1 /*
2 * acpi_ac.c - ACPI AC Adapter Driver ($Revision: 26 $)
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/compatmac.h>
31 #include <linux/proc_fs.h>
32 #include <acpi/acpi_bus.h>
33 #include <acpi/acpi_drivers.h>
34
35
36 #define _COMPONENT ACPI_AC_COMPONENT
37 ACPI_MODULE_NAME ("acpi_ac")
38
39 MODULE_AUTHOR("Paul Diefenbaugh");
40 MODULE_DESCRIPTION(ACPI_AC_DRIVER_NAME);
41 MODULE_LICENSE("GPL");
42
43 #define PREFIX "ACPI: "
44
45
46 int acpi_ac_add (struct acpi_device *device);
47 int acpi_ac_remove (struct acpi_device *device, int type);
48
49 static struct acpi_driver acpi_ac_driver = {
50 .name = ACPI_AC_DRIVER_NAME,
51 .class = ACPI_AC_CLASS,
52 .ids = ACPI_AC_HID,
53 .ops = {
54 .add = acpi_ac_add,
55 .remove = acpi_ac_remove,
56 },
57 };
58
59 struct acpi_ac {
60 acpi_handle handle;
61 unsigned long state;
62 };
63
64
65 /* --------------------------------------------------------------------------
66 AC Adapter Management
67 -------------------------------------------------------------------------- */
68
69 static int
acpi_ac_get_state(struct acpi_ac * ac)70 acpi_ac_get_state (
71 struct acpi_ac *ac)
72 {
73 acpi_status status = AE_OK;
74
75 ACPI_FUNCTION_TRACE("acpi_ac_get_state");
76
77 if (!ac)
78 return_VALUE(-EINVAL);
79
80 status = acpi_evaluate_integer(ac->handle, "_PSR", NULL, &ac->state);
81 if (ACPI_FAILURE(status)) {
82 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
83 "Error reading AC Adapter state\n"));
84 ac->state = ACPI_AC_STATUS_UNKNOWN;
85 return_VALUE(-ENODEV);
86 }
87
88 return_VALUE(0);
89 }
90
91
92 /* --------------------------------------------------------------------------
93 FS Interface (/proc)
94 -------------------------------------------------------------------------- */
95
96 struct proc_dir_entry *acpi_ac_dir;
97
98 static int
acpi_ac_read_state(char * page,char ** start,off_t off,int count,int * eof,void * data)99 acpi_ac_read_state (
100 char *page,
101 char **start,
102 off_t off,
103 int count,
104 int *eof,
105 void *data)
106 {
107 struct acpi_ac *ac = (struct acpi_ac *) data;
108 char *p = page;
109 int len = 0;
110
111 ACPI_FUNCTION_TRACE("acpi_ac_read_state");
112
113 if (!ac || (off != 0))
114 goto end;
115
116 if (acpi_ac_get_state(ac)) {
117 p += sprintf(p, "ERROR: Unable to read AC Adapter state\n");
118 goto end;
119 }
120
121 p += sprintf(p, "state: ");
122 switch (ac->state) {
123 case ACPI_AC_STATUS_OFFLINE:
124 p += sprintf(p, "off-line\n");
125 break;
126 case ACPI_AC_STATUS_ONLINE:
127 p += sprintf(p, "on-line\n");
128 break;
129 default:
130 p += sprintf(p, "unknown\n");
131 break;
132 }
133
134 end:
135 len = (p - page);
136 if (len <= off+count) *eof = 1;
137 *start = page + off;
138 len -= off;
139 if (len>count) len = count;
140 if (len<0) len = 0;
141
142 return_VALUE(len);
143 }
144
145
146 static int
acpi_ac_add_fs(struct acpi_device * device)147 acpi_ac_add_fs (
148 struct acpi_device *device)
149 {
150 struct proc_dir_entry *entry = NULL;
151
152 ACPI_FUNCTION_TRACE("acpi_ac_add_fs");
153
154 if (!acpi_device_dir(device)) {
155 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
156 acpi_ac_dir);
157 if (!acpi_device_dir(device))
158 return_VALUE(-ENODEV);
159 acpi_device_dir(device)->owner = THIS_MODULE;
160 }
161
162 /* 'state' [R] */
163 entry = create_proc_entry(ACPI_AC_FILE_STATE,
164 S_IRUGO, acpi_device_dir(device));
165 if (!entry)
166 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
167 "Unable to create '%s' fs entry\n",
168 ACPI_AC_FILE_STATE));
169 else {
170 entry->read_proc = acpi_ac_read_state;
171 entry->data = acpi_driver_data(device);
172 entry->owner = THIS_MODULE;
173 }
174
175 return_VALUE(0);
176 }
177
178
179 static int
acpi_ac_remove_fs(struct acpi_device * device)180 acpi_ac_remove_fs (
181 struct acpi_device *device)
182 {
183 ACPI_FUNCTION_TRACE("acpi_ac_remove_fs");
184
185 if (acpi_device_dir(device)) {
