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