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