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 ACPI_FAN_CLASS "fan"
38 #define ACPI_FAN_FILE_STATE "state"
40 #define _COMPONENT ACPI_FAN_COMPONENT
41 ACPI_MODULE_NAME("fan");
43 MODULE_AUTHOR("Paul Diefenbaugh");
44 MODULE_DESCRIPTION("ACPI Fan Driver");
45 MODULE_LICENSE("GPL");
47 static int acpi_fan_add(struct acpi_device
*device
);
48 static int acpi_fan_remove(struct acpi_device
*device
, int type
);
49 static int acpi_fan_suspend(struct acpi_device
*device
, pm_message_t state
);
50 static int acpi_fan_resume(struct acpi_device
*device
);
52 static const struct acpi_device_id fan_device_ids
[] = {
56 MODULE_DEVICE_TABLE(acpi
, fan_device_ids
);
58 static struct acpi_driver acpi_fan_driver
= {
60 .class = ACPI_FAN_CLASS
,
61 .ids
= fan_device_ids
,
64 .remove
= acpi_fan_remove
,
65 .suspend
= acpi_fan_suspend
,
66 .resume
= acpi_fan_resume
,
70 /* thermal cooling device callbacks */
71 static int fan_get_max_state(struct thermal_cooling_device
*cdev
, char *buf
)
73 /* ACPI fan device only support two states: ON/OFF */
74 return sprintf(buf
, "1\n");
77 static int fan_get_cur_state(struct thermal_cooling_device
*cdev
, char *buf
)
79 struct acpi_device
*device
= cdev
->devdata
;
86 result
= acpi_bus_get_power(device
->handle
, &state
);
90 return sprintf(buf
, "%s\n", state
== ACPI_STATE_D3
? "0" :
91 (state
== ACPI_STATE_D0
? "1" : "unknown"));
95 fan_set_cur_state(struct thermal_cooling_device
*cdev
, unsigned int state
)
97 struct acpi_device
*device
= cdev
->devdata
;
100 if (!device
|| (state
!= 0 && state
!= 1))
103 result
= acpi_bus_set_power(device
->handle
,
104 state
? ACPI_STATE_D0
: ACPI_STATE_D3
);
109 static struct thermal_cooling_device_ops fan_cooling_ops
= {
110 .get_max_state
= fan_get_max_state
,
111 .get_cur_state
= fan_get_cur_state
,
112 .set_cur_state
= fan_set_cur_state
,
115 /* --------------------------------------------------------------------------
117 -------------------------------------------------------------------------- */
118 #ifdef CONFIG_ACPI_PROCFS
120 static struct proc_dir_entry
*acpi_fan_dir
;
122 static int acpi_fan_read_state(struct seq_file
*seq
, void *offset
)
124 struct acpi_device
*device
= seq
->private;
129 if (acpi_bus_get_power(device
->handle
, &state
))
130 seq_printf(seq
, "status: ERROR\n");
132 seq_printf(seq
, "status: %s\n",
133 !state
? "on" : "off");
138 static int acpi_fan_state_open_fs(struct inode
*inode
, struct file
*file
)
140 return single_open(file
, acpi_fan_read_state
, PDE(inode
)->data
);
144 acpi_fan_write_state(struct file
*file
, const char __user
* buffer
,
145 size_t count
, loff_t
* ppos
)
148 struct seq_file
*m
= file
->private_data
;
149 struct acpi_device
*device
= m
->private;
150 char state_string
[3] = { '\0' };
152 if (count
> sizeof(state_string
) - 1)
155 if (copy_from_user(state_string
, buffer
, count
))
158 state_string
[count
] = '\0';
159 if ((state_string
[0] < '0') || (state_string
[0] > '3'))
161 if (state_string
[1] == '\n')
162 state_string
[1] = '\0';
163 if (state_string
[1] != '\0')
166 result
= acpi_bus_set_power(device
->handle
,
167 simple_strtoul(state_string
, NULL
, 0));
174 static const struct file_operations acpi_fan_state_ops
= {
175 .open
= acpi_fan_state_open_fs
,
177 .write
= acpi_fan_write_state
,
179 .release
= single_release
,
180 .owner
