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
35
36 #define ACPI_AC_COMPONENT 0x00020000
37 #define ACPI_AC_CLASS "ac_adapter"
38 #define ACPI_AC_HID "ACPI0003"
39 #define ACPI_AC_DRIVER_NAME "ACPI AC Adapter Driver"
40 #define ACPI_AC_DEVICE_NAME "AC Adapter"
41 #define ACPI_AC_FILE_STATE "state"
42 #define ACPI_AC_NOTIFY_STATUS 0x80
43 #define ACPI_AC_STATUS_OFFLINE 0x00
44 #define ACPI_AC_STATUS_ONLINE 0x01
45 #define ACPI_AC_STATUS_UNKNOWN 0xFF
46
47 #define _COMPONENT ACPI_AC_COMPONENT
48 ACPI_MODULE_NAME ("acpi_ac")
49
50 MODULE_AUTHOR("Paul Diefenbaugh");
51 MODULE_DESCRIPTION(ACPI_AC_DRIVER_NAME);
52 MODULE_LICENSE("GPL");
53
54 int acpi_ac_add (struct acpi_device *device);
55 int acpi_ac_remove (struct acpi_device *device, int type);
56 static int acpi_ac_open_fs(struct inode *inode, struct file *file);
57
58 static struct acpi_driver acpi_ac_driver = {
59 .name = ACPI_AC_DRIVER_NAME,
60 .class = ACPI_AC_CLASS,
61 .ids = ACPI_AC_HID,
62 .ops = {
63 .add = acpi_ac_add,
64 .remove = acpi_ac_remove,
65 },
66 };
67
68 struct acpi_ac {
69 acpi_handle handle;
70 unsigned long state;
71 };
72
73 static struct file_operations acpi_ac_fops = {
74 .open = acpi_ac_open_fs,
75 .read = seq_read,
76 .llseek = seq_lseek,
77 .release = single_release,
78 };
79
80 /* --------------------------------------------------------------------------
81 AC Adapter Management
82 -------------------------------------------------------------------------- */
83
84 static int
85 acpi_ac_get_state (
86 struct acpi_ac *ac)
87 {
88 acpi_status status = AE_OK;
89
90 ACPI_FUNCTION_TRACE("acpi_ac_get_state");
91
92 if (!ac)
93 return_VALUE(-EINVAL);
94
95 status = acpi_evaluate_integer(ac->handle, "_PSR", NULL, &ac->state);
96 if (ACPI_FAILURE(status)) {
97 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
98 "Error reading AC Adapter state\n"));
99 ac->state = ACPI_AC_STATUS_UNKNOWN;
100 return_VALUE(-ENODEV);
101 }
102
103 return_VALUE(0);
104 }
105
106
107 /* --------------------------------------------------------------------------
108 FS Interface (/proc)
109 -------------------------------------------------------------------------- */
110
111 struct proc_dir_entry *acpi_ac_dir;
112
113 int acpi_ac_seq_show(struct seq_file *seq, void *offset)
114 {
115 struct acpi_ac *ac = (struct acpi_ac *) seq->private;
116
117 ACPI_FUNCTION_TRACE("acpi_ac_seq_show");
118
119 if (!ac)
120 return_VALUE(0);
121
122 if (acpi_ac_get_state(ac)) {
123 seq_puts(seq, "ERROR: Unable to read AC Adapter state\n");
124 return_VALUE(0);
125 }
126
127 seq_puts(seq, "state: ");
128 switch (ac->state) {
129 case ACPI_AC_STATUS_OFFLINE:
130 seq_puts(seq, "off-line\n");
131 break;
132 case ACPI_AC_STATUS_ONLINE:
133 seq_puts(seq, "on-line\n");
134 break;
135 default:
136 seq_puts(seq, "unknown\n");
137 break;
138 }
139
140 return_VALUE(0);
141 }
142
143 static int acpi_ac_open_fs(struct inode *inode, struct file *file)
144 {
145 return single_open(file, acpi_ac_seq_show, PDE(inode)->data);
146 }
147
148 static int
149 acpi_ac_add_fs (
150 struct acpi_device *device)
151 {
152 struct proc_dir_entry *entry = NULL;
153
154 ACPI_FUNCTION_TRACE("acpi_ac_add_fs");
155
156 if (!acpi_device_dir(device)) {
157 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
158 acpi_ac_dir);
159 if (!acpi_device_dir(device))
160 return_VALUE(-ENODEV);
161 acpi_device_dir(device)->owner = THIS_MODULE;
162 }
163
164 /* 'state' [R] */
165 entry = create_proc_entry(ACPI_AC_FILE_STATE,
166 S_IRUGO, acpi_device_dir(device));
167 if (!entry)
168 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
169 "Unable to create '%s' fs entry\n",
170 ACPI_AC_FILE_STATE));
171 else {
172 entry->proc_fops = &acpi_ac_fops;
173 entry->data = acpi_driver_data(device);
174 entry->owner = THIS_MODULE;
175 }
176
177 return_VALUE(0);
178 }
179
180
181 static int
182 acpi_ac_remove_fs (
183 struct acpi_device *device)
