x86/xen: resume timer irqs early
[linux/fpc-iii.git] / drivers / acpi / fan.c
blob41ade6570bc07c22c3c40445d696aea26e4e4c41
1 /*
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);
50 static const struct acpi_device_id fan_device_ids[] = {
51 {"PNP0C0B", 0},
52 {"", 0},
54 MODULE_DEVICE_TABLE(acpi, fan_device_ids);
56 #ifdef CONFIG_PM_SLEEP
57 static int acpi_fan_suspend(struct device *dev);
58 static int acpi_fan_resume(struct device *dev);
59 #endif
60 static SIMPLE_DEV_PM_OPS(acpi_fan_pm, acpi_fan_suspend, acpi_fan_resume);
62 static struct acpi_driver acpi_fan_driver = {
63 .name = "fan",
64 .class = ACPI_FAN_CLASS,
65 .ids = fan_device_ids,
66 .ops = {
67 .add = acpi_fan_add,
68 .remove = acpi_fan_remove,
70 .drv.pm = &acpi_fan_pm,
73 /* thermal cooling device callbacks */
74 static int fan_get_max_state(struct thermal_cooling_device *cdev, unsigned long
75 *state)
77 /* ACPI fan device only support two states: ON/OFF */
78 *state = 1;
79 return 0;
82 static int fan_get_cur_state(struct thermal_cooling_device *cdev, unsigned long
83 *state)
85 struct acpi_device *device = cdev->devdata;
86 int result;
87 int acpi_state = ACPI_STATE_D0;
89 if (!device)
90 return -EINVAL;
92 result = acpi_bus_update_power(device->handle, &acpi_state);
93 if (result)
94 return result;
96 *state = (acpi_state == ACPI_STATE_D3_COLD ? 0 :
97 (acpi_state == ACPI_STATE_D0 ? 1 : -1));
98 return 0;
101 static int
102 fan_set_cur_state(struct thermal_cooling_device *cdev, unsigned long state)
104 struct acpi_device *device = cdev->devdata;
105 int result;
107 if (!device || (state != 0 && state != 1))
108 return -EINVAL;
110 result = acpi_bus_set_power(device->handle,
111 state ? ACPI_STATE_D0 : ACPI_STATE_D3_COLD);
113 return result;
116 static const struct thermal_cooling_device_ops fan_cooling_ops = {
117 .get_max_state = fan_get_max_state,
118 .get_cur_state = fan_get_cur_state,
119 .set_cur_state = fan_set_cur_state,
122 /* --------------------------------------------------------------------------
123 Driver Interface
124 -------------------------------------------------------------------------- */
126 static int acpi_fan_add(struct acpi_device *device)
128 int result = 0;
129 struct thermal_cooling_device *cdev;
131 if (!device)
132 return -EINVAL;
134 strcpy(acpi_device_name(device), "Fan");
135 strcpy(acpi_device_class(device), ACPI_FAN_CLASS);
137 result = acpi_bus_update_power(device->handle, NULL);
138 if (result) {
139 printk(KERN_ERR PREFIX "Setting initial power state\n");
140 goto end;
143 cdev = thermal_cooling_device_register("Fan", device,
144 &fan_cooling_ops);
145 if (IS_ERR(cdev)) {
146 result = PTR_ERR(cdev);
147 goto end;
150 dev_dbg(&device->dev, "registered as cooling_device%d\n", cdev->id);
152 device->driver_data = cdev;
153 result = sysfs_create_link(&device->dev.kobj,
154 &cdev->device.kobj,
155 "thermal_cooling");
156 if (result)
157 dev_err(&device->dev, "Failed to create sysfs link "
158 "'thermal_cooling'\n");
160 result = sysfs_create_link(&cdev->device.kobj,
161 &device->dev.kobj,
162 "device");
163 if (result)
164 dev_err(&device->dev, "Failed to create sysfs link "
165 "'device'\n");
167 printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
168 acpi_device_name(device), acpi_device_bid(device),
169 !device->power.state ? "on" : "off");
171 end:
172 return result;
175 static int acpi_fan_remove(struct acpi_device *device)
177 struct thermal_cooling_device *cdev;
179 if (!device)
180 return -EINVAL;
182 cdev = acpi_driver_data(device);
183 if (!cdev)
184 return -EINVAL;
186 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
187 sysfs_remove_link(&cdev->device.kobj, "device");
188 thermal_cooling_device_unregister(cdev);
190 return 0;
193 #ifdef CONFIG_PM_SLEEP
194 static int acpi_fan_suspend(struct device *dev)
196 if (!dev)
197 return -EINVAL;
199 acpi_bus_set_power(to_acpi_device(dev)->handle, ACPI_STATE_D0);
201 return AE_OK;
204 static int acpi_fan_resume(struct device *dev)
206 int result;
208 if (!dev)
209 return -EINVAL;
211 result = acpi_bus_update_power(to_acpi_device(dev)->handle, NULL);
212 if (result)
213 printk(KERN_ERR PREFIX "Error updating fan power state\n");
215 return result;
217 #endif
219 module_acpi_driver(acpi_fan_driver);