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1da177e4 LT |
1 | /* |
2 | * acpi_fan.c - ACPI Fan Driver ($Revision: 29 $) | |
3 | * | |
4 | * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> | |
5 | * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> | |
6 | * | |
7 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
8 | * | |
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. | |
13 | * | |
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. | |
18 | * | |
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. | |
22 | * | |
23 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
24 | */ | |
25 | ||
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 | ||
34 | #include <acpi/acpi_bus.h> | |
35 | #include <acpi/acpi_drivers.h> | |
36 | ||
1da177e4 LT |
37 | #define ACPI_FAN_COMPONENT 0x00200000 |
38 | #define ACPI_FAN_CLASS "fan" | |
1da177e4 | 39 | #define ACPI_FAN_DRIVER_NAME "ACPI Fan Driver" |
1da177e4 | 40 | #define ACPI_FAN_FILE_STATE "state" |
1da177e4 LT |
41 | |
42 | #define _COMPONENT ACPI_FAN_COMPONENT | |
4be44fcd | 43 | ACPI_MODULE_NAME("acpi_fan") |
1da177e4 | 44 | |
4be44fcd | 45 | MODULE_AUTHOR("Paul Diefenbaugh"); |
1da177e4 LT |
46 | MODULE_DESCRIPTION(ACPI_FAN_DRIVER_NAME); |
47 | MODULE_LICENSE("GPL"); | |
48 | ||
4be44fcd LB |
49 | static int acpi_fan_add(struct acpi_device *device); |
50 | static int acpi_fan_remove(struct acpi_device *device, int type); | |
1da177e4 LT |
51 | |
52 | static struct acpi_driver acpi_fan_driver = { | |
4be44fcd LB |
53 | .name = ACPI_FAN_DRIVER_NAME, |
54 | .class = ACPI_FAN_CLASS, | |
55 | .ids = "PNP0C0B", | |
56 | .ops = { | |
57 | .add = acpi_fan_add, | |
58 | .remove = acpi_fan_remove, | |
59 | }, | |
1da177e4 LT |
60 | }; |
61 | ||
62 | struct acpi_fan { | |
4be44fcd | 63 | acpi_handle handle; |
1da177e4 LT |
64 | }; |
65 | ||
1da177e4 LT |
66 | /* -------------------------------------------------------------------------- |
67 | FS Interface (/proc) | |
68 | -------------------------------------------------------------------------- */ | |
69 | ||
4be44fcd | 70 | static struct proc_dir_entry *acpi_fan_dir; |
1da177e4 | 71 | |
4be44fcd | 72 | static int acpi_fan_read_state(struct seq_file *seq, void *offset) |
1da177e4 | 73 | { |
4be44fcd LB |
74 | struct acpi_fan *fan = seq->private; |
75 | int state = 0; | |
1da177e4 LT |
76 | |
77 | ACPI_FUNCTION_TRACE("acpi_fan_read_state"); | |
78 | ||
79 | if (fan) { | |
80 | if (acpi_bus_get_power(fan->handle, &state)) | |
81 | seq_printf(seq, "status: ERROR\n"); | |
82 | else | |
83 | seq_printf(seq, "status: %s\n", | |
4be44fcd | 84 | !state ? "on" : "off"); |
1da177e4 LT |
85 | } |
86 | return_VALUE(0); | |
87 | } | |
88 | ||
89 | static int acpi_fan_state_open_fs(struct inode *inode, struct file *file) | |
90 | { | |
91 | return single_open(file, acpi_fan_read_state, PDE(inode)->data); | |
92 | } | |
93 | ||
94 | static ssize_t | |
4be44fcd LB |
95 | acpi_fan_write_state(struct file *file, const char __user * buffer, |
96 | size_t count, loff_t * ppos) | |
