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