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1da177e4 LT |
1 | /* |
2 | * acpi_ac.c - ACPI AC Adapter Driver ($Revision: 27 $) | |
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 <acpi/acpi_bus.h> | |
33 | #include <acpi/acpi_drivers.h> | |
34 | ||
1da177e4 LT |
35 | #define ACPI_AC_COMPONENT 0x00020000 |
36 | #define ACPI_AC_CLASS "ac_adapter" | |
37 | #define ACPI_AC_HID "ACPI0003" | |
1da177e4 LT |
38 | #define ACPI_AC_DEVICE_NAME "AC Adapter" |
39 | #define ACPI_AC_FILE_STATE "state" | |
40 | #define ACPI_AC_NOTIFY_STATUS 0x80 | |
41 | #define ACPI_AC_STATUS_OFFLINE 0x00 | |
42 | #define ACPI_AC_STATUS_ONLINE 0x01 | |
43 | #define ACPI_AC_STATUS_UNKNOWN 0xFF | |
44 | ||
45 | #define _COMPONENT ACPI_AC_COMPONENT | |
f52fd66d | 46 | ACPI_MODULE_NAME("ac"); |
1da177e4 | 47 | |
f52fd66d | 48 | MODULE_AUTHOR("Paul Diefenbaugh"); |
7cda93e0 | 49 | MODULE_DESCRIPTION("ACPI AC Adapter Driver"); |
1da177e4 LT |
50 | MODULE_LICENSE("GPL"); |
51 | ||
3f86b832 RT |
52 | extern struct proc_dir_entry *acpi_lock_ac_dir(void); |
53 | extern void *acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir); | |
54 | ||
4be44fcd LB |
55 | static int acpi_ac_add(struct acpi_device *device); |
56 | static int acpi_ac_remove(struct acpi_device *device, int type); | |
1da177e4 LT |
57 | static int acpi_ac_open_fs(struct inode *inode, struct file *file); |
58 | ||
59 | static struct acpi_driver acpi_ac_driver = { | |
c2b6705b | 60 | .name = "ac", |
4be44fcd LB |
61 | .class = ACPI_AC_CLASS, |
62 | .ids = ACPI_AC_HID, | |
63 | .ops = { | |
64 | .add = acpi_ac_add, | |
65 | .remove = acpi_ac_remove, | |
66 | }, | |
1da177e4 LT |
67 | }; |
68 | ||
69 | struct acpi_ac { | |
af96179a | 70 | struct acpi_device * device; |
4be44fcd | 71 | unsigned long state; |
1da177e4 LT |
72 | }; |
73 | ||
d7508032 | 74 | static const struct file_operations acpi_ac_fops = { |
4be44fcd LB |
75 | .open = acpi_ac_open_fs, |
76 | .read = seq_read, | |
77 | .llseek = seq_lseek, | |
78 | .release = single_release, | |
1da177e4 LT |
79 | }; |
80 | ||
81 | /* -------------------------------------------------------------------------- | |
82 | AC Adapter Management | |
83 | -------------------------------------------------------------------------- */ | |
84 | ||
4be44fcd | 85 | static int acpi_ac_get_state(struct acpi_ac *ac) |
1da177e4 | 86 | { |
4be44fcd | 87 | acpi_status status = AE_OK; |
1da177e4 | 88 | |
1da177e4 LT |
89 | |
90 | if (!ac) | |
d550d98d | 91 | return -EINVAL; |
1da177e4 | 92 | |
a6ba5ebe | 93 | status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL, &ac->state); |
1da177e4 | 94 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 95 | ACPI_EXCEPTION((AE_INFO, status, "Error reading AC Adapter state")); |
1da177e4 | 96 | ac->state = ACPI_AC_STATUS_UNKNOWN; |
d550d98d | 97 | return -ENODEV; |
1da177e4 | 98 | } |
4be44fcd | 99 | |
d550d98d | 100 | return 0; |
1da177e4 LT |
101 | } |
102 | ||
1da177e4 LT |
103 | /* -------------------------------------------------------------------------- |
104 | FS Interface (/proc) | |
105 | -------------------------------------------------------------------------- */ | |
106 | ||
4be44fcd | 107 | static struct proc_dir_entry *acpi_ac_dir; |
1da177e4 LT |
108 | |
109 | static int acpi_ac_seq_show(struct seq_file *seq, void *offset) | |
110 | { | |
