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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 { | |
4be44fcd LB |
68 | acpi_handle handle; |
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 LT |
86 | |
87 | ACPI_FUNCTION_TRACE("acpi_ac_get_state"); | |
88 | ||
89 | if (!ac) | |
90 | return_VALUE(-EINVAL); | |
91 | ||
92 | status = acpi_evaluate_integer(ac->handle, "_PSR", NULL, &ac->state); | |
93 | if (ACPI_FAILURE(status)) { | |
94 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
4be44fcd | 95 | "Error reading AC Adapter state\n")); |
1da177e4 LT |
96 | ac->state = ACPI_AC_STATUS_UNKNOWN; |
97 | return_VALUE(-ENODEV); | |
98 | } | |
4be44fcd | 99 | |
1da177e4 LT |
100 | return_VALUE(0); |
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 | { | |
4be44fcd | 111 | struct acpi_ac *ac = (struct acpi_ac *)seq->private; |
1da177e4 LT |
112 | |
113 | ACPI_FUNCTION_TRACE("acpi_ac_seq_show"); | |
114 | ||
115 | if (!ac) | |
116 | return_VALUE(0); | |
117 | ||
118 | if (acpi_ac_get_state(ac)) { | |
119 | seq_puts(seq, "ERROR: Unable to read AC Adapter state\n"); | |
120 | return_VALUE(0); | |
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 | ||
136 | return_VALUE(0); | |
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 LT |
147 | |
148 | ACPI_FUNCTION_TRACE("acpi_ac_add_fs"); | |
149 | ||
150 | if (!acpi_device_dir(device)) { | |
151 | acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), | |
4be44fcd | 152 | acpi_ac_dir); |
1da177e4 LT |
153 | if (!acpi_device_dir(device)) |
154 | return_VALUE(-ENODEV); | |
155 | acpi_device_dir(device)->owner = THIS_MODULE; | |
156 | } | |
157 | ||
158 | /* 'state' [R] */ | |
159 | entry = create_proc_entry(ACPI_AC_FILE_STATE, | |
4be44fcd | 160 | S_IRUGO, acpi_device_dir(device)); |
1da177e4 LT |
161 | if (!entry) |
162 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
4be44fcd LB |
163 | "Unable to create '%s' fs entry\n", |
164 | ACPI_AC_FILE_STATE)); | |
1da177e4 LT |
165 | else { |
166 | entry->proc_fops = &acpi_ac_fops; | |
167 | entry->data = acpi_driver_data(device); | |
168 | entry->owner = THIS_MODULE; | |
169 | } | |
170 | ||
171 | return_VALUE(0); | |
172 | } | |
173 | ||
4be44fcd | 174 | static int acpi_ac_remove_fs(struct acpi_device *device) |
1da177e4 LT |
175 | { |
176 | ACPI_FUNCTION_TRACE("acpi_ac_remove_fs"); | |
177 | ||
178 | if (acpi_device_dir(device)) { | |
4be44fcd | 179 | remove_proc_entry(ACPI_AC_FILE_STATE, acpi_device_dir(device)); |
1da177e4 LT |
180 | |
181 | remove_proc_entry(acpi_device_bid(device), acpi_ac_dir); | |
182 | acpi_device_dir(device) = NULL; | |
183 | } | |
184 | ||
185 | return_VALUE(0); | |
186 | } | |
187 | ||
1da177e4 LT |
188 | /* -------------------------------------------------------------------------- |
189 | Driver Model | |
190 | -------------------------------------------------------------------------- */ | |
191 | ||
4be44fcd | 192 | static void acpi_ac_notify(acpi_handle handle, u32 event, void *data) |
1da177e4 | 193 | { |
4be44fcd LB |
194 | struct acpi_ac *ac = (struct acpi_ac *)data; |
195 | struct acpi_device *device = NULL; | |
1da177e4 LT |
196 | |
197 | ACPI_FUNCTION_TRACE("acpi_ac_notify"); | |
198 | ||
199 | if (!ac) | |
200 | return_VOID; | |
201 | ||
202 | if (acpi_bus_get_device(ac->handle, &device)) | |
203 | return_VOID; | |
204 | ||
205 | switch (event) { | |
206 | case ACPI_AC_NOTIFY_STATUS: | |
207 | acpi_ac_get_state(ac); | |
208 | acpi_bus_generate_event(device, event, (u32) ac->state); | |
209 | break; | |
210 | default: | |
211 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 212 | "Unsupported event [0x%x]\n", event)); |
1da177e4 LT |
