;
 289         int result;
 290
 291         if (!adev)
 292                 return -ENODEV;
 293
 294         priv = kzalloc(sizeof(struct int3400_thermal_priv), GFP_KERNEL);
 295         if (!priv)
 296                 return -ENOMEM;
 297
 298         priv->adev = adev;
 299
 300         result = int3400_thermal_get_uuids(priv);
 301         if (result)
 302                 goto free_priv;
 303
 304         result = acpi_parse_art(priv->adev->handle, &priv->art_count,
 305                                 &priv->arts, true);
 306         if (result)
 307                 dev_dbg(&pdev->dev, "_ART table parsing error\n");
 308
 309         result = acpi_parse_trt(priv->adev->handle, &priv->trt_count,
 310                                 &priv->trts, true);
 311         if (result)
 312                 dev_dbg(&pdev->dev, "_TRT table parsing error\n");
 313
 314         platform_set_drvdata(pdev, priv);
 315
 316         int3400_thermal_ops.get_mode = int3400_thermal_get_mode;
 317         int3400_thermal_ops.set_mode = int3400_thermal_set_mode;
 318
 319         priv->thermal = thermal_zone_device_register("INT3400 Thermal", 0, 0,
 320                                                 priv, &int3400_thermal_ops,
 321                                                 &int3400_thermal_params, 0, 0);
 322         if (IS_ERR(priv->thermal)) {
 323                 result = PTR_ERR(priv->thermal);
 324                 goto free_art_trt;
 325         }
 326
 327         priv->rel_misc_dev_res = acpi_thermal_rel_misc_device_add(
 328                                                         priv->adev->handle);
 329
 330         result = sysfs_create_group(&pdev->dev.kobj, &uuid_attribute_group);
 331         if (result)
 332                 goto free_rel_misc;
 333
 334         result = acpi_install_notify_handler(
 335                         priv->adev->handle, ACPI_DEVICE_NOTIFY, int3400_notify,
 336                         (void *)priv);
 337         if (result)
 338                 goto free_sysfs;
 339
 340         return 0;
 341
 342 free_sysfs:
 343         sysfs_remove_group(&pdev->dev.kobj, &uuid_attribute_group);
 344 free_rel_misc:
 345         if (!priv->rel_misc_dev_res)
 346                 acpi_thermal_rel_misc_device_remove(priv->adev->handle);
 347         thermal_zone_device_unregister(priv->thermal);
 348 free_art_trt:
 349         kfree(priv->trts);
 350         kfree(priv->arts);
 351 free_priv:
 352         kfree(priv);
 353         return result;
 354 }
 355
 356 static int int3400_thermal_remove(struct platform_device *pdev)
 357 {
 358         struct int3400_thermal_priv *priv = platform_get_drvdata(pdev);
 359
 360         acpi_remove_notify_handler(
 361                         priv->adev->handle, ACPI_DEVICE_NOTIFY,
 362                         int3400_notify);
 363
 364         if (!priv->rel_misc_dev_res)
 365                 acpi_thermal_rel_misc_device_remove(priv->adev->handle);
 366
 367         sysfs_remove_group(&pdev->dev.kobj, &uuid_attribute_group);
 368         thermal_zone_device_unregister(priv->thermal);
 369         kfree(priv->trts);
 370         kfree(priv->arts);
 371         kfree(priv);
 372         return 0;
 373 }
 374
 375 static const struct acpi_device_id int3400_thermal_match[] = {
 376         {"INT3400", 0},
 377         {}
 378 };
 379
 380 MODULE_DEVICE_TABLE(acpi, int3400_thermal_match);
 381
 382 static struct platform_driver int3400_thermal_driver = {
 383         .probe = int3400_thermal_probe,
 384         .remove = int3400_thermal_remove,
 385         .driver = {
 386                    .name = "int3400 thermal",
 387                    .acpi_match_table = ACPI_PTR(int3400_thermal_match),
 388                    },
 389 };
 390
 391 module_platform_driver(int3400_thermal_driver);
 392
 393 MODULE_DESCRIPTION("INT3400 Thermal driver");
 394 MODULE_AUTHOR("Zhang Rui <rui.zhang@intel.com>");
 395 MODULE_LICENSE("GPL");