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_ADAPTIVE_PERFORMANCE,
  24         INT3400_THERMAL_EMERGENCY_CALL_MODE,
  25         INT3400_THERMAL_PASSIVE_2,
  26         INT3400_THERMAL_POWER_BOSS,
  27         INT3400_THERMAL_VIRTUAL_SENSOR,
  28         INT3400_THERMAL_COOLING_MODE,
  29         INT3400_THERMAL_HARDWARE_DUTY_CYCLING,
  30         INT3400_THERMAL_MAXIMUM_UUID,
  31 };
  32
  33 static u8 *int3400_thermal_uuids[INT3400_THERMAL_MAXIMUM_UUID] = {
  34         "42A441D6-AE6A-462b-A84B-4A8CE79027D3",
  35         "3A95C389-E4B8-4629-A526-C52C88626BAE",
  36         "97C68AE7-15FA-499c-B8C9-5DA81D606E0A",
  37         "63BE270F-1C11-48FD-A6F7-3AF253FF3E2D",
  38         "5349962F-71E6-431D-9AE8-0A635B710AEE",
  39         "9E04115A-AE87-4D1C-9500-0F3E340BFE75",
  40         "F5A35014-C209-46A4-993A-EB56DE7530A1",
  41         "6ED722A7-9240-48A5-B479-31EEF723D7CF",
  42         "16CAF1B7-DD38-40ED-B1C1-1B8A1913D531",
  43         "BE84BABF-C4D4-403D-B495-3128FD44dAC1",
  44 };
  45
  46 struct int3400_thermal_priv {
  47         struct acpi_device *adev;
  48         struct thermal_zone_device *thermal;
  49         int mode;
  50         int art_count;
  51         struct art *arts;
  52         int trt_count;
  53         struct trt *trts;
  54         u8 uuid_bitmap;
  55         int rel_misc_dev_res;
  56         int current_uuid_index;
  57 };
  58
  59 static ssize_t available_uuids_show(struct device *dev,
  60                                     struct device_attribute *attr,
  61                                     char *buf)
  62 {
  63         struct platform_device *pdev = to_platform_device(dev);
  64         struct int3400_thermal_priv *priv = platform_get_drvdata(pdev);
  65         int i;
  66         int length = 0;
  67
  68         for (i = 0; i < INT3400_THERMAL_MAXIMUM_UUID; i++) {
  69                 if (priv->uuid_bitmap & (1 << i))
  70                         if (PAGE_SIZE - length > 0)
  71                                 length += snprintf(&buf[length],
  72                                                    PAGE_SIZE - length,
  73                                                    "%s\n",
  74                                                    int3400_thermal_uuids[i]);
  75         }
  76
  77         return length;
  78 }
  79
  80 static ssize_t current_uuid_show(struct device *dev,
  81                                  struct device_attribute *devattr, char *buf)
  82 {
  83         struct platform_device *pdev = to_platform_device(dev);
  84         struct int3400_thermal_priv *priv = platform_get_drvdata(pdev);
  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 platform_device *pdev = to_platform_device(dev);
  98         struct int3400_thermal_priv *priv = platform_get_drvdata(pdev);
  99         int i;
 100
 101         for (i = 0; i < INT3400_THERMAL_MAXIMUM_UUID; ++i) {
 102                 if ((priv->uuid_bitmap & (1 << i)) &&
 103                     !(strncmp(buf, int3400_thermal_uuids[i],
 104                               sizeof(int3400_thermal_uuids[i]) - 1))) {
 105                         priv->current_uuid_index = i;
 106                         return count;
 107                 }
 108         }
 109
 110         return -EINVAL;
 111 }
 112
 113 static DEVICE_ATTR(current_uuid, 0644, current_uuid_show, current_uuid_store);
 114 static DEVICE_ATTR_RO(available_uuids);
 115 static struct attribute *uuid_attrs[] = {
 116         &dev_attr_available_uuids.attr,
 117         &dev_attr_current_uuid.attr,
 118         NULL
 119 };
 120
 121 static struct attribute_group uuid_attribute_group = {
 122         .attrs = uuid_attrs,
 123         .name = "uuids"
 124 };
 125
 126 static int int3400_thermal_get_uuids(struct int3400_thermal_priv *priv)
 127 {
 128         struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL};
 129         union acpi_object *obja, *objb;