213 | break; |
214 | } | |
215 | ||
216 | return_VOID; | |
217 | } | |
218 | ||
4be44fcd | 219 | static int acpi_ac_add(struct acpi_device *device) |
1da177e4 | 220 | { |
4be44fcd LB |
221 | int result = 0; |
222 | acpi_status status = AE_OK; | |
223 | struct acpi_ac *ac = NULL; | |
1da177e4 LT |
224 | |
225 | ACPI_FUNCTION_TRACE("acpi_ac_add"); | |
226 | ||
227 | if (!device) | |
228 | return_VALUE(-EINVAL); | |
229 | ||
230 | ac = kmalloc(sizeof(struct acpi_ac), GFP_KERNEL); | |
231 | if (!ac) | |
232 | return_VALUE(-ENOMEM); | |
233 | memset(ac, 0, sizeof(struct acpi_ac)); | |
234 | ||
235 | ac->handle = device->handle; | |
236 | strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME); | |
237 | strcpy(acpi_device_class(device), ACPI_AC_CLASS); | |
238 | acpi_driver_data(device) = ac; | |
239 | ||
240 | result = acpi_ac_get_state(ac); | |
241 | if (result) | |
242 | goto end; | |
243 | ||
244 | result = acpi_ac_add_fs(device); | |
245 | if (result) | |
246 | goto end; | |
247 | ||
248 | status = acpi_install_notify_handler(ac->handle, | |
4be44fcd LB |
249 | ACPI_DEVICE_NOTIFY, acpi_ac_notify, |
250 | ac); | |
1da177e4 LT |
251 | if (ACPI_FAILURE(status)) { |
252 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
4be44fcd | 253 | "Error installing notify handler\n")); |
1da177e4 LT |
254 | result = -ENODEV; |
255 | goto end; | |
256 | } | |
257 | ||
4be44fcd LB |
258 | printk(KERN_INFO PREFIX "%s [%s] (%s)\n", |
259 | acpi_device_name(device), acpi_device_bid(device), | |
260 | ac->state ? "on-line" : "off-line"); | |
1da177e4 | 261 | |
4be44fcd | 262 | end: |
1da177e4 LT |
263 | if (result) { |
264 | acpi_ac_remove_fs(device); | |
265 | kfree(ac); | |
266 | } | |
267 | ||
268 | return_VALUE(result); | |
269 | } | |
270 | ||
4be44fcd | 271 | static int acpi_ac_remove(struct acpi_device *device, int type) |
1da177e4 | 272 | { |
4be44fcd LB |
273 | acpi_status status = AE_OK; |
274 | struct acpi_ac *ac = NULL; | |
1da177e4 LT |
275 | |
276 | ACPI_FUNCTION_TRACE("acpi_ac_remove"); | |
277 | ||
278 | if (!device || !acpi_driver_data(device)) | |
279 | return_VALUE(-EINVAL); | |
280 | ||
4be44fcd | 281 | ac = (struct acpi_ac *)acpi_driver_data(device); |
1da177e4 LT |
282 | |
283 | status = acpi_remove_notify_handler(ac->handle, | |
4be44fcd | 284 | ACPI_DEVICE_NOTIFY, acpi_ac_notify); |
1da177e4 LT |
285 | if (ACPI_FAILURE(status)) |
286 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
4be44fcd | 287 | "Error removing notify handler\n")); |
1da177e4 LT |
288 | |
289 | acpi_ac_remove_fs(device); | |
290 | ||
291 | kfree(ac); | |
292 | ||
293 | return_VALUE(0); | |
294 | } | |
295 | ||
4be44fcd | 296 | static int __init acpi_ac_init(void) |
1da177e4 | 297 | { |
4be44fcd | 298 | int result = 0; |
1da177e4 LT |
299 | |
300 | ACPI_FUNCTION_TRACE("acpi_ac_init"); | |
301 | ||
302 | acpi_ac_dir = proc_mkdir(ACPI_AC_CLASS, acpi_root_dir); | |
303 | if (!acpi_ac_dir) | |
304 | return_VALUE(-ENODEV); | |
305 | acpi_ac_dir->owner = THIS_MODULE; | |
306 | ||
307 | result = acpi_bus_register_driver(&acpi_ac_driver); | |
308 | if (result < 0) { | |
309 | remove_proc_entry(ACPI_AC_CLASS, acpi_root_dir); | |
310 | return_VALUE(-ENODEV); | |
311 | } | |
312 | ||
313 | return_VALUE(0); | |
314 | } | |
315 | ||
4be44fcd | 316 | static void __exit acpi_ac_exit(void) |
1da177e4 LT |
317 | { |
318 | ACPI_FUNCTION_TRACE("acpi_ac_exit"); | |
319 | ||
320 | acpi_bus_unregister_driver(&acpi_ac_driver); | |
321 | ||
322 | remove_proc_entry(ACPI_AC_CLASS, acpi_root_dir); | |
323 | ||
324 | return_VOID; | |
325 | } | |
326 | ||
1da177e4 LT |
327 | module_init(acpi_ac_init); |
328 | module_exit(acpi_ac_exit); |