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Linux/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);
227 

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