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