186 remove_proc_entry(ACPI_AC_FILE_STATE,
187 acpi_device_dir(device));
188 remove_proc_entry(acpi_device_bid(device), acpi_ac_dir);
189 acpi_device_dir(device) = NULL;
190 }
191
192 return_VALUE(0);
193 }
194
195
196 /* --------------------------------------------------------------------------
197 Driver Model
198 -------------------------------------------------------------------------- */
199
200 void
acpi_ac_notify(acpi_handle handle,u32 event,void * data)201 acpi_ac_notify (
202 acpi_handle handle,
203 u32 event,
204 void *data)
205 {
206 struct acpi_ac *ac = (struct acpi_ac *) data;
207 struct acpi_device *device = NULL;
208
209 ACPI_FUNCTION_TRACE("acpi_ac_notify");
210
211 if (!ac)
212 return;
213
214 if (acpi_bus_get_device(ac->handle, &device))
215 return_VOID;
216
217 switch (event) {
218 case ACPI_AC_NOTIFY_STATUS:
219 acpi_ac_get_state(ac);
220 acpi_bus_generate_event(device, event, (u32) ac->state);
221 break;
222 default:
223 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
224 "Unsupported event [0x%x]\n", event));
225 break;
226 }
227
228 return_VOID;
229 }
230
231
232 int
acpi_ac_add(struct acpi_device * device)233 acpi_ac_add (
234 struct acpi_device *device)
235 {
236 int result = 0;
237 acpi_status status = AE_OK;
238 struct acpi_ac *ac = NULL;
239
240 ACPI_FUNCTION_TRACE("acpi_ac_add");
241
242 if (!device)
243 return_VALUE(-EINVAL);
244
245 ac = kmalloc(sizeof(struct acpi_ac), GFP_KERNEL);
246 if (!ac)
247 return_VALUE(-ENOMEM);
248 memset(ac, 0, sizeof(struct acpi_ac));
249
250 ac->handle = device->handle;
251 sprintf(acpi_device_name(device), "%s", ACPI_AC_DEVICE_NAME);
252 sprintf(acpi_device_class(device), "%s", ACPI_AC_CLASS);
253 acpi_driver_data(device) = ac;
254
255 result = acpi_ac_get_state(ac);
256 if (result)
257 goto end;
258
259 result = acpi_ac_add_fs(device);
260 if (result)
261 goto end;
262
263 status = acpi_install_notify_handler(ac->handle,
264 ACPI_DEVICE_NOTIFY, acpi_ac_notify, ac);
265 if (ACPI_FAILURE(status)) {
266 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
267 "Error installing notify handler\n"));
268 result = -ENODEV;
269 goto end;
270 }
271
272 printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
273 acpi_device_name(device), acpi_device_bid(device),
274 ac->state?"on-line":"off-line");
275
276 end:
277 if (result) {
278 acpi_ac_remove_fs(device);
279 kfree(ac);
280 }
281
282 return_VALUE(result);
283 }
284
285
286 int
acpi_ac_remove(struct acpi_device * device,int type)287 acpi_ac_remove (
288 struct acpi_device *device,
289 int type)
290 {
291 acpi_status status = AE_OK;
292 struct acpi_ac *ac = NULL;
293
294 ACPI_FUNCTION_TRACE("acpi_ac_remove");
295
296 if (!device || !acpi_driver_data(device))
297 return_VALUE(-EINVAL);
298
299 ac = (struct acpi_ac *) acpi_driver_data(device);
300
301 status = acpi_remove_notify_handler(ac->handle,
302 ACPI_DEVICE_NOTIFY, acpi_ac_notify);
303 if (ACPI_FAILURE(status))
304 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
305 "Error removing notify handler\n"));
306
307 acpi_ac_remove_fs(device);
308
309 kfree(ac);
310
311 return_VALUE(0);
312 }
313
314
315 int __init
acpi_ac_init(void)316 acpi_ac_init (void)
317 {
318 int result = 0;
319
320 ACPI_FUNCTION_TRACE("acpi_ac_init");
321
322 acpi_ac_dir = proc_mkdir(ACPI_AC_CLASS, acpi_root_dir);
323 if (!acpi_ac_dir)
324 return_VALUE(-ENODEV);
325 acpi_ac_dir->owner = THIS_MODULE;
326
327 result = acpi_bus_register_driver(&acpi_ac_driver);
328 if (result < 0) {
329 remove_proc_entry(ACPI_AC_CLASS, acpi_root_dir);
330 return_VALUE(-ENODEV);
331 }
332
333 return_VALUE(0);
334 }
335
336
337 void __exit
acpi_ac_exit(void)338 acpi_ac_exit (void)
339 {
340 ACPI_FUNCTION_TRACE("acpi_ac_exit");
341
342 acpi_bus_unregister_driver(&acpi_ac_driver);
343
344 remove_proc_entry(ACPI_AC_CLASS, acpi_root_dir);
345
346 return_VOID;
347 }
348
349
350 module_init(acpi_ac_init);
351 module_exit(acpi_ac_exit);
352