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_PASSIVE_2,
  22         INT3400_THERMAL_ACTIVE,
  23         INT3400_THERMAL_CRITICAL,
  24         INT3400_THERMAL_COOLING_MODE,
  25         INT3400_THERMAL_MAXIMUM_UUID,
  26 };
  27
  28 static u8 *int3400_thermal_uuids[INT3400_THERMAL_MAXIMUM_UUID] = {
  29         "42A441D6-AE6A-462b-A84B-4A8CE79027D3",
  30         "9E04115A-AE87-4D1C-9500-0F3E340BFE75",
  31         "3A95C389-E4B8-4629-A526-C52C88626BAE",
  32         "97C68AE7-15FA-499c-B8C9-5DA81D606E0A",
  33         "16CAF1B7-DD38-40ed-B1C1-1B8A1913D531",
  34 };
  35
  36 struct int3400_thermal_priv {
  37         struct acpi_device *adev;
  38         struct thermal_zone_device *thermal;
  39         int mode;
  40         int art_count;
  41         struct art *arts;
  42         int trt_count;
  43         struct trt *trts;
  44         u8 uuid_bitmap;
  45         int rel_misc_dev_res;
  46 };
  47
  48 static int int3400_thermal_get_uuids(struct int3400_thermal_priv *priv)
  49 {
  50         struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL};
  51         union acpi_object *obja, *objb;
  52         int i, j;
  53         int result = 0;
  54         acpi_status status;
  55
  56         status = acpi_evaluate_object(priv->adev->handle, "IDSP", NULL, &buf);
  57         if (ACPI_FAILURE(status))
  58                 return -ENODEV;
  59
  60         obja = (union acpi_object *)buf.pointer;
  61         if (obja->type != ACPI_TYPE_PACKAGE) {
  62                 result = -EINVAL;
  63                 goto end;
  64         }
  65
  66         for (i = 0; i < obja->package.count; i++) {
  67                 objb = &obja->package.elements[i];
  68                 if (objb->type != ACPI_TYPE_BUFFER) {
  69                         result = -EINVAL;
  70                         goto end;
  71                 }
  72
  73                 /* UUID must be 16 bytes */
  74                 if (objb->buffer.length != 16) {
  75                         result = -EINVAL;
  76                         goto end;
  77                 }
  78
  79                 for (j = 0; j < INT3400_THERMAL_MAXIMUM_UUID; j++) {
  80                         u8 uuid[16];
  81
  82                         acpi_str_to_uuid(int3400_thermal_uuids[j], uuid);
  83                         if (!strncmp(uuid, objb->buffer.pointer, 16)) {
  84                                 priv->uuid_bitmap |= (1 << j);
  85                                 break;
  86                         }
  87                 }
  88         }
  89
  90 end:
  91         kfree(buf.pointer);
  92         return result;
  93 }
  94
  95 static int int3400_thermal_run_osc(acpi_handle handle,
  96                                 enum int3400_thermal_uuid uuid, bool enable)
  97 {
  98         u32 ret, buf[2];
  99         acpi_status status;
 100         int result = 0;
 101         struct acpi_osc_context context = {
 102                 .uuid_str = int3400_thermal_uuids[uuid],
 103                 .rev = 1,
 104                 .cap.length = 8,
 105         };
 106
 107         buf[OSC_QUERY_DWORD] = 0;
 108         buf[OSC_SUPPORT_DWORD] = enable;
 109
 110         context.cap.pointer = buf;
 111
 112         status = acpi_run_osc(handle, &context);
 113         if (ACPI_SUCCESS(status)) {
 114                 ret = *((u32 *)(context.ret.pointer + 4));
 115                 if (ret != enable)
 116                         result = -EPERM;
 117         } else
 118                 result = -EPERM;
 119
 120         kfree(context.ret.pointer);
 121         return result;
 122 }
 123
 124 static int int3400_thermal_get_temp(struct thermal_zone_device *thermal,
 125                         unsigned long *temp)
 126 {
 127         *temp = 20 * 1000; /* faked temp sensor with 20C */
 128         return 0;
 129 }
 130
 131 static int int3400_thermal_get_mode(struct thermal_zone_device *thermal,
 132                                 enum thermal_device_mode *mode)
 133 {
 134         struct int3400_thermal_priv *priv = thermal->devdata;
 135
 136         if (!priv)
 137                 return -EINVAL;
 138
 139         *mode = priv->mode;
 140
 141         return 0;
 142 }
 143
 144 static int int3400_thermal_set_mode(struct thermal_zone_device *thermal,
 145                                 enum thermal_device_mode mode)
 146 {