= THIS_MODULE
,
183 static int acpi_fan_add_fs(struct acpi_device
*device
)
185 struct proc_dir_entry
*entry
= NULL
;
191 if (!acpi_device_dir(device
)) {
192 acpi_device_dir(device
) = proc_mkdir(acpi_device_bid(device
),
194 if (!acpi_device_dir(device
))
199 entry
= proc_create_data(ACPI_FAN_FILE_STATE
,
200 S_IFREG
| S_IRUGO
| S_IWUSR
,
201 acpi_device_dir(device
),
209 static int acpi_fan_remove_fs(struct acpi_device
*device
)
212 if (acpi_device_dir(device
)) {
213 remove_proc_entry(ACPI_FAN_FILE_STATE
, acpi_device_dir(device
));
214 remove_proc_entry(acpi_device_bid(device
), acpi_fan_dir
);
215 acpi_device_dir(device
) = NULL
;
221 static int acpi_fan_add_fs(struct acpi_device
*device
)
226 static int acpi_fan_remove_fs(struct acpi_device
*device
)
231 /* --------------------------------------------------------------------------
233 -------------------------------------------------------------------------- */
235 static int acpi_fan_add(struct acpi_device
*device
)
239 struct thermal_cooling_device
*cdev
;
244 strcpy(acpi_device_name(device
), "Fan");
245 strcpy(acpi_device_class(device
), ACPI_FAN_CLASS
);
247 result
= acpi_bus_get_power(device
->handle
, &state
);
249 printk(KERN_ERR PREFIX
"Reading power state\n");
253 device
->flags
.force_power_state
= 1;
254 acpi_bus_set_power(device
->handle
, state
);
255 device
->flags
.force_power_state
= 0;
257 cdev
= thermal_cooling_device_register("Fan", device
,
260 result
= PTR_ERR(cdev
);
264 dev_info(&device
->dev
, "registered as cooling_device%d\n", cdev
->id
);
266 device
->driver_data
= cdev
;
267 result
= sysfs_create_link(&device
->dev
.kobj
,
271 dev_err(&device
->dev
, "Failed to create sysfs link "
272 "'thermal_cooling'\n");
274 result
= sysfs_create_link(&cdev
->device
.kobj
,
278 dev_err(&device
->dev
, "Failed to create sysfs link "
281 result
= acpi_fan_add_fs(device
);
285 printk(KERN_INFO PREFIX
"%s [%s] (%s)\n",
286 acpi_device_name(device
), acpi_device_bid(device
),
287 !device
->power
.state
? "on" : "off");
293 static int acpi_fan_remove(struct acpi_device
*device
, int type
)
295 struct thermal_cooling_device
*cdev
= acpi_driver_data(device
);
297 if (!device
|| !cdev
)
300 acpi_fan_remove_fs(device
);
301 sysfs_remove_link(&device
->dev
.kobj
, "thermal_cooling");
302 sysfs_remove_link(&cdev
->device
.kobj
, "device");
303 thermal_cooling_device_unregister(cdev
);
308 static int acpi_fan_suspend(struct acpi_device
*device
, pm_message_t state
)
313 acpi_bus_set_power(device
->handle
, ACPI_STATE_D0
);
318 static int acpi_fan_resume(struct acpi_device
*device
)
326 result
= acpi_bus_get_power(device
->handle
, &power_state
);
328 printk(KERN_ERR PREFIX
329 "Error reading fan power state\n");
333 device
->flags
.force_power_state
= 1;
334 acpi_bus_set_power(device
->handle
, power_state
);
335 device
->flags
.force_power_state
= 0;
340 static int __init
acpi_fan_init(void)
345 #ifdef CONFIG_ACPI_PROCFS
346 acpi_fan_dir
= proc_mkdir(ACPI_FAN_CLASS
, acpi_root_dir
);
351 result
= acpi_bus_register_driver(&acpi_fan_driver
);
353 remove_proc_entry(ACPI_FAN_CLASS
, acpi_root_dir
);
360 static void __exit
acpi_fan_exit(void)
363 acpi_bus_unregister_driver(&acpi_fan_driver
);
365 remove_proc_entry(ACPI_FAN_CLASS
, acpi_root_dir
);
370 module_init(acpi_fan_init
);
371 module_exit(acpi_fan_exit
);