1da177e4 | 97 | { |
4be44fcd LB |
98 | int result = 0; |
99 | struct seq_file *m = (struct seq_file *)file->private_data; | |
100 | struct acpi_fan *fan = (struct acpi_fan *)m->private; | |
101 | char state_string[12] = { '\0' }; | |
1da177e4 LT |
102 | |
103 | ACPI_FUNCTION_TRACE("acpi_fan_write_state"); | |
104 | ||
105 | if (!fan || (count > sizeof(state_string) - 1)) | |
106 | return_VALUE(-EINVAL); | |
4be44fcd | 107 | |
1da177e4 LT |
108 | if (copy_from_user(state_string, buffer, count)) |
109 | return_VALUE(-EFAULT); | |
4be44fcd | 110 | |
1da177e4 | 111 | state_string[count] = '\0'; |
4be44fcd LB |
112 | |
113 | result = acpi_bus_set_power(fan->handle, | |
114 | simple_strtoul(state_string, NULL, 0)); | |
1da177e4 LT |
115 | if (result) |
116 | return_VALUE(result); | |
117 | ||
118 | return_VALUE(count); | |
119 | } | |
120 | ||
121 | static struct file_operations acpi_fan_state_ops = { | |
4be44fcd LB |
122 | .open = acpi_fan_state_open_fs, |
123 | .read = seq_read, | |
124 | .write = acpi_fan_write_state, | |
125 | .llseek = seq_lseek, | |
126 | .release = single_release, | |
1da177e4 LT |
127 | .owner = THIS_MODULE, |
128 | }; | |
129 | ||
4be44fcd | 130 | static int acpi_fan_add_fs(struct acpi_device *device) |
1da177e4 | 131 | { |
4be44fcd | 132 | struct proc_dir_entry *entry = NULL; |
1da177e4 LT |
133 | |
134 | ACPI_FUNCTION_TRACE("acpi_fan_add_fs"); | |
135 | ||
136 | if (!device) | |
137 | return_VALUE(-EINVAL); | |
138 | ||
139 | if (!acpi_device_dir(device)) { | |
140 | acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), | |
4be44fcd | 141 | acpi_fan_dir); |
1da177e4 LT |
142 | if (!acpi_device_dir(device)) |
143 | return_VALUE(-ENODEV); | |
144 | acpi_device_dir(device)->owner = THIS_MODULE; | |
145 | } | |
146 | ||
147 | /* 'status' [R/W] */ | |
148 | entry = create_proc_entry(ACPI_FAN_FILE_STATE, | |
4be44fcd LB |
149 | S_IFREG | S_IRUGO | S_IWUSR, |
150 | acpi_device_dir(device)); | |
1da177e4 LT |
151 | if (!entry) |
152 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
4be44fcd LB |
153 | "Unable to create '%s' fs entry\n", |
154 | ACPI_FAN_FILE_STATE)); | |
1da177e4 LT |
155 | else { |
156 | entry->proc_fops = &acpi_fan_state_ops; | |
157 | entry->data = acpi_driver_data(device); | |
158 | entry->owner = THIS_MODULE; | |
159 | } | |
160 | ||
161 | return_VALUE(0); | |
162 | } | |
163 | ||
4be44fcd | 164 | static int acpi_fan_remove_fs(struct acpi_device *device) |
1da177e4 LT |
165 | { |
166 | ACPI_FUNCTION_TRACE("acpi_fan_remove_fs"); | |
167 | ||
168 | if (acpi_device_dir(device)) { | |
4be44fcd | 169 | remove_proc_entry(ACPI_FAN_FILE_STATE, acpi_device_dir(device)); |
1da177e4 LT |
170 | remove_proc_entry(acpi_device_bid(device), acpi_fan_dir); |
171 | acpi_device_dir(device) = NULL; | |
172 | } | |
173 | ||
174 | return_VALUE(0); | |
175 | } | |
176 | ||
1da177e4 LT |
177 | /* -------------------------------------------------------------------------- |
178 | Driver Interface | |
179 | -------------------------------------------------------------------------- */ | |
