drivers/thermal/int3403_thermal.c

   1 /*
   2  * ACPI INT3403 thermal driver
   3  * Copyright (c) 2013, Intel Corporation.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms and conditions of the GNU General Public License,
   7  * version 2, as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  */
  14
  15 #include <linux/kernel.h>
  16 #include <linux/module.h>
  17 #include <linux/init.h>
  18 #include <linux/types.h>
  19 #include <linux/acpi.h>
  20 #include <linux/thermal.h>
  21
  22 #define INT3403_TYPE_SENSOR             0x03
  23 #define INT3403_PERF_CHANGED_EVENT      0x80
  24 #define INT3403_THERMAL_EVENT           0x90
  25
  26 #define DECI_KELVIN_TO_MILLI_CELSIUS(t, off) (((t) - (off)) * 100)
  27 #define KELVIN_OFFSET   2732
  28 #define MILLI_CELSIUS_TO_DECI_KELVIN(t, off) (((t) / 100) + (off))
  29
  30 #define ACPI_INT3403_CLASS              "int3403"
  31 #define ACPI_INT3403_FILE_STATE         "state"
  32
  33 struct int3403_sensor {
  34         struct thermal_zone_device *tzone;
  35         unsigned long *thresholds;
  36 };
  37
  38 static int sys_get_curr_temp(struct thermal_zone_device *tzone,
  39                                 unsigned long *temp)
  40 {
  41         struct acpi_device *device = tzone->devdata;
  42         unsigned long long tmp;
  43         acpi_status status;
  44
  45         status = acpi_evaluate_integer(device->handle, "_TMP", NULL, &tmp);
  46         if (ACPI_FAILURE(status))
  47                 return -EIO;
  48
  49         *temp = DECI_KELVIN_TO_MILLI_CELSIUS(tmp, KELVIN_OFFSET);
  50
  51         return 0;
  52 }
  53
  54 static int sys_get_trip_hyst(struct thermal_zone_device *tzone,
  55                 int trip, unsigned long *temp)
  56 {
  57         struct acpi_device *device = tzone->devdata;
  58         unsigned long long hyst;
  59         acpi_status status;
  60
  61         status = acpi_evaluate_integer(device->handle, "GTSH", NULL, &hyst);
  62         if (ACPI_FAILURE(status))
  63                 return -EIO;
  64
  65         *temp = DECI_KELVIN_TO_MILLI_CELSIUS(hyst, KELVIN_OFFSET);
  66
  67         return 0;
  68 }
  69
  70 static int sys_get_trip_temp(struct thermal_zone_device *tzone,
  71                 int trip, unsigned long *temp)
  72 {
  73         struct acpi_device *device = tzone->devdata;
  74         struct int3403_sensor *obj = acpi_driver_data(device);
  75
  76         /*
  77          * get_trip_temp is a mandatory callback but
  78          * PATx method doesn't return any value, so return
  79          * cached value, which was last set from user space.
  80          */
  81         *temp = obj->thresholds[trip];
  82
  83         return 0;
  84 }
  85
  86 static int sys_get_trip_type(struct thermal_zone_device *thermal,
  87                 int trip, enum thermal_trip_type *type)
  88 {
  89         /* Mandatory callback, may not mean much here */
  90         *type = THERMAL_TRIP_PASSIVE;
  91
  92         return 0;
  93 }
  94
  95 int sys_set_trip_temp(struct thermal_zone_device *tzone, int trip,
  96                                                         unsigned long temp)
  97 {
  98         struct acpi_device *device = tzone->devdata;
  99         acpi_status status;
 100         char name[10];
 101         int ret = 0;
 102         struct int3403_sensor *obj = acpi_driver_data(device);
 103
 104         snprintf(name, sizeof(name), "PAT%d", trip);
 105         if (acpi_has_method(device->handle, name)) {
 106                 status = acpi_execute_simple_method(device->handle, name,
 107                                 MILLI_CELSIUS_TO_DECI_KELVIN(temp,
 108                                                         KELVIN_OFFSET));
 109                 if (ACPI_FAILURE(status))
 110                         ret = -EIO;
 111                 else
 112                         obj->thresholds[trip] = temp;
 113         } else {
 114                 ret = -EIO;
 115                 dev_err(&device->dev, "sys_set_trip_temp: method not found\n");
 116         }
 117