184 {
185 ACPI_FUNCTION_TRACE("acpi_ac_remove_fs");
186
187 if (acpi_device_dir(device)) {
188 remove_proc_entry(ACPI_AC_FILE_STATE,
189 acpi_device_dir(device));
190
191 remove_proc_entry(acpi_device_bid(device), acpi_ac_dir);
192 acpi_device_dir(device) = NULL;
193 }
194
195 return_VALUE(0);
196 }
197
198
199 /* --------------------------------------------------------------------------
200 Driver Model
201 -------------------------------------------------------------------------- */
202
203 void
204 acpi_ac_notify (
205 acpi_handle handle,
206 u32 event,
207 void *data)
208 {
209 struct acpi_ac *ac = (struct acpi_ac *) data;
210 struct acpi_device *device = NULL;
211
212 ACPI_FUNCTION_TRACE("acpi_ac_notify");
213
214 if (!ac)
215 return_VOID;
216
217 if (acpi_bus_get_device(ac->handle, &device))
218 return_VOID;
219
220 switch (event) {
221 case ACPI_AC_NOTIFY_STATUS:
222 acpi_ac_get_state(ac);
223 acpi_bus_generate_event(device, event, (u32) ac->state);
224 break;
225 default:
226 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
227 "Unsupported event [0x%x]\n", event));
228 break;
229 }
230
231 return_VOID;
232 }
233
234
235 int
236 acpi_ac_add (
237 struct acpi_device *device)
238 {
239 int result = 0;
240 acpi_status status = AE_OK;
241 struct acpi_ac *ac = NULL;
242
243 ACPI_FUNCTION_TRACE("acpi_ac_add");
244
245 if (!device)
246 return_VALUE(-EINVAL);
247
248 ac = kmalloc(sizeof(struct acpi_ac), GFP_KERNEL);
249 if (!ac)
250 return_VALUE(-ENOMEM);
251 memset(ac, 0, sizeof(struct acpi_ac));
252
253 ac->handle = device->handle;
254 strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME);
255 strcpy(acpi_device_class(device), ACPI_AC_CLASS);
256 acpi_driver_data(device) = ac;
257
258 result = acpi_ac_get_state(ac);
259 if (result)
260 goto end;
261
262 result = acpi_ac_add_fs(device);
263 if (result)
264 goto end;
265
266 status = acpi_install_notify_handler(ac->handle,
267 ACPI_DEVICE_NOTIFY, acpi_ac_notify, ac);
268 if (ACPI_FAILURE(status)) {
269 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
270 "Error installing notify handler\n"));
271 result = -ENODEV;
272 goto end;
273 }
274
275 printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
276 acpi_device_name(device), acpi_device_bid(device),
277 ac->state?"on-line":"off-line");
278
279 end:
280 if (result) {
281 acpi_ac_remove_fs(device);
282 kfree(ac);
283 }
284
285 return_VALUE(result);
286 }
287
288
289 int
290 acpi_ac_remove (
291 struct acpi_device *device,
292 int type)
293 {
294 acpi_status status = AE_OK;
295 struct acpi_ac *ac = NULL;
296
297 ACPI_FUNCTION_TRACE("acpi_ac_remove");
298
299 if (!device || !acpi_driver_data(device))
300 return_VALUE(-EINVAL);
301
302 ac = (struct acpi_ac *) acpi_driver_data(device);
303
304 status = acpi_remove_notify_handler(ac->handle,
305 ACPI_DEVICE_NOTIFY, acpi_ac_notify);
306 if (ACPI_FAILURE(status))
307 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
308 "Error removing notify handler\n"));
309
310 acpi_ac_remove_fs(device);
311
312 kfree(ac);
313
314 return_VALUE(0);
315 }
316
317
318 int __init
319 acpi_ac_init (void)
320 {
321 int result = 0;
322
323 ACPI_FUNCTION_TRACE("acpi_ac_init");
324
325 acpi_ac_dir = proc_mkdir(ACPI_AC_CLASS, acpi_root_dir);
326 if (!acpi_ac_dir)
327 return_VALUE(-ENODEV);
328 acpi_ac_dir->owner = THIS_MODULE;
329
330 result = acpi_bus_register_driver(&acpi_ac_driver);
331 if (result < 0) {
332 remove_proc_entry(ACPI_AC_CLASS, acpi_root_dir);
333 return_VALUE(-ENODEV);
334 }
335
336 return_VALUE(0);
337 }
338
339
340 void __exit
341 acpi_ac_exit (void)
342 {
343 ACPI_FUNCTION_TRACE("acpi_ac_exit");
344
345 acpi_bus_unregister_driver(&acpi_ac_driver);
346
347 remove_proc_entry(ACPI_AC_CLASS, acpi_root_dir);
348
349 return_VOID;
350 }
351
352
353 module_init(acpi_ac_init);
354 module_exit(acpi_ac_exit);
355
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