drivers/acpi/fan.c

   1 /*
   2  *  acpi_fan.c - ACPI Fan Driver ($Revision: 29 $)
   3  *
   4  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
   5  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   6  *
   7  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License as published by
  11  *  the Free Software Foundation; either version 2 of the License, or (at
  12  *  your option) any later version.
  13  *
  14  *  This program is distributed in the hope that it will be useful, but
  15  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  *  General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License along
  20  *  with this program; if not, write to the Free Software Foundation, Inc.,
  21  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  22  *
  23  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  24  */
  25
  26 #include <linux/kernel.h>
  27 #include <linux/module.h>
  28 #include <linux/init.h>
  29 #include <linux/types.h>
  30 #include <linux/uaccess.h>
  31 #include <linux/thermal.h>
  32 #include <linux/acpi.h>
  33
  34 #define ACPI_FAN_CLASS                  "fan"
  35 #define ACPI_FAN_FILE_STATE             "state"
  36
  37 #define _COMPONENT              ACPI_FAN_COMPONENT
  38 ACPI_MODULE_NAME("fan");
  39
  40 MODULE_AUTHOR("Paul Diefenbaugh");
  41 MODULE_DESCRIPTION("ACPI Fan Driver");
  42 MODULE_LICENSE("GPL");
  43
  44 static int acpi_fan_add(struct acpi_device *device);
  45 static int acpi_fan_remove(struct acpi_device *device);
  46
  47 static const struct acpi_device_id fan_device_ids[] = {
  48         {"PNP0C0B", 0},
  49         {"", 0},
  50 };
  51 MODULE_DEVICE_TABLE(acpi, fan_device_ids);
  52
  53 #ifdef CONFIG_PM_SLEEP
  54 static int acpi_fan_suspend(struct device *dev);
  55 static int acpi_fan_resume(struct device *dev);
  56 static struct dev_pm_ops acpi_fan_pm = {
  57         .resume = acpi_fan_resume,
  58         .freeze = acpi_fan_suspend,
  59         .thaw = acpi_fan_resume,
  60         .restore = acpi_fan_resume,
  61 };
  62 #define FAN_PM_OPS_PTR (&acpi_fan_pm)
  63 #else
  64 #define FAN_PM_OPS_PTR NULL
  65 #endif
  66
  67 static struct acpi_driver acpi_fan_driver = {
  68         .name = "fan",
  69         .class = ACPI_FAN_CLASS,
  70         .ids = fan_device_ids,
  71         .ops = {
  72                 .add = acpi_fan_add,
  73                 .remove = acpi_fan_remove,
  74                 },
  75         .drv.pm = FAN_PM_OPS_PTR,
  76 };
  77
  78 /* thermal cooling device callbacks */
  79 static int fan_get_max_state(struct thermal_cooling_device *cdev, unsigned long
  80                              *state)
  81 {
  82         /* ACPI fan device only support two states: ON/OFF */
  83         *state = 1;
  84         return 0;
  85 }
  86
  87 static int fan_get_cur_state(struct thermal_cooling_device *cdev, unsigned long
  88                              *state)
  89 {
  90         struct acpi_device *device = cdev->devdata;
  91         int result;
  92         int acpi_state = ACPI_STATE_D0;
  93
  94         if (!device)
  95                 return -EINVAL;
  96
  97         result = acpi_bus_update_power(device->handle, &acpi_state);
  98         if (result)
  99                 return result;
 100
 101         *state = (acpi_state == ACPI_STATE_D3_COLD ? 0 :
 102                  (acpi_state == ACPI_STATE_D0 ? 1 : -1));
 103         return 0;
 104 }
 105
 106 static int
 107 fan_set_cur_state(struct thermal_cooling_device *cdev, unsigned long state)
 108 {
 109         struct acpi_device *device = cdev->devdata;
 110         int result;
 111
 112         if (!device || (state != 0 && state != 1))
 113                 return -EINVAL;
 114
 115         result = acpi_bus_set_power(device->handle,
 116                                 state ? ACPI_STATE_D0 : ACPI_STATE_D3_COLD);
 117
 118         return result;
 119 }
 120
 121 static const struct thermal_cooling_device_ops fan_cooling_ops = {
 122         .get_max_state = fan_get_max_state,
 123         .get_cur_state = fan_get_cur_state,
 124         .set_cur_state = fan_set_cur_state,
 125 };
 126
 127 /* --------------------------------------------------------------------------
 128  *                               Driver Interface
 129  * --------------------------------------------------------------------------
 130 */
 131
 132 static int acpi_fan_add(struct acpi_device *device)
 133 {
 134         int result = 0;
 135         struct thermal_cooling_device *cdev;
 136
 137         if (!device)
 138                 return -EINVAL;
 139
 140         strcpy(acpi_device_name(device), "Fan");
 141         strcpy(acpi_device_class(device), ACPI_FAN_CLASS);
 142
 143         result = acpi_bus_update_power(device->handle, NULL);
 144         if (result) {
 145                 dev_err(&device->dev, "Setting initial power state\n");
 146                 goto end;
 147         }
 148
 149         cdev = thermal_cooling_device_register("Fan", device,
 150                                                 &fan_cooling_ops);
 151         if (IS_ERR(cdev)) {
 152                 result = PTR_ERR(cdev);
 153                 goto end;
 154         }
 155
 156         dev_dbg(&device->dev, "registered as cooling_device%d\n", cdev->id);
 157
 158         device->driver_data = cdev;
 159         result = sysfs_create_link(&device->dev.kobj,
 160                                    &cdev->device.kobj,
 161                                    "thermal_cooling");
 162         if (result)
 163                 dev_err(&device->dev, "Failed to create sysfs link "
 164                         "'thermal_cooling'\n");
 165
 166         result = sysfs_create_link(&cdev->device.kobj,
 167                                    &device->dev.kobj,
 168                                    "device");
 169         if (result)
 170                 dev_err(&device->dev, "Failed to create sysfs link 'device'\n");
 171
 172         dev_info(&device->dev, "ACPI: %s [%s] (%s)\n",
 173                acpi_device_name(device), acpi_device_bid(device),
 174                !device->power.state ? "on" : "off");
 175
 176 end:
 177         return result;
 178 }
 179
 180 static int acpi_fan_remove(struct acpi_device *device)
 181 {
 182         struct thermal_cooling_device *cdev;
 183
 184         if (!device)
 185                 return -EINVAL;
 186
 187         cdev =  acpi_driver_data(device);
 188         if (!cdev)
 189                 return -EINVAL;
 190
 191         sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
 192         sysfs_remove_link(&cdev->device.kobj, "device");
 193         thermal_cooling_device_unregister(cdev);
 194
 195         return 0;
 196 }
 197
 198 #ifdef CONFIG_PM_SLEEP
 199 static int acpi_fan_suspend(struct device *dev)
 200 {
 201         if (!dev)
 202                 return -EINVAL;
 203
 204         acpi_bus_set_power(to_acpi_device(dev)->handle, ACPI_STATE_D0);
 205
 206         return AE_OK;
 207 }
 208
 209 static int acpi_fan_resume(struct device *dev)
 210 {
 211         int result;
 212
 213         if (!dev)
 214                 return -EINVAL;
 215
 216         result = acpi_bus_update_power(to_acpi_device(dev)->handle, NULL);
 217         if (result)
 218                 dev_err(dev, "Error updating fan power state\n");
 219
 220         return result;
 221 }
 222 #endif
 223
 224 module_acpi_driver(acpi_fan_driver);