 130         int i, j;
 131         int result = 0;
 132         acpi_status status;
 133
 134         status = acpi_evaluate_object(priv->adev->handle, "IDSP", NULL, &buf);
 135         if (ACPI_FAILURE(status))
 136                 return -ENODEV;
 137
 138         obja = (union acpi_object *)buf.pointer;
 139         if (obja->type != ACPI_TYPE_PACKAGE) {
 140                 result = -EINVAL;
 141                 goto end;
 142         }
 143
 144         for (i = 0; i < obja->package.count; i++) {
 145                 objb = &obja->package.elements[i];
 146                 if (objb->type != ACPI_TYPE_BUFFER) {
 147                         result = -EINVAL;
 148                         goto end;
 149                 }
 150
 151                 /* UUID must be 16 bytes */
 152                 if (objb->buffer.length != 16) {
 153                         result = -EINVAL;
 154                         goto end;
 155                 }
 156
 157                 for (j = 0; j < INT3400_THERMAL_MAXIMUM_UUID; j++) {
 158                         u8 uuid[16];
 159
 160                         acpi_str_to_uuid(int3400_thermal_uuids[j], uuid);
 161                         if (!strncmp(uuid, objb->buffer.pointer, 16)) {
 162                                 priv->uuid_bitmap |= (1 << j);
 163                                 break;
 164                         }
 165                 }
 166         }
 167
 168 end:
 169         kfree(buf.pointer);
 170         return result;
 171 }
 172
 173 static int int3400_thermal_run_osc(acpi_handle handle,
 174                                 enum int3400_thermal_uuid uuid, bool enable)
 175 {
 176         u32 ret, buf[2];
 177         acpi_status status;
 178         int result = 0;
 179         struct acpi_osc_context context = {
 180                 .uuid_str = int3400_thermal_uuids[uuid],
 181                 .rev = 1,
 182                 .cap.length = 8,
 183         };
 184
 185         buf[OSC_QUERY_DWORD] = 0;
 186         buf[OSC_SUPPORT_DWORD] = enable;
 187
 188         context.cap.pointer = buf;
 189
 190         status = acpi_run_osc(handle, &context);
 191         if (ACPI_SUCCESS(status)) {
 192                 ret = *((u32 *)(context.ret.pointer + 4));
 193                 if (ret != enable)
 194                         result = -EPERM;
 195         } else
 196                 result = -EPERM;
 197
 198         kfree(context.ret.pointer);
 199         return result;
 200 }
 201
 202 static int int3400_thermal_get_temp(struct thermal_zone_device *thermal,
 203                         int *temp)
 204 {
 205         *temp = 20 * 1000; /* faked temp sensor with 20C */
 206         return 0;
 207 }
 208
 209 static int int3400_thermal_get_mode(struct thermal_zone_device *thermal,
 210                                 enum thermal_device_mode *mode)
 211 {
 212         struct int3400_thermal_priv *priv = thermal->devdata;
 213
 214         if (!priv)
 215                 return -EINVAL;
 216
 217         *mode = priv->mode;
 218
 219         return 0;
 220 }
 221
 222 static int int3400_thermal_set_mode(struct thermal_zone_device *thermal,
 223                                 enum thermal_device_mode mode)
 224 {
 225         struct int3400_thermal_priv *priv = thermal->devdata;
 226         bool enable;
 227         int result = 0;
 228
 229         if (!priv)
 230                 return -EINVAL;
 231
 232         if (mode == THERMAL_DEVICE_ENABLED)
 233                 enable = true;
 234         else if (mode == THERMAL_DEVICE_DISABLED)
 235                 enable = false;
 236         else
 237                 return -EINVAL;
 238
 239         if (enable != priv->mode) {
 240                 priv->mode = enable;
 241                 result = int3400_thermal_run_osc(priv->adev->handle,
 242                                                  priv->current_uuid_index,
