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 <asm/uaccess.h>
  31 #include <linux/thermal.h>
  32 #include <linux/acpi.h>
  33
  34 #define PREFIX "ACPI: "
  35
  36 #define ACPI_FAN_CLASS                  "fan"
  37 #define ACPI_FAN_FILE_STATE             "state"
  38
  39 #define _COMPONENT              ACPI_FAN_COMPONENT
  40 ACPI_MODULE_NAME("fan");
  41
  42 MODULE_AUTHOR("Paul Diefenbaugh");
  43 MODULE_DESCRIPTION("ACPI Fan Driver");
  44 MODULE_LICENSE("GPL");
  45
  46 static int acpi_fan_add(struct acpi_device *device);
  47 static int acpi_fan_remove(struct acpi_device *device);
  48
  49 static const struct acpi_device_id fan_device_ids[] = {
  50         {"PNP0C0B", 0},
  51         {"", 0},
  52 };
  53 MODULE_DEVICE_TABLE(acpi, fan_device_ids);
  54
  55 #ifdef CONFIG_PM_SLEEP
  56 static int acpi_fan_suspend(struct device *dev);
  57 static int acpi_fan_resume(struct device *dev);
  58 static struct dev_pm_ops acpi_fan_pm = {
  59         .resume = acpi_fan_resume,
  60         .freeze = acpi_fan_suspend,
  61         .thaw = acpi_fan_resume,
  62         .restore = acpi_fan_resume,
  63 };
  64 #define FAN_PM_OPS_PTR (&acpi_fan_pm)
  65 #else
  66 #define FAN_PM_OPS_PTR NULL
  67 #endif
  68
  69 static struct acpi_driver acpi_fan_driver = {
  70         .name = "fan",
  71         .class = ACPI_FAN_CLASS,
  72         .ids = fan_device_ids,
  73         .ops = {
  74                 .add = acpi_fan_add,
  75                 .remove = acpi_fan_remove,
  76                 },
  77         .drv.pm = FAN_PM_OPS_PTR,
  78 };
  79
  80 /* thermal cooling device callbacks */
  81 static int fan_get_max_state(struct thermal_cooling_device *cdev, unsigned long
  82                              *state)
  83 {
  84         /* ACPI fan device only support two states: ON/OFF */
  85         *state = 1;
  86         return 0;
  87 }
  88
  89 static int fan_get_cur_state(struct thermal_cooling_device *cdev, unsigned long
  90                              *state)
  91 {
  92         struct acpi_device *device = cdev->devdata;
  93         int result;
  94         int acpi_state = ACPI_STATE_D0;
  95
  96         if (!device)
  97                 return -EINVAL;
  98
  99         result = acpi_bus_update_power(device->handle, &acpi_state);
 100         if (result)
 101                 return result;
 102
 103         *state = (acpi_state == ACPI_STATE_D3_COLD ? 0 :
 104                  (acpi_state == ACPI_STATE_D0 ? 1 : -1));
 105         return 0;
 106 }
 107
 108 static int
 109 fan_set_cur_state(struct thermal_cooling_device *cdev, unsigned long state)
 110 {
 111         struct acpi_device *device = cdev->devdata;
 112         int result;
 113
 114         if (!device || (state != 0 && state != 1))
 115                 return -EINVAL;
 116
 117         result = acpi_bus_set_power(device->handle,
 118                                 state ? ACPI_STATE_D0 : ACPI_STATE_D3_COLD);
 119
 120         return result;
 121 }
 122
 123 static const struct thermal_cooling_device_ops fan_cooling_ops = {
 124         .get_max_state = fan_get_max_state,
 125         .get_cur_state = fan_get_cur_state,
 126         .set_cur_state = fan_set_cur_state,
 127 };
 128
 129 /* --------------------------------------------------------------------------
 130                                  Driver Interface
 131    -------------------------------------------------------------------------- */
 132
 133 static int acpi_fan_add(struct acpi_device *device)
 134 {
 135         int result = 0;
 136         struct thermal_cooling_device *cdev;
 137
 138         if (!device)
 139                 return -EINVAL;
 140
 141         strcpy(acpi_device_name(device), "Fan");
 142         strcpy(acpi_device_class(device), ACPI_FAN_CLASS);
 143
 144         result = acpi_bus_update_power(device->handle, NULL);
 145         if (result) {
 146                 printk(KERN_ERR PREFIX "Setting initial power state\n");
 147                 goto end;
 148         }
 149
 150         cdev = thermal_cooling_device_register("Fan", device,
 151                                                 &fan_cooling_ops);
 152         if (IS_ERR(cdev)) {
 153                 result = PTR_ERR(cdev);
 154                 goto end;
 155         }
 156
 157         dev_dbg(&device->dev, "registered as cooling_device%d\n", cdev->id);
 158
 159         device->driver_data = cdev;
 160         result = sysfs_create_link(&device->dev.kobj,
 161                                    &cdev->device.kobj,
 162                                    "thermal_cooling");
 163         if (result)
 164                 dev_err(&device->dev, "Failed to create sysfs link "
 165                         "'thermal_cooling'\n");
 166
 167         result = sysfs_create_link(&cdev->device.kobj,
 168                                    &device->dev.kobj,
 169                                    "device");
 170         if (result)
 171                 dev_err(&device->dev, "Failed to create sysfs link "
 172                         "'device'\n");
 173
 174         printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
 175                acpi_device_name(device), acpi_device_bid(device),
 176                !device->power.state ? "on" : "off");
 177
 178 end:
 179         return result;
 180 }
 181
 182 static int acpi_fan_remove(struct acpi_device *device)
 183 {
 184         struct thermal_cooling_device *cdev;
 185
 186         if (!device)
 187                 return -EINVAL;
 188
 189         cdev =  acpi_driver_data(device);
 190         if (!cdev)
 191                 return -EINVAL;
 192
 193         sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
 194         sysfs_remove_link(&cdev->device.kobj, "device");
 195         thermal_cooling_device_unregister(cdev);
 196
 197         return 0;
 198 }
 199
 200 #ifdef CONFIG_PM_SLEEP
 201 static int acpi_fan_suspend(struct device *dev)
 202 {
 203         if (!dev)
 204                 return -EINVAL;
 205
 206         acpi_bus_set_power(to_acpi_device(dev)->handle, ACPI_STATE_D0);
 207
 208         return AE_OK;
 209 }
 210
 211 static int acpi_fan_resume(struct device *dev)
 212 {
 213         int result;
 214
 215         if (!dev)
 216                 return -EINVAL;
 217
 218         result = acpi_bus_update_power(to_acpi_device(dev)->handle, NULL);
 219         if (result)
 220                 printk(KERN_ERR PREFIX "Error updating fan power state\n");
 221
 222         return result;
 223 }
 224 #endif
 225
 226 module_acpi_driver(acpi_fan_driver);