 118         return ret;
 119 }
 120
 121 static struct thermal_zone_device_ops tzone_ops = {
 122         .get_temp = sys_get_curr_temp,
 123         .get_trip_temp = sys_get_trip_temp,
 124         .get_trip_type = sys_get_trip_type,
 125         .set_trip_temp = sys_set_trip_temp,
 126         .get_trip_hyst =  sys_get_trip_hyst,
 127 };
 128
 129 static void acpi_thermal_notify(struct acpi_device *device, u32 event)
 130 {
 131         struct int3403_sensor *obj;
 132
 133         if (!device)
 134                 return;
 135
 136         obj = acpi_driver_data(device);
 137         if (!obj)
 138                 return;
 139
 140         switch (event) {
 141         case INT3403_PERF_CHANGED_EVENT:
 142                 break;
 143         case INT3403_THERMAL_EVENT:
 144                 thermal_zone_device_update(obj->tzone);
 145                 break;
 146         default:
 147                 dev_err(&device->dev, "Unsupported event [0x%x]\n", event);
 148                 break;
 149         }
 150 }
 151
 152 static int acpi_int3403_add(struct acpi_device *device)
 153 {
 154         int result = 0;
 155         unsigned long long ptyp;
 156         acpi_status status;
 157         struct int3403_sensor *obj;
 158         unsigned long long trip_cnt;
 159         int trip_mask = 0;
 160
 161         if (!device)
 162                 return -EINVAL;
 163
 164         status = acpi_evaluate_integer(device->handle, "PTYP", NULL, &ptyp);
 165         if (ACPI_FAILURE(status))
 166                 return -EINVAL;
 167
 168         if (ptyp != INT3403_TYPE_SENSOR)
 169                 return -EINVAL;
 170
 171         obj = devm_kzalloc(&device->dev, sizeof(*obj), GFP_KERNEL);
 172         if (!obj)
 173                 return -ENOMEM;
 174
 175         device->driver_data = obj;
 176
 177         status = acpi_evaluate_integer(device->handle, "PATC", NULL,
 178                                                 &trip_cnt);
 179         if (ACPI_FAILURE(status))
 180                 trip_cnt = 0;
 181
 182         if (trip_cnt) {
 183                 /* We have to cache, thresholds can't be readback */
 184                 obj->thresholds = devm_kzalloc(&device->dev,
 185                                         sizeof(*obj->thresholds) * trip_cnt,
 186                                         GFP_KERNEL);
 187                 if (!obj->thresholds)
 188                         return -ENOMEM;
 189                 trip_mask = BIT(trip_cnt) - 1;
 190         }
 191         obj->tzone = thermal_zone_device_register(acpi_device_bid(device),
 192                                 trip_cnt, trip_mask, device, &tzone_ops,
 193                                 NULL, 0, 0);
 194         if (IS_ERR(obj->tzone)) {
 195                 result = PTR_ERR(obj->tzone);
 196                 return result;
 197         }
 198
 199         strcpy(acpi_device_name(device), "INT3403");
 200         strcpy(acpi_device_class(device), ACPI_INT3403_CLASS);
 201
 202         return 0;
 203 }
 204
 205 static int acpi_int3403_remove(struct acpi_device *device)
 206 {
 207         struct int3403_sensor *obj;
 208
 209         obj = acpi_driver_data(device);
 210         thermal_zone_device_unregister(obj->tzone);
 211
 212         return 0;
 213 }
 214
 215 ACPI_MODULE_NAME("int3403");
 216 static const struct acpi_device_id int3403_device_ids[] = {
 217         {"INT3403", 0},
 218         {"", 0},
 219 };
 220 MODULE_DEVICE_TABLE(acpi, int3403_device_ids);
 221
 222 static struct acpi_driver acpi_int3403_driver = {
 223         .name = "INT3403",
 224         .class = ACPI_INT3403_CLASS,
 225         .ids = int3403_device_ids,
 226         .ops = {
 227                 .add = acpi_int3403_add,
 228                 .remove = acpi_int3403_remove,
 229                 .notify = acpi_thermal_notify,
 230                 },
 231 };
 232
 233 module_acpi_driver(acpi_int3403_driver);
 234
 235 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
 236 MODULE_LICENSE("GPL v2");
 237 MODULE_DESCRIPTION("ACPI INT3403 thermal driver");