50dd0969 | 111 | struct acpi_ac *ac = seq->private; |
1da177e4 | 112 | |
1da177e4 LT |
113 | |
114 | if (!ac) | |
d550d98d | 115 | return 0; |
1da177e4 LT |
116 | |
117 | if (acpi_ac_get_state(ac)) { | |
118 | seq_puts(seq, "ERROR: Unable to read AC Adapter state\n"); | |
d550d98d | 119 | return 0; |
1da177e4 LT |
120 | } |
121 | ||
122 | seq_puts(seq, "state: "); | |
123 | switch (ac->state) { | |
124 | case ACPI_AC_STATUS_OFFLINE: | |
125 | seq_puts(seq, "off-line\n"); | |
126 | break; | |
127 | case ACPI_AC_STATUS_ONLINE: | |
128 | seq_puts(seq, "on-line\n"); | |
129 | break; | |
130 | default: | |
131 | seq_puts(seq, "unknown\n"); | |
132 | break; | |
133 | } | |
134 | ||
d550d98d | 135 | return 0; |
1da177e4 | 136 | } |
4be44fcd | 137 | |
1da177e4 LT |
138 | static int acpi_ac_open_fs(struct inode *inode, struct file *file) |
139 | { | |
140 | return single_open(file, acpi_ac_seq_show, PDE(inode)->data); | |
141 | } | |
142 | ||
4be44fcd | 143 | static int acpi_ac_add_fs(struct acpi_device *device) |
1da177e4 | 144 | { |
4be44fcd | 145 | struct proc_dir_entry *entry = NULL; |
1da177e4 | 146 | |
1da177e4 LT |
147 | |
148 | if (!acpi_device_dir(device)) { | |
149 | acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), | |
4be44fcd | 150 | acpi_ac_dir); |
1da177e4 | 151 | if (!acpi_device_dir(device)) |
d550d98d | 152 | return -ENODEV; |
1da177e4 LT |
153 | acpi_device_dir(device)->owner = THIS_MODULE; |
154 | } | |
155 | ||
156 | /* 'state' [R] */ | |
157 | entry = create_proc_entry(ACPI_AC_FILE_STATE, | |
4be44fcd | 158 | S_IRUGO, acpi_device_dir(device)); |
1da177e4 | 159 | if (!entry) |
d550d98d | 160 | return -ENODEV; |
1da177e4 LT |
161 | else { |
162 | entry->proc_fops = &acpi_ac_fops; | |
163 | entry->data = acpi_driver_data(device); | |
164 | entry->owner = THIS_MODULE; | |
165 | } | |
166 | ||
d550d98d | 167 | return 0; |
1da177e4 LT |
168 | } |
169 | ||
4be44fcd | 170 | static int acpi_ac_remove_fs(struct acpi_device *device) |
1da177e4 | 171 | { |
1da177e4 LT |
172 | |
173 | if (acpi_device_dir(device)) { | |
4be44fcd | 174 | remove_proc_entry(ACPI_AC_FILE_STATE, acpi_device_dir(device)); |
1da177e4 LT |
175 | |
176 | remove_proc_entry(acpi_device_bid(device), acpi_ac_dir); | |
177 | acpi_device_dir(device) = NULL; | |
178 | } | |
179 | ||
d550d98d | 180 | return 0; |
1da177e4 LT |
181 | } |
182 | ||
1da177e4 LT |
183 | /* -------------------------------------------------------------------------- |
184 | Driver Model | |
185 | -------------------------------------------------------------------------- */ | |
186 | ||
4be44fcd | 187 | static void acpi_ac_notify(acpi_handle handle, u32 event, void *data) |
1da177e4 | 188 | { |
50dd0969 | 189 | struct acpi_ac *ac = data; |
4be44fcd | 190 | struct acpi_device *device = NULL; |
1da177e4 | 191 | |
1da177e4 LT |
192 | |
193 | if (!ac) | |
d550d98d | 194 | return; |
1da177e4 | 195 | |
af96179a | 196 | device = ac->device; |
1da177e4 LT |
197 | switch (event) { |
198 | case ACPI_AC_NOTIFY_STATUS: | |
03d78252 CL |
199 | case ACPI_NOTIFY_BUS_CHECK: |
200 | case ACPI_NOTIFY_DEVICE_CHECK: | |
1da177e4 LT |
201 | acpi_ac_get_state(ac); |
202 | acpi_bus_generate_event(device, event, (u32) ac->state); | |
203 | break; | |
204 | default: | |
205 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 206 | "Unsupported event [0x%x]\n", event)); |
1da177e4 LT |
207 | break; |
