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