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 <linux/acpi.h>
34 #define PREFIX "ACPI: "
36 #define ACPI_FAN_CLASS "fan"
37 #define ACPI_FAN_FILE_STATE "state"
39 #define _COMPONENT ACPI_FAN_COMPONENT
40 ACPI_MODULE_NAME("fan");
42 MODULE_AUTHOR("Paul Diefenbaugh");
43 MODULE_DESCRIPTION("ACPI Fan Driver");
44 MODULE_LICENSE("GPL");
46 static int acpi_fan_add(struct acpi_device
*device
);
47 static int acpi_fan_remove(struct acpi_device
*device
);
49 static const struct acpi_device_id fan_device_ids
[] = {
53 MODULE_DEVICE_TABLE(acpi
, fan_device_ids
);
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
,
64 #define FAN_PM_OPS_PTR (&acpi_fan_pm)
66 #define FAN_PM_OPS_PTR NULL
69 static struct acpi_driver acpi_fan_driver
= {
71 .class = ACPI_FAN_CLASS
,
72 .ids
= fan_device_ids
,
75 .remove
= acpi_fan_remove
,
77 .drv
.pm
= FAN_PM_OPS_PTR
,
80 /* thermal cooling device callbacks */
81 static int fan_get_max_state(struct thermal_cooling_device
*cdev
, unsigned long
84 /* ACPI fan device only support two states: ON/OFF */
89 static int fan_get_cur_state(struct thermal_cooling_device
*cdev
, unsigned long
92 struct acpi_device
*device
= cdev
->devdata
;
94 int acpi_state
= ACPI_STATE_D0
;
99 result
= acpi_bus_update_power(device
->handle
, &acpi_state
);
103 *state
= (acpi_state
== ACPI_STATE_D3_COLD
? 0 :
104 (acpi_state
== ACPI_STATE_D0
? 1 : -1));
109 fan_set_cur_state(struct thermal_cooling_device
*cdev
, unsigned long state
)
111 struct acpi_device
*device
= cdev
->devdata
;
114 if (!device
|| (state
!= 0 && state
!= 1))
117 result
= acpi_bus_set_power(device
->handle
,
118 state
? ACPI_STATE_D0
: ACPI_STATE_D3_COLD
);
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
,
129 /* --------------------------------------------------------------------------
131 -------------------------------------------------------------------------- */
133 static int acpi_fan_add(struct acpi_device
*device
)
136 struct thermal_cooling_device
*cdev
;
141 strcpy(acpi_device_name(device
), "Fan");
142 strcpy(acpi_device_class(device
), ACPI_FAN_CLASS
);
144 result
= acpi_bus_update_power(device
->handle
, NULL
);
146 printk(KERN_ERR PREFIX
"Setting initial power state\n");
150 cdev
= thermal_cooling_device_register("Fan", device
,
153 result
= PTR_ERR(cdev
);
157 dev_dbg(&device
->dev
, "registered as cooling_device%d\n", cdev
->id
);
159 device
->driver_data
= cdev
;
160 result
= sysfs_create_link(&device
->dev
.kobj
,
164 dev_err(&device
->dev
, "Failed to create sysfs link "
165 "'thermal_cooling'\n");
167 result
= sysfs_create_link(&cdev
->device
.kobj
,
171 dev_err(&device
->dev
, "Failed to create sysfs link "
174 printk(KERN_INFO PREFIX
"%s [%s] (%s)\n",
175 acpi_device_name(device
), acpi_device_bid(device
),
176 !device
->power
.state
? "on" : "off");
182 static int acpi_fan_remove(struct acpi_device
*device
)
184 struct thermal_cooling_device
*cdev
;
189 cdev
= acpi_driver_data(device
);
193 sysfs_remove_link(&device
->dev
.kobj
, "thermal_cooling");
194 sysfs_remove_link(&cdev
->device
.kobj
, "device");
195 thermal_cooling_device_unregister(cdev
);
200 #ifdef CONFIG_PM_SLEEP
201 static int acpi_fan_suspend(struct device
*dev
)
206 acpi_bus_set_power(to_acpi_device(dev
)->handle
, ACPI_STATE_D0
);
211 static int acpi_fan_resume(struct device
*dev
)
218 result
= acpi_bus_update_power(to_acpi_device(dev
)->handle
, NULL
);
220 printk(KERN_ERR PREFIX
"Error updating fan power state\n");
226 module_acpi_driver(acpi_fan_driver
);