 147         struct int3400_thermal_priv *priv = thermal->devdata;
 148         bool enable;
 149         int result = 0;
 150
 151         if (!priv)
 152                 return -EINVAL;
 153
 154         if (mode == THERMAL_DEVICE_ENABLED)
 155                 enable = true;
 156         else if (mode == THERMAL_DEVICE_DISABLED)
 157                 enable = false;
 158         else
 159                 return -EINVAL;
 160
 161         if (enable != priv->mode) {
 162                 priv->mode = enable;
 163                 /* currently, only PASSIVE COOLING is supported */
 164                 result = int3400_thermal_run_osc(priv->adev->handle,
 165                                         INT3400_THERMAL_PASSIVE_1, enable);
 166         }
 167         return result;
 168 }
 169
 170 static struct thermal_zone_device_ops int3400_thermal_ops = {
 171         .get_temp = int3400_thermal_get_temp,
 172 };
 173
 174 static struct thermal_zone_params int3400_thermal_params = {
 175         .governor_name = "user_space",
 176         .no_hwmon = true,
 177 };
 178
 179 static int int3400_thermal_probe(struct platform_device *pdev)
 180 {
 181         struct acpi_device *adev = ACPI_COMPANION(&pdev->dev);
 182         struct int3400_thermal_priv *priv;
 183         int result;
 184
 185         if (!adev)
 186                 return -ENODEV;
 187
 188         priv = kzalloc(sizeof(struct int3400_thermal_priv), GFP_KERNEL);
 189         if (!priv)
 190                 return -ENOMEM;
 191
 192         priv->adev = adev;
 193
 194         result = int3400_thermal_get_uuids(priv);
 195         if (result)
 196                 goto free_priv;
 197
 198         result = acpi_parse_art(priv->adev->handle, &priv->art_count,
 199                                 &priv->arts, true);
 200         if (result)
 201                 goto free_priv;
 202
 203
 204         result = acpi_parse_trt(priv->adev->handle, &priv->trt_count,
 205                                 &priv->trts, true);
 206         if (result)
 207                 goto free_art;
 208
 209         platform_set_drvdata(pdev, priv);
 210
 211         if (priv->uuid_bitmap & 1 << INT3400_THERMAL_PASSIVE_1) {
 212                 int3400_thermal_ops.get_mode = int3400_thermal_get_mode;
 213                 int3400_thermal_ops.set_mode = int3400_thermal_set_mode;
 214         }
 215         priv->thermal = thermal_zone_device_register("INT3400 Thermal", 0, 0,
 216                                                 priv, &int3400_thermal_ops,
 217                                                 &int3400_thermal_params, 0, 0);
 218         if (IS_ERR(priv->thermal)) {
 219                 result = PTR_ERR(priv->thermal);
 220                 goto free_trt;
 221         }
 222
 223         priv->rel_misc_dev_res = acpi_thermal_rel_misc_device_add(
 224                                                         priv->adev->handle);
 225
 226         return 0;
 227 free_trt:
 228         kfree(priv->trts);
 229 free_art:
 230         kfree(priv->arts);
 231 free_priv:
 232         kfree(priv);
 233         return result;
 234 }
 235
 236 static int int3400_thermal_remove(struct platform_device *pdev)
 237 {
 238         struct int3400_thermal_priv *priv = platform_get_drvdata(pdev);
 239
 240         if (!priv->rel_misc_dev_res)
 241                 acpi_thermal_rel_misc_device_remove(priv->adev->handle);
 242
 243         thermal_zone_device_unregister(priv->thermal);
 244         kfree(priv->trts);
 245         kfree(priv->arts);
 246         kfree(priv);
 247         return 0;
 248 }
 249
 250 static const struct acpi_device_id int3400_thermal_match[] = {
 251         {"INT3400", 0},
 252         {}
 253 };
 254
 255 MODULE_DEVICE_TABLE(acpi, int3400_thermal_match);
 256
 257 static struct platform_driver int3400_thermal_driver = {
 258         .probe = int3400_thermal_probe,
 259         .remove = int3400_thermal_remove,
 260         .driver = {
 261                    .name = "int3400 thermal",
 262                    .owner = THIS_MODULE,
 263                    .acpi_match_table = ACPI_PTR(int3400_thermal_match),
 264                    },
 265 };
 266
 267 module_platform_driver(int3400_thermal_driver);
 268
 269 MODULE_DESCRIPTION("INT3400 Thermal driver");
 270 MODULE_AUTHOR("Zhang Rui <rui.zhang@intel.com>");
 271 MODULE_LICENSE("GPL");