 243                                                  enable);
 244         }
 245         return result;
 246 }
 247
 248 static struct thermal_zone_device_ops int3400_thermal_ops = {
 249         .get_temp = int3400_thermal_get_temp,
 250 };
 251
 252 static struct thermal_zone_params int3400_thermal_params = {
 253         .governor_name = "user_space",
 254         .no_hwmon = true,
 255 };
 256
 257 static int int3400_thermal_probe(struct platform_device *pdev)
 258 {
 259         struct acpi_device *adev = ACPI_COMPANION(&pdev->dev);
 260         struct int3400_thermal_priv *priv;
 261         int result;
 262
 263         if (!adev)
 264                 return -ENODEV;
 265
 266         priv = kzalloc(sizeof(struct int3400_thermal_priv), GFP_KERNEL);
 267         if (!priv)
 268                 return -ENOMEM;
 269
 270         priv->adev = adev;
 271
 272         result = int3400_thermal_get_uuids(priv);
 273         if (result)
 274                 goto free_priv;
 275
 276         result = acpi_parse_art(priv->adev->handle, &priv->art_count,
 277                                 &priv->arts, true);
 278         if (result)
 279                 dev_dbg(&pdev->dev, "_ART table parsing error\n");
 280
 281         result = acpi_parse_trt(priv->adev->handle, &priv->trt_count,
 282                                 &priv->trts, true);
 283         if (result)
 284                 dev_dbg(&pdev->dev, "_TRT table parsing error\n");
 285
 286         platform_set_drvdata(pdev, priv);
 287
 288         int3400_thermal_ops.get_mode = int3400_thermal_get_mode;
 289         int3400_thermal_ops.set_mode = int3400_thermal_set_mode;
 290
 291         priv->thermal = thermal_zone_device_register("INT3400 Thermal", 0, 0,
 292                                                 priv, &int3400_thermal_ops,
 293                                                 &int3400_thermal_params, 0, 0);
 294         if (IS_ERR(priv->thermal)) {
 295                 result = PTR_ERR(priv->thermal);
 296                 goto free_art_trt;
 297         }
 298
 299         priv->rel_misc_dev_res = acpi_thermal_rel_misc_device_add(
 300                                                         priv->adev->handle);
 301
 302         result = sysfs_create_group(&pdev->dev.kobj, &uuid_attribute_group);
 303         if (result)
 304                 goto free_zone;
 305
 306         return 0;
 307
 308 free_zone:
 309         thermal_zone_device_unregister(priv->thermal);
 310 free_art_trt:
 311         kfree(priv->trts);
 312         kfree(priv->arts);
 313 free_priv:
 314         kfree(priv);
 315         return result;
 316 }
 317
 318 static int int3400_thermal_remove(struct platform_device *pdev)
 319 {
 320         struct int3400_thermal_priv *priv = platform_get_drvdata(pdev);
 321
 322         if (!priv->rel_misc_dev_res)
 323                 acpi_thermal_rel_misc_device_remove(priv->adev->handle);
 324
 325         sysfs_remove_group(&pdev->dev.kobj, &uuid_attribute_group);
 326         thermal_zone_device_unregister(priv->thermal);
 327         kfree(priv->trts);
 328         kfree(priv->arts);
 329         kfree(priv);
 330         return 0;
 331 }
 332
 333 static const struct acpi_device_id int3400_thermal_match[] = {
 334         {"INT3400", 0},
 335         {}
 336 };
 337
 338 MODULE_DEVICE_TABLE(acpi, int3400_thermal_match);
 339
 340 static struct platform_driver int3400_thermal_driver = {
 341         .probe = int3400_thermal_probe,
 342         .remove = int3400_thermal_remove,
 343         .driver = {
 344                    .name = "int3400 thermal",
 345                    .acpi_match_table = ACPI_PTR(int3400_thermal_match),
 346                    },
 347 };
 348
 349 module_platform_driver(int3400_thermal_driver);
 350
 351 MODULE_DESCRIPTION("INT3400 Thermal driver");
 352 MODULE_AUTHOR("Zhang Rui <rui.zhang@intel.com>");
 353 MODULE_LICENSE("GPL");