180 | ||
4be44fcd | 181 | static int acpi_fan_add(struct acpi_device *device) |
1da177e4 | 182 | { |
4be44fcd LB |
183 | int result = 0; |
184 | struct acpi_fan *fan = NULL; | |
185 | int state = 0; | |
1da177e4 LT |
186 | |
187 | ACPI_FUNCTION_TRACE("acpi_fan_add"); | |
188 | ||
189 | if (!device) | |
190 | return_VALUE(-EINVAL); | |
191 | ||
192 | fan = kmalloc(sizeof(struct acpi_fan), GFP_KERNEL); | |
193 | if (!fan) | |
194 | return_VALUE(-ENOMEM); | |
195 | memset(fan, 0, sizeof(struct acpi_fan)); | |
196 | ||
197 | fan->handle = device->handle; | |
c65ade4d | 198 | strcpy(acpi_device_name(device), "Fan"); |
1da177e4 LT |
199 | strcpy(acpi_device_class(device), ACPI_FAN_CLASS); |
200 | acpi_driver_data(device) = fan; | |
201 | ||
202 | result = acpi_bus_get_power(fan->handle, &state); | |
203 | if (result) { | |
204 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
4be44fcd | 205 | "Error reading power state\n")); |
1da177e4 LT |
206 | goto end; |
207 | } | |
208 | ||
209 | result = acpi_fan_add_fs(device); | |
210 | if (result) | |
211 | goto end; | |
212 | ||
213 | printk(KERN_INFO PREFIX "%s [%s] (%s)\n", | |
4be44fcd LB |
214 | acpi_device_name(device), acpi_device_bid(device), |
215 | !device->power.state ? "on" : "off"); | |
1da177e4 | 216 | |
4be44fcd | 217 | end: |
1da177e4 LT |
218 | if (result) |
219 | kfree(fan); | |
220 | ||
221 | return_VALUE(result); | |
222 | } | |
223 | ||
4be44fcd | 224 | static int acpi_fan_remove(struct acpi_device *device, int type) |
1da177e4 | 225 | { |
c65ade4d | 226 | struct acpi_fan *fan = NULL; |
1da177e4 LT |
227 | |
228 | ACPI_FUNCTION_TRACE("acpi_fan_remove"); | |
229 | ||
230 | if (!device || !acpi_driver_data(device)) | |
231 | return_VALUE(-EINVAL); | |
232 | ||
4be44fcd | 233 | fan = (struct acpi_fan *)acpi_driver_data(device); |
1da177e4 LT |
234 | |
235 | acpi_fan_remove_fs(device); | |
236 | ||
237 | kfree(fan); | |
238 | ||
239 | return_VALUE(0); | |
240 | } | |
241 | ||
4be44fcd | 242 | static int __init acpi_fan_init(void) |
1da177e4 | 243 | { |
c65ade4d | 244 | int result = 0; |
1da177e4 LT |
245 | |
246 | ACPI_FUNCTION_TRACE("acpi_fan_init"); | |
247 | ||
248 | acpi_fan_dir = proc_mkdir(ACPI_FAN_CLASS, acpi_root_dir); | |
249 | if (!acpi_fan_dir) | |
250 | return_VALUE(-ENODEV); | |
251 | acpi_fan_dir->owner = THIS_MODULE; | |
252 | ||
253 | result = acpi_bus_register_driver(&acpi_fan_driver); | |
254 | if (result < 0) { | |
255 | remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir); | |
256 | return_VALUE(-ENODEV); | |
257 | } | |
258 | ||
259 | return_VALUE(0); | |
260 | } | |
261 | ||
4be44fcd | 262 | static void __exit acpi_fan_exit(void) |
1da177e4 LT |
263 | { |
264 | ACPI_FUNCTION_TRACE("acpi_fan_exit"); | |
265 | ||
266 | acpi_bus_unregister_driver(&acpi_fan_driver); | |
267 | ||
268 | remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir); | |
269 | ||
270 | return_VOID; | |
271 | } | |
272 | ||
1da177e4 LT |
273 | module_init(acpi_fan_init); |
274 | module_exit(acpi_fan_exit); |