2 * acpi_fan.c - ACPI Fan Driver ($Revision: 29 $)
4 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
5 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
7 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.
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.
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.
23 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
26 #include <linux/kernel.h>
27 #include <linux/module.h>
28 #include <linux/init.h>
29 #include <linux/types.h>
30 #include <linux/proc_fs.h>
31 #include <asm/uaccess.h>
33 #include <acpi/acpi_bus.h>
34 #include <acpi/acpi_drivers.h>
37 #define ACPI_FAN_COMPONENT 0x00200000
38 #define ACPI_FAN_CLASS "fan"
39 #define ACPI_FAN_HID "PNP0C0B"
40 #define ACPI_FAN_DRIVER_NAME "ACPI Fan Driver"
41 #define ACPI_FAN_DEVICE_NAME "Fan"
42 #define ACPI_FAN_FILE_STATE "state"
43 #define ACPI_FAN_NOTIFY_STATUS 0x80
45 #define _COMPONENT ACPI_FAN_COMPONENT
46 ACPI_MODULE_NAME ("acpi_fan")
48 MODULE_AUTHOR("Paul Diefenbaugh");
49 MODULE_DESCRIPTION(ACPI_FAN_DRIVER_NAME);
50 MODULE_LICENSE("GPL");
52 int acpi_fan_add (struct acpi_device *device);
53 int acpi_fan_remove (struct acpi_device *device, int type);
55 static struct acpi_driver acpi_fan_driver = {
56 .name = ACPI_FAN_DRIVER_NAME,
57 .class = ACPI_FAN_CLASS,
61 .remove = acpi_fan_remove,
70 /* --------------------------------------------------------------------------
72 -------------------------------------------------------------------------- */
74 struct proc_dir_entry *acpi_fan_dir;
86 struct acpi_fan *fan = (struct acpi_fan *) data;
91 ACPI_FUNCTION_TRACE("acpi_fan_read_state");
93 if (!fan || (off != 0))
96 if (acpi_bus_get_power(fan->handle, &state))
99 p += sprintf(p, "status: %s\n",
104 if (len <= off+count) *eof = 1;
107 if (len>count) len = count;
115 acpi_fan_write_state (
117 const char __user *buffer,
122 struct acpi_fan *fan = (struct acpi_fan *) data;
123 char state_string[12] = {'\0'};
125 ACPI_FUNCTION_TRACE("acpi_fan_write_state");
127 if (!fan || (count > sizeof(state_string) - 1))
128 return_VALUE(-EINVAL);
130 if (copy_from_user(state_string, buffer, count))
131 return_VALUE(-EFAULT);
133 state_string[count] = '\0';
135 result = acpi_bus_set_power(fan->handle,
136 simple_strtoul(state_string, NULL, 0));
138 return_VALUE(result);
146 struct acpi_device *device)
148 struct proc_dir_entry *entry = NULL;
150 ACPI_FUNCTION_TRACE("acpi_fan_add_fs");
153 return_VALUE(-EINVAL);
155 if (!acpi_device_dir(device)) {
156 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
158 if (!acpi_device_dir(device))
159 return_VALUE(-ENODEV);
160 acpi_device_dir(device)->owner = THIS_MODULE;
164 entry = create_proc_entry(ACPI_FAN_FILE_STATE,
165 S_IFREG|S_IRUGO|S_IWUSR, acpi_device_dir(device));
167 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
168 "Unable to create '%s' fs entry\n",
169 ACPI_FAN_FILE_STATE));
171 entry->read_proc = acpi_fan_read_state;
172 entry->write_proc = acpi_fan_write_state;
173 entry->data = acpi_driver_data(device);
174 entry->owner = THIS_MODULE;
183 struct acpi_device *device)
185 ACPI_FUNCTION_TRACE("acpi_fan_remove_fs");
187 if (acpi_device_dir(device)) {
188 remove_proc_entry(ACPI_FAN_FILE_STATE,
189 acpi_device_dir(device));
190 remove_proc_entry(acpi_device_bid(device), acpi_fan_dir);
191 acpi_device_dir(device) = NULL;
198 /* --------------------------------------------------------------------------
200 -------------------------------------------------------------------------- */
204 struct acpi_device *device)
207 struct acpi_fan *fan = NULL;
210 ACPI_FUNCTION_TRACE("acpi_fan_add");
213 return_VALUE(-EINVAL);
215 fan = kmalloc(sizeof(struct acpi_fan), GFP_KERNEL);
217 return_VALUE(-ENOMEM);
218 memset(fan, 0, sizeof(struct acpi_fan));
220 fan->handle = device->handle;
221 strcpy(acpi_device_name(device), ACPI_FAN_DEVICE_NAME);
222 strcpy(acpi_device_class(device), ACPI_FAN_CLASS);
223 acpi_driver_data(device) = fan;
225 result = acpi_bus_get_power(fan->handle, &state);
227 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
228 "Error reading power state\n"));
232 result = acpi_fan_add_fs(device);
236 printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
237 acpi_device_name(device), acpi_device_bid(device),
238 !device->power.state?"on":"off");
244 return_VALUE(result);
250 struct acpi_device *device,
253 struct acpi_fan *fan = NULL;
255 ACPI_FUNCTION_TRACE("acpi_fan_remove");
257 if (!device || !acpi_driver_data(device))
258 return_VALUE(-EINVAL);
260 fan = (struct acpi_fan *) acpi_driver_data(device);
262 acpi_fan_remove_fs(device);
275 ACPI_FUNCTION_TRACE("acpi_fan_init");
277 acpi_fan_dir = proc_mkdir(ACPI_FAN_CLASS, acpi_root_dir);
279 return_VALUE(-ENODEV);
280 acpi_fan_dir->owner = THIS_MODULE;
282 result = acpi_bus_register_driver(&acpi_fan_driver);
284 remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir);
285 return_VALUE(-ENODEV);
295 ACPI_FUNCTION_TRACE("acpi_fan_exit");
297 acpi_bus_unregister_driver(&acpi_fan_driver);
299 remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir);
305 module_init(acpi_fan_init);
306 module_exit(acpi_fan_exit);