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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_FILE_STATE "state" |
1da177e4 LT |
40 | |
41 | #define _COMPONENT ACPI_FAN_COMPONENT | |
f52fd66d | 42 | ACPI_MODULE_NAME("fan"); |
1da177e4 | 43 | |
f52fd66d | 44 | MODULE_AUTHOR("Paul Diefenbaugh"); |
7cda93e0 | 45 | MODULE_DESCRIPTION("ACPI Fan Driver"); |
1da177e4 LT |
46 | MODULE_LICENSE("GPL"); |
47 | ||
4be44fcd LB |
48 | static int acpi_fan_add(struct acpi_device *device); |
49 | static int acpi_fan_remove(struct acpi_device *device, int type); | |
5d9464a4 PM |
50 | static int acpi_fan_suspend(struct acpi_device *device, pm_message_t state); |
51 | static int acpi_fan_resume(struct acpi_device *device); | |
1da177e4 | 52 | |
1ba90e3a TR |
53 | static const struct acpi_device_id fan_device_ids[] = { |
54 | {"PNP0C0B", 0}, | |
55 | {"", 0}, | |
56 | }; | |
57 | MODULE_DEVICE_TABLE(acpi, fan_device_ids); | |
58 | ||
1da177e4 | 59 | static struct acpi_driver acpi_fan_driver = { |
c2b6705b | 60 | .name = "fan", |
4be44fcd | 61 | .class = ACPI_FAN_CLASS, |
1ba90e3a | 62 | .ids = fan_device_ids, |
4be44fcd LB |
63 | .ops = { |
64 | .add = acpi_fan_add, | |
65 | .remove = acpi_fan_remove, | |
0feabb01 KK |
66 | .suspend = acpi_fan_suspend, |
67 | .resume = acpi_fan_resume, | |
4be44fcd | 68 | }, |
1da177e4 LT |
69 | }; |
70 | ||
71 | struct acpi_fan { | |
74b142e0 | 72 | struct acpi_device * device; |
1da177e4 LT |
73 | }; |
74 | ||
1da177e4 LT |
75 | /* -------------------------------------------------------------------------- |
76 | FS Interface (/proc) | |
77 | -------------------------------------------------------------------------- */ | |
78 | ||
4be44fcd | 79 | static struct proc_dir_entry *acpi_fan_dir; |
1da177e4 | 80 | |
4be44fcd | 81 | static int acpi_fan_read_state(struct seq_file *seq, void *offset) |
1da177e4 | 82 | { |
4be44fcd LB |
83 | struct acpi_fan *fan = seq->private; |
84 | int state = 0; | |
1da177e4 | 85 | |
1da177e4 LT |
86 | |
87 | if (fan) { | |
dc8c2b27 | 88 | if (acpi_bus_get_power(fan->device->handle, &state)) |
1da177e4 LT |
89 | seq_printf(seq, "status: ERROR\n"); |
90 | else | |
91 | seq_printf(seq, "status: %s\n", | |
4be44fcd | 92 | !state ? "on" : "off"); |
1da177e4 | 93 | } |
d550d98d | 94 | return 0; |
1da177e4 LT |
95 | } |
96 | ||
97 | static int acpi_fan_state_open_fs(struct inode *inode, struct file *file) | |
98 | { | |
99 | return single_open(file, acpi_fan_read_state, PDE(inode)->data); | |
100 | } | |
101 | ||
102 | static ssize_t | |
4be44fcd LB |
103 | acpi_fan_write_state(struct file *file, const char __user * buffer, |
104 | size_t count, loff_t * ppos) | |
1da177e4 | 105 | { |
4be44fcd | 106 | int result = 0; |
50dd0969 JE |
107 | struct seq_file *m = file->private_data; |
108 | struct acpi_fan *fan = m->private; | |
4be44fcd | 109 | char state_string[12] = { '\0' }; |
1da177e4 | 110 | |
1da177e4 LT |
111 | |
112 | if (!fan || (count > sizeof(state_string) - 1)) | |
d550d98d | 113 | return -EINVAL; |
4be44fcd | 114 | |
1da177e4 | 115 | if (copy_from_user(state_string, buffer, count)) |
d550d98d | 116 | return -EFAULT; |
4be44fcd | 117 | |
1da177e4 | 118 | state_string[count] = '\0'; |
4be44fcd | 119 | |
