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 <asm/uaccess.h>
31 #include <linux/thermal.h>
32 #include <acpi/acpi_bus.h>
33 #include <acpi/acpi_drivers.h>
35 #define PREFIX "ACPI: "
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
);
50 static const struct acpi_device_id fan_device_ids
[] = {
54 MODULE_DEVICE_TABLE(acpi
, fan_device_ids
);
56 static int acpi_fan_suspend(struct device
*dev
);
57 static int acpi_fan_resume(struct device
*dev
);
58 static SIMPLE_DEV_PM_OPS(acpi_fan_pm
, acpi_fan_suspend
, acpi_fan_resume
);
60 static struct acpi_driver acpi_fan_driver
= {
62 .class = ACPI_FAN_CLASS
,
63 .ids
= fan_device_ids
,
66 .remove
= acpi_fan_remove
,
68 .drv
.pm
= &acpi_fan_pm
,
71 /* thermal cooling device callbacks */
72 static int fan_get_max_state(struct thermal_cooling_device
*cdev
, unsigned long
75 /* ACPI fan device only support two states: ON/OFF */
80 static int fan_get_cur_state(struct thermal_cooling_device
*cdev
, unsigned long
83 struct acpi_device
*device
= cdev
->devdata
;
90 result
= acpi_bus_update_power(device
->handle
, &acpi_state
);
94 *state
= (acpi_state
== ACPI_STATE_D3
? 0 :
95 (acpi_state
== ACPI_STATE_D0
? 1 : -1));
100 fan_set_cur_state(struct thermal_cooling_device
*cdev
, unsigned long state
)
102 struct acpi_device
*device
= cdev
->devdata
;
105 if (!device
|| (state
!= 0 && state
!= 1))
108 result
= acpi_bus_set_power(device
->handle
,
109 state
? ACPI_STATE_D0
: ACPI_STATE_D3
);
114 static const struct thermal_cooling_device_ops fan_cooling_ops
= {
115 .get_max_state
= fan_get_max_state
,
116 .get_cur_state
= fan_get_cur_state
,
117 .set_cur_state
= fan_set_cur_state
,
120 /* --------------------------------------------------------------------------
122 -------------------------------------------------------------------------- */
124 static int acpi_fan_add(struct acpi_device
*device
)
127 struct thermal_cooling_device
*cdev
;
132 strcpy(acpi_device_name(device
), "Fan");
133 strcpy(acpi_device_class(device
), ACPI_FAN_CLASS
);
135 result
= acpi_bus_update_power(device
->handle
, NULL
);
137 printk(KERN_ERR PREFIX
"Setting initial power state\n");
141 cdev
= thermal_cooling_device_register("Fan", device
,
144 result
= PTR_ERR(cdev
);
148 dev_dbg(&device
->dev
, "registered as cooling_device%d\n", cdev
->id
);
150 device
->driver_data
= cdev
;
151 result
= sysfs_create_link(&device
->dev
.kobj
,
155 dev_err(&device
->dev
, "Failed to create sysfs link "
156 "'thermal_cooling'\n");
158 result
= sysfs_create_link(&cdev
->device
.kobj
,
162 dev_err(&device
->dev
, "Failed to create sysfs link "
165 printk(KERN_INFO PREFIX
"%s [%s] (%s)\n",
166 acpi_device_name(device
), acpi_device_bid(device
),
167 !device
->power
.state
? "on" : "off");
173 static int acpi_fan_remove(struct acpi_device
*device
, int type
)
175 struct thermal_cooling_device
*cdev
= acpi_driver_data(device
);
177 if (!device
|| !cdev
)
180 sysfs_remove_link(&device
->dev
.kobj
, "thermal_cooling");
181 sysfs_remove_link(&cdev
->device
.kobj
, "device");
182 thermal_cooling_device_unregister(cdev
);
187 static int acpi_fan_suspend(struct device
*dev
)
192 acpi_bus_set_power(to_acpi_device(dev
)->handle
, ACPI_STATE_D0
);
197 static int acpi_fan_resume(struct device
*dev
)
204 result
= acpi_bus_update_power(to_acpi_device(dev
)->handle
, NULL
);
206 printk(KERN_ERR PREFIX
"Error updating fan power state\n");
211 static int __init
acpi_fan_init(void)
215 result
= acpi_bus_register_driver(&acpi_fan_driver
);
222 static void __exit
acpi_fan_exit(void)
225 acpi_bus_unregister_driver(&acpi_fan_driver
);
230 module_init(acpi_fan_init
);
231 module_exit(acpi_fan_exit
);