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 <acpi/acpi_bus.h>
  33 #include <acpi/acpi_drivers.h>
  34
  35 #define PREFIX "ACPI: "
  36
  37 #define ACPI_FAN_CLASS                  "fan"
  38 #define ACPI_FAN_FILE_STATE             "state"
  39
  40 #define _COMPONENT              ACPI_FAN_COMPONENT
  41 ACPI_MODULE_NAME("fan");
  42
  43 MODULE_AUTHOR("Paul Diefenbaugh");
  44 MODULE_DESCRIPTION("ACPI Fan Driver");
  45 MODULE_LICENSE("GPL");
  46
  47 static int acpi_fan_add(struct acpi_device *device);
  48 static int acpi_fan_remove(struct acpi_device *device);
  49
  50 static const struct acpi_device_id fan_device_ids[] = {
  51         {"PNP0C0B", 0},
  52         {"", 0},
  53 };
  54 MODULE_DEVICE_TABLE(acpi, fan_device_ids);
  55
  56 #ifdef CONFIG_PM_SLEEP
  57 static int acpi_fan_suspend(struct device *dev);
  58 static int acpi_fan_resume(struct device *dev);
  59 #endif
  60 static SIMPLE_DEV_PM_OPS(acpi_fan_pm, acpi_fan_suspend, acpi_fan_resume);
  61
  62 static struct acpi_driver acpi_fan_driver = {
  63         .name = "fan",
  64         .class = ACPI_FAN_CLASS,
  65         .ids = fan_device_ids,
  66         .ops = {
  67                 .add = acpi_fan_add,
  68                 .remove = acpi_fan_remove,
  69                 },
  70         .drv.pm = &acpi_fan_pm,
  71 };
  72
  73 /* thermal cooling device callbacks */
  74 static int fan_get_max_state(struct thermal_cooling_device *cdev, unsigned long
  75                              *state)
  76 {
  77         /* ACPI fan device only support two states: ON/OFF */
  78         *state = 1;
  79         return 0;
  80 }
  81
  82 static int fan_get_cur_state(struct thermal_cooling_device *cdev, unsigned long
  83                              *state)
  84 {
  85         struct acpi_device *device = cdev->devdata;
  86         int result;
  87         int acpi_state;
  88
  89         if (!device)
  90                 return -EINVAL;
  91
  92         result = acpi_bus_update_power(device->handle, &acpi_state);
  93         if (result)
  94                 return result;
  95
  96         *state = (acpi_state == ACPI_STATE_D3 ? 0 :
  97                  (acpi_state == ACPI_STATE_D0 ? 1 : -1));
  98         return 0;
  99 }
 100
 101 static int
 102 fan_set_cur_state(struct thermal_cooling_device *cdev, unsigned long state)
 103 {
 104         struct acpi_device *device = cdev->devdata;
 105         int result;
 106
 107         if (!device || (state != 0 && state != 1))
 108                 return -EINVAL;
 109
 110         result = acpi_bus_set_power(device->handle,
 111                                 state ? ACPI_STATE_D0 : ACPI_STATE_D3);
 112
 113         return result;
 114 }
 115
 116 static const struct thermal_cooling_device_ops fan_cooling_ops = {
 117         .get_max_state = fan_get_max_state,
 118         .get_cur_state = fan_get_cur_state,
 119         .set_cur_state = fan_set_cur_state,
 120 };
 121
 122 /* --------------------------------------------------------------------------
 123                                  Driver Interface
 124    -------------------------------------------------------------------------- */
 125
 126 static int acpi_fan_add(struct acpi_device *device)
 127 {
 128         int result = 0;
 129         struct thermal_cooling_device *cdev;
 130
 131         if (!device)
 132                 return -EINVAL;
 133
 134         strcpy(acpi_device_name(device), "Fan");
 135         strcpy(acpi_device_class(device), ACPI_FAN_CLASS);
 136
 137         result = acpi_bus_update_power(device->handle, NULL);
 138         if (result) {
 139                 printk(KERN_ERR PREFIX "Setting initial power state\n");
 140                 goto end;
 141         }
 142
 143         cdev = thermal_cooling_device_register("Fan", device,
 144                                                 &fan_cooling_ops);
 145         if (IS_ERR(cdev)) {
 146                 result = PTR_ERR(cdev);
 147                 goto end;
 148         }
 149
 150         dev_dbg(&device->dev, "registered as cooling_device%d\n", cdev->id);
 151
 152         device->driver_data = cdev;
 153         result = sysfs_create_link(&device->dev.kobj,
 154                                    &cdev->device.kobj,
 155                                    "thermal_cooling");
 156         if (result)
 157                 dev_err(&device->dev, "Failed to create sysfs link "
 158                         "'thermal_cooling'\n");
 159
 160         result = sysfs_create_link(&cdev->device.kobj,
 161                                    &device->dev.kobj,
 162                                    "device");
 163         if (result)
 164                 dev_err(&device->dev, "Failed to create sysfs link "
 165                         "'device'\n");
 166
 167         printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
 168                acpi_device_name(device), acpi_device_bid(device),
 169                !device->power.state ? "on" : "off");
 170
 171       end:
 172         return result;
 173 }
 174
 175 static int acpi_fan_remove(struct acpi_device *device)
 176 {
 177         struct thermal_cooling_device *cdev;
 178
 179         if (!device)
 180                 return -EINVAL;
 181
 182         cdev =  acpi_driver_data(device);
 183         if (!cdev)
 184                 return -EINVAL;
 185
 186         sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
 187         sysfs_remove_link(&cdev->device.kobj, "device");
 188         thermal_cooling_device_unregister(cdev);
 189
 190         return 0;
 191 }
 192
 193 #ifdef CONFIG_PM_SLEEP
 194 static int acpi_fan_suspend(struct device *dev)
 195 {
 196         if (!dev)
 197                 return -EINVAL;
 198
 199         acpi_bus_set_power(to_acpi_device(dev)->handle, ACPI_STATE_D0);
 200
 201         return AE_OK;
 202 }
 203
 204 static int acpi_fan_resume(struct device *dev)
 205 {
 206         int result;
 207
 208         if (!dev)
 209                 return -EINVAL;
 210
 211         result = acpi_bus_update_power(to_acpi_device(dev)->handle, NULL);
 212         if (result)
 213                 printk(KERN_ERR PREFIX "Error updating fan power state\n");
 214
 215         return result;
 216 }
 217 #endif
 218
 219 module_acpi_driver(acpi_fan_driver);