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 <linux/seq_file.h>
32 #include <asm/uaccess.h>
33 #include <linux/thermal.h>
34 #include <acpi/acpi_bus.h>
35 #include <acpi/acpi_drivers.h>
37 #define PREFIX "ACPI: "
39 #define ACPI_FAN_CLASS "fan"
40 #define ACPI_FAN_FILE_STATE "state"
42 #define _COMPONENT ACPI_FAN_COMPONENT
43 ACPI_MODULE_NAME("fan");
45 MODULE_AUTHOR("Paul Diefenbaugh");
46 MODULE_DESCRIPTION("ACPI Fan Driver");
47 MODULE_LICENSE("GPL");
49 static int acpi_fan_add(struct acpi_device *device);
50 static int acpi_fan_remove(struct acpi_device *device, int type);
51 static int acpi_fan_suspend(struct acpi_device *device, pm_message_t state);
52 static int acpi_fan_resume(struct acpi_device *device);
54 static const struct acpi_device_id fan_device_ids[] = {
58 MODULE_DEVICE_TABLE(acpi, fan_device_ids);
60 static struct acpi_driver acpi_fan_driver = {
62 .class = ACPI_FAN_CLASS,
63 .ids = fan_device_ids,
66 .remove = acpi_fan_remove,
67 .suspend = acpi_fan_suspend,
68 .resume = acpi_fan_resume,
72 /* thermal cooling device callbacks */
73 static int fan_get_max_state(struct thermal_cooling_device *cdev, unsigned long
76 /* ACPI fan device only support two states: ON/OFF */
81 static int fan_get_cur_state(struct thermal_cooling_device *cdev, unsigned long
84 struct acpi_device *device = cdev->devdata;
91 result = acpi_bus_get_power(device->handle, &acpi_state);
95 *state = (acpi_state == ACPI_STATE_D3 ? 0 :
96 (acpi_state == ACPI_STATE_D0 ? 1 : -1));
101 fan_set_cur_state(struct thermal_cooling_device *cdev, unsigned long state)
103 struct acpi_device *device = cdev->devdata;
106 if (!device || (state != 0 && state != 1))
109 result = acpi_bus_set_power(device->handle,
110 state ? ACPI_STATE_D0 : ACPI_STATE_D3);
115 static struct thermal_cooling_device_ops fan_cooling_ops = {
116 .get_max_state = fan_get_max_state,
117 .get_cur_state = fan_get_cur_state,
118 .set_cur_state = fan_set_cur_state,
121 /* --------------------------------------------------------------------------
123 -------------------------------------------------------------------------- */
124 #ifdef CONFIG_ACPI_PROCFS
126 static struct proc_dir_entry *acpi_fan_dir;
128 static int acpi_fan_read_state(struct seq_file *seq, void *offset)
130 struct acpi_device *device = seq->private;
135 if (acpi_bus_get_power(device->handle, &state))
136 seq_printf(seq, "status: ERROR\n");
138 seq_printf(seq, "status: %s\n",
139 !state ? "on" : "off");
144 static int acpi_fan_state_open_fs(struct inode *inode, struct file *file)
146 return single_open(file, acpi_fan_read_state, PDE(inode)->data);
150 acpi_fan_write_state(struct file *file, const char __user * buffer,
151 size_t count, loff_t * ppos)
154 struct seq_file *m = file->private_data;
155 struct acpi_device *device = m->private;
156 char state_string[3] = { '\0' };
158 if (count > sizeof(state_string) - 1)
161 if (copy_from_user(state_string, buffer, count))
164 state_string[count] = '\0';
165 if ((state_string[0] < '0') || (state_string[0] > '3'))
167 if (state_string[1] == '\n')
168 state_string[1] = '\0';
169 if (state_string[1] != '\0')
172 result = acpi_bus_set_power(device->handle,
173 simple_strtoul(state_string, NULL, 0));
180 static const struct file_operations acpi_fan_state_ops = {
181 .open = acpi_fan_state_open_fs,
183 .write = acpi_fan_write_state,
185 .release = single_release,
186 .owner = THIS_MODULE,
189 static int acpi_fan_add_fs(struct acpi_device *device)
191 struct proc_dir_entry *entry = NULL;
197 if (!acpi_device_dir(device)) {
198 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
200 if (!acpi_device_dir(device))
205 entry = proc_create_data(ACPI_FAN_FILE_STATE,
206 S_IFREG | S_IRUGO | S_IWUSR,
207 acpi_device_dir(device),
215 static int acpi_fan_remove_fs(struct acpi_device *device)
218 if (acpi_device_dir(device)) {
219 remove_proc_entry(ACPI_FAN_FILE_STATE, acpi_device_dir(device));
220 remove_proc_entry(acpi_device_bid(device), acpi_fan_dir);
221 acpi_device_dir(device) = NULL;
227 static int acpi_fan_add_fs(struct acpi_device *device)
232 static int acpi_fan_remove_fs(struct acpi_device *device)
237 /* --------------------------------------------------------------------------
239 -------------------------------------------------------------------------- */
241 static int acpi_fan_add(struct acpi_device *device)
245 struct thermal_cooling_device *cdev;
250 strcpy(acpi_device_name(device), "Fan");
251 strcpy(acpi_device_class(device), ACPI_FAN_CLASS);
253 result = acpi_bus_get_power(device->handle, &state);
255 printk(KERN_ERR PREFIX "Reading power state\n");
259 device->flags.force_power_state = 1;
260 acpi_bus_set_power(device->handle, state);
261 device->flags.force_power_state = 0;
263 cdev = thermal_cooling_device_register("Fan", device,
266 result = PTR_ERR(cdev);
270 dev_dbg(&device->dev, "registered as cooling_device%d\n", cdev->id);
272 device->driver_data = cdev;
273 result = sysfs_create_link(&device->dev.kobj,
277 dev_err(&device->dev, "Failed to create sysfs link "
278 "'thermal_cooling'\n");
280 result = sysfs_create_link(&cdev->device.kobj,
284 dev_err(&device->dev, "Failed to create sysfs link "
287 result = acpi_fan_add_fs(device);
291 printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
292 acpi_device_name(device), acpi_device_bid(device),
293 !device->power.state ? "on" : "off");
299 static int acpi_fan_remove(struct acpi_device *device, int type)
301 struct thermal_cooling_device *cdev = acpi_driver_data(device);
303 if (!device || !cdev)
306 acpi_fan_remove_fs(device);
307 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
308 sysfs_remove_link(&cdev->device.kobj, "device");
309 thermal_cooling_device_unregister(cdev);
314 static int acpi_fan_suspend(struct acpi_device *device, pm_message_t state)
319 acpi_bus_set_power(device->handle, ACPI_STATE_D0);
324 static int acpi_fan_resume(struct acpi_device *device)
332 result = acpi_bus_get_power(device->handle, &power_state);
334 printk(KERN_ERR PREFIX
335 "Error reading fan power state\n");
339 device->flags.force_power_state = 1;
340 acpi_bus_set_power(device->handle, power_state);
341 device->flags.force_power_state = 0;
346 static int __init acpi_fan_init(void)
351 #ifdef CONFIG_ACPI_PROCFS
352 acpi_fan_dir = proc_mkdir(ACPI_FAN_CLASS, acpi_root_dir);
357 result = acpi_bus_register_driver(&acpi_fan_driver);
359 remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir);
366 static void __exit acpi_fan_exit(void)
369 acpi_bus_unregister_driver(&acpi_fan_driver);
371 remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir);
376 module_init(acpi_fan_init);
377 module_exit(acpi_fan_exit);