dc8c2b27 | 120 | result = acpi_bus_set_power(fan->device->handle, |
4be44fcd | 121 | simple_strtoul(state_string, NULL, 0)); |
1da177e4 | 122 | if (result) |
d550d98d | 123 | return result; |
1da177e4 | 124 | |
d550d98d | 125 | return count; |
1da177e4 LT |
126 | } |
127 | ||
d7508032 | 128 | static const struct file_operations acpi_fan_state_ops = { |
4be44fcd LB |
129 | .open = acpi_fan_state_open_fs, |
130 | .read = seq_read, | |
131 | .write = acpi_fan_write_state, | |
132 | .llseek = seq_lseek, | |
133 | .release = single_release, | |
1da177e4 LT |
134 | .owner = THIS_MODULE, |
135 | }; | |
136 | ||
4be44fcd | 137 | static int acpi_fan_add_fs(struct acpi_device *device) |
1da177e4 | 138 | { |
4be44fcd | 139 | struct proc_dir_entry *entry = NULL; |
1da177e4 | 140 | |
1da177e4 LT |
141 | |
142 | if (!device) | |
d550d98d | 143 | return -EINVAL; |
1da177e4 LT |
144 | |
145 | if (!acpi_device_dir(device)) { | |
146 | acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), | |
4be44fcd | 147 | acpi_fan_dir); |
1da177e4 | 148 | if (!acpi_device_dir(device)) |
d550d98d | 149 | return -ENODEV; |
1da177e4 LT |
150 | acpi_device_dir(device)->owner = THIS_MODULE; |
151 | } | |
152 | ||
153 | /* 'status' [R/W] */ | |
154 | entry = create_proc_entry(ACPI_FAN_FILE_STATE, | |
4be44fcd LB |
155 | S_IFREG | S_IRUGO | S_IWUSR, |
156 | acpi_device_dir(device)); | |
1da177e4 | 157 | if (!entry) |
d550d98d | 158 | return -ENODEV; |
1da177e4 LT |
159 | else { |
160 | entry->proc_fops = &acpi_fan_state_ops; | |
161 | entry->data = acpi_driver_data(device); | |
162 | entry->owner = THIS_MODULE; | |
163 | } | |
164 | ||
d550d98d | 165 | return 0; |
1da177e4 LT |
166 | } |
167 | ||
4be44fcd | 168 | static int acpi_fan_remove_fs(struct acpi_device *device) |
1da177e4 | 169 | { |
1da177e4 LT |
170 | |
171 | if (acpi_device_dir(device)) { | |
4be44fcd | 172 | remove_proc_entry(ACPI_FAN_FILE_STATE, acpi_device_dir(device)); |
1da177e4 LT |
173 | remove_proc_entry(acpi_device_bid(device), acpi_fan_dir); |
174 | acpi_device_dir(device) = NULL; | |
175 | } | |
176 | ||
d550d98d | 177 | return 0; |
1da177e4 LT |
178 | } |
179 | ||
1da177e4 LT |
180 | /* -------------------------------------------------------------------------- |
181 | Driver Interface | |
182 | -------------------------------------------------------------------------- */ | |
183 | ||
4be44fcd | 184 | static int acpi_fan_add(struct acpi_device *device) |
1da177e4 | 185 | { |
4be44fcd LB |
186 | int result = 0; |
187 | struct acpi_fan *fan = NULL; | |
188 | int state = 0; | |
1da177e4 | 189 | |
1da177e4 LT |
190 | |
191 | if (!device) | |
d550d98d | 192 | return -EINVAL; |
1da177e4 | 193 | |
36bcbec7 | 194 | fan = kzalloc(sizeof(struct acpi_fan), GFP_KERNEL); |
1da177e4 | 195 | if (!fan) |
d550d98d | 196 | return -ENOMEM; |
1da177e4 | 197 | |
74b142e0 | 198 | fan->device = device; |
c65ade4d | 199 | strcpy(acpi_device_name(device), "Fan"); |
1da177e4 LT |
200 | strcpy(acpi_device_class(device), ACPI_FAN_CLASS); |
201 | acpi_driver_data(device) = fan; | |
202 | ||
dc8c2b27 | 203 | result = acpi_bus_get_power(device->handle, &state); |
1da177e4 | 204 | if (result) { |
6468463a | 205 | printk(KERN_ERR PREFIX "Reading power state\n"); |