208 | } | |
209 | ||
d550d98d | 210 | return; |
1da177e4 LT |
211 | } |
212 | ||
4be44fcd | 213 | static int acpi_ac_add(struct acpi_device *device) |
1da177e4 | 214 | { |
4be44fcd LB |
215 | int result = 0; |
216 | acpi_status status = AE_OK; | |
217 | struct acpi_ac *ac = NULL; | |
1da177e4 | 218 | |
1da177e4 LT |
219 | |
220 | if (!device) | |
d550d98d | 221 | return -EINVAL; |
1da177e4 | 222 | |
36bcbec7 | 223 | ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL); |
1da177e4 | 224 | if (!ac) |
d550d98d | 225 | return -ENOMEM; |
1da177e4 | 226 | |
af96179a | 227 | ac->device = device; |
1da177e4 LT |
228 | strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME); |
229 | strcpy(acpi_device_class(device), ACPI_AC_CLASS); | |
230 | acpi_driver_data(device) = ac; | |
231 | ||
232 | result = acpi_ac_get_state(ac); | |
233 | if (result) | |
234 | goto end; | |
235 | ||
236 | result = acpi_ac_add_fs(device); | |
237 | if (result) | |
238 | goto end; | |
239 | ||
a6ba5ebe | 240 | status = acpi_install_notify_handler(device->handle, |
03d78252 | 241 | ACPI_ALL_NOTIFY, acpi_ac_notify, |
4be44fcd | 242 | ac); |
1da177e4 | 243 | if (ACPI_FAILURE(status)) { |
1da177e4 LT |
244 | result = -ENODEV; |
245 | goto end; | |
246 | } | |
247 | ||
4be44fcd LB |
248 | printk(KERN_INFO PREFIX "%s [%s] (%s)\n", |
249 | acpi_device_name(device), acpi_device_bid(device), | |
250 | ac->state ? "on-line" : "off-line"); | |
1da177e4 | 251 | |
4be44fcd | 252 | end: |
1da177e4 LT |
253 | if (result) { |
254 | acpi_ac_remove_fs(device); | |
255 | kfree(ac); | |
256 | } | |
257 | ||
d550d98d | 258 | return result; |
1da177e4 LT |
259 | } |
260 | ||
4be44fcd | 261 | static int acpi_ac_remove(struct acpi_device *device, int type) |
1da177e4 | 262 | { |
4be44fcd LB |
263 | acpi_status status = AE_OK; |
264 | struct acpi_ac *ac = NULL; | |
1da177e4 | 265 | |
1da177e4 LT |
266 | |
267 | if (!device || !acpi_driver_data(device)) | |
d550d98d | 268 | return -EINVAL; |
1da177e4 | 269 | |
50dd0969 | 270 | ac = acpi_driver_data(device); |
1da177e4 | 271 | |
a6ba5ebe | 272 | status = acpi_remove_notify_handler(device->handle, |
03d78252 | 273 | ACPI_ALL_NOTIFY, acpi_ac_notify); |
1da177e4 LT |
274 | |
275 | acpi_ac_remove_fs(device); | |
276 | ||
277 | kfree(ac); | |
278 | ||
d550d98d | 279 | return 0; |
1da177e4 LT |
280 | } |
281 | ||
4be44fcd | 282 | static int __init acpi_ac_init(void) |
1da177e4 | 283 | { |
3f86b832 | 284 | int result; |
1da177e4 | 285 | |
4d8316d5 PM |
286 | if (acpi_disabled) |
287 | return -ENODEV; | |
1da177e4 | 288 | |
3f86b832 | 289 | acpi_ac_dir = acpi_lock_ac_dir(); |
1da177e4 | 290 | if (!acpi_ac_dir) |
d550d98d | 291 | return -ENODEV; |
1da177e4 LT |
292 | |
293 | result = acpi_bus_register_driver(&acpi_ac_driver); | |
294 | if (result < 0) { | |
3f86b832 | 295 | acpi_unlock_ac_dir(acpi_ac_dir); |
d550d98d | 296 | return -ENODEV; |
1da177e4 LT |
297 | } |
298 | ||
d550d98d | 299 | return 0; |
1da177e4 LT |
300 | } |
301 | ||
4be44fcd | 302 | static void __exit acpi_ac_exit(void) |
1da177e4 | 303 | { |
1da177e4 LT |
304 | |
305 | acpi_bus_unregister_driver(&acpi_ac_driver); | |
306 | ||
3f86b832 | 307 | acpi_unlock_ac_dir(acpi_ac_dir); |
1da177e4 | 308 | |
d550d98d | 309 | return; |
1da177e4 LT |
310 | } |
311 | ||
1da177e4 LT |
312 | module_init(acpi_ac_init); |
313 | module_exit(acpi_ac_exit); |