1da177e4 LT |
206 | goto end; |
207 | } | |
208 | ||
0feabb01 KK |
209 | device->flags.force_power_state = 1; |
210 | acpi_bus_set_power(device->handle, state); | |
211 | device->flags.force_power_state = 0; | |
212 | ||
1da177e4 LT |
213 | result = acpi_fan_add_fs(device); |
214 | if (result) | |
215 | goto end; | |
216 | ||
217 | printk(KERN_INFO PREFIX "%s [%s] (%s)\n", | |
4be44fcd LB |
218 | acpi_device_name(device), acpi_device_bid(device), |
219 | !device->power.state ? "on" : "off"); | |
1da177e4 | 220 | |
4be44fcd | 221 | end: |
1da177e4 LT |
222 | if (result) |
223 | kfree(fan); | |
224 | ||
d550d98d | 225 | return result; |
1da177e4 LT |
226 | } |
227 | ||
4be44fcd | 228 | static int acpi_fan_remove(struct acpi_device *device, int type) |
1da177e4 | 229 | { |
c65ade4d | 230 | struct acpi_fan *fan = NULL; |
1da177e4 | 231 | |
1da177e4 LT |
232 | |
233 | if (!device || !acpi_driver_data(device)) | |
d550d98d | 234 | return -EINVAL; |
1da177e4 | 235 | |
50dd0969 | 236 | fan = acpi_driver_data(device); |
1da177e4 LT |
237 | |
238 | acpi_fan_remove_fs(device); | |
239 | ||
240 | kfree(fan); | |
241 | ||
d550d98d | 242 | return 0; |
1da177e4 LT |
243 | } |
244 | ||
5d9464a4 | 245 | static int acpi_fan_suspend(struct acpi_device *device, pm_message_t state) |
0feabb01 KK |
246 | { |
247 | if (!device) | |
248 | return -EINVAL; | |
249 | ||
250 | acpi_bus_set_power(device->handle, ACPI_STATE_D0); | |
251 | ||
252 | return AE_OK; | |
253 | } | |
254 | ||
5d9464a4 | 255 | static int acpi_fan_resume(struct acpi_device *device) |
0feabb01 KK |
256 | { |
257 | int result = 0; | |
258 | int power_state = 0; | |
259 | ||
260 | if (!device) | |
261 | return -EINVAL; | |
262 | ||
263 | result = acpi_bus_get_power(device->handle, &power_state); | |
264 | if (result) { | |
265 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
266 | "Error reading fan power state\n")); | |
267 | return result; | |
268 | } | |
269 | ||
270 | device->flags.force_power_state = 1; | |
271 | acpi_bus_set_power(device->handle, power_state); | |
272 | device->flags.force_power_state = 0; | |
273 | ||
274 | return result; | |
275 | } | |
276 | ||
4be44fcd | 277 | static int __init acpi_fan_init(void) |
1da177e4 | 278 | { |
c65ade4d | 279 | int result = 0; |
1da177e4 | 280 | |
1da177e4 LT |
281 | |
282 | acpi_fan_dir = proc_mkdir(ACPI_FAN_CLASS, acpi_root_dir); | |
283 | if (!acpi_fan_dir) | |
d550d98d | 284 | return -ENODEV; |
1da177e4 LT |
285 | acpi_fan_dir->owner = THIS_MODULE; |
286 | ||
287 | result = acpi_bus_register_driver(&acpi_fan_driver); | |
288 | if (result < 0) { | |
289 | remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir); | |
d550d98d | 290 | return -ENODEV; |
1da177e4 LT |
291 | } |
292 | ||
d550d98d | 293 | return 0; |
1da177e4 LT |
294 | } |
295 | ||
4be44fcd | 296 | static void __exit acpi_fan_exit(void) |
1da177e4 | 297 | { |
1da177e4 LT |
298 | |
299 | acpi_bus_unregister_driver(&acpi_fan_driver); | |
300 | ||
301 | remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir); | |
302 | ||
d550d98d | 303 | return; |
1da177e4 LT |
304 | } |
305 | ||
1da177e4 LT |
306 | module_init(acpi_fan_init); |
307 | module_exit(acpi_fan_exit); |