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 #ifdef CONFIG_ACPI_PROCFS_POWER
31 #include <linux/proc_fs.h>
32 #include <linux/seq_file.h>
33 #endif
34 #ifdef CONFIG_ACPI_SYSFS_POWER
35 #include <linux/power_supply.h>
36 #endif
37 #include <acpi/acpi_bus.h>
38 #include <acpi/acpi_drivers.h>
39
40 #define ACPI_AC_CLASS "ac_adapter"
41 #define ACPI_AC_DEVICE_NAME "AC Adapter"
42 #define ACPI_AC_FILE_STATE "state"
43 #define ACPI_AC_NOTIFY_STATUS 0x80
44 #define ACPI_AC_STATUS_OFFLINE 0x00
45 #define ACPI_AC_STATUS_ONLINE 0x01
46 #define ACPI_AC_STATUS_UNKNOWN 0xFF
47
48 #define _COMPONENT ACPI_AC_COMPONENT
49 ACPI_MODULE_NAME("ac");
50
51 MODULE_AUTHOR("Paul Diefenbaugh");
52 MODULE_DESCRIPTION("ACPI AC Adapter Driver");
53 MODULE_LICENSE("GPL");
54
55 #ifdef CONFIG_ACPI_PROCFS_POWER
56 extern struct proc_dir_entry *acpi_lock_ac_dir(void);
57 extern void *acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir);
58 static int acpi_ac_open_fs(struct inode *inode, struct file *file);
59 #endif
60
61 static int acpi_ac_add(struct acpi_device *device);
62 static int acpi_ac_remove(struct acpi_device *device, int type);
63 static int acpi_ac_resume(struct acpi_device *device);
64 static void acpi_ac_notify(struct acpi_device *device, u32 event);
65
66 static const struct acpi_device_id ac_device_ids[] = {
67 {"ACPI0003", 0},
68 {"", 0},
69 };
70 MODULE_DEVICE_TABLE(acpi, ac_device_ids);
71
72 static struct acpi_driver acpi_ac_driver = {
73 .name = "ac",
74 .class = ACPI_AC_CLASS,
75 .ids = ac_device_ids,
76 .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
77 .ops = {
78 .add = acpi_ac_add,
79 .remove = acpi_ac_remove,
80 .resume = acpi_ac_resume,
81 .notify = acpi_ac_notify,
82 },
83 };
84
85 struct acpi_ac {
86 #ifdef CONFIG_ACPI_SYSFS_POWER
87 struct power_supply charger;
88 #endif
89 struct acpi_device * device;
90 unsigned long long state;
91 };
92
93 #define to_acpi_ac(x) container_of(x, struct acpi_ac, charger);
94
95 #ifdef CONFIG_ACPI_PROCFS_POWER
96 static const struct file_operations acpi_ac_fops = {
97 .owner = THIS_MODULE,
98 .open = acpi_ac_open_fs,
99 .read = seq_read,
100 .llseek = seq_lseek,
101 .release = single_release,
102 };
103 #endif
104 #ifdef CONFIG_ACPI_SYSFS_POWER
105 static int get_ac_property(struct power_supply *psy,
106 enum power_supply_property psp,
107 union power_supply_propval *val)
108 {
109 struct acpi_ac *ac = to_acpi_ac(psy);
110 switch (psp) {
111 case POWER_SUPPLY_PROP_ONLINE:
112 val->intval = ac->state;
113 break;
114 default:
115 return -EINVAL;
116 }
117 return 0;
118 }
119
120 static enum power_supply_property ac_props[] = {
121 POWER_SUPPLY_PROP_ONLINE,
122 };
123 #endif
124 /* --------------------------------------------------------------------------
125 AC Adapter Management
126 -------------------------------------------------------------------------- */
127
128 static int acpi_ac_get_state(struct acpi_ac *ac)
129 {
130 acpi_status status = AE_OK;
131
132
133 if (!ac)
134 return -EINVAL;
135
136 status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL, &ac->state);
137 if (ACPI_FAILURE(status)) {
138 ACPI_EXCEPTION((AE_INFO, status, "Error reading AC Adapter state"));
139 ac->state = ACPI_AC_STATUS_UNKNOWN;
140 return -ENODEV;
141 }
142
143 return 0;
144 }
145
146 #ifdef CONFIG_ACPI_PROCFS_POWER
147 /* --------------------------------------------------------------------------
148 FS Interface (/proc)
149 -------------------------------------------------------------------------- */
150
151 static struct proc_dir_entry *acpi_ac_dir;
152
153 static int acpi_ac_seq_show(struct seq_file *seq, void *offset)
154 {
155 struct acpi_ac *ac = seq->private;
156
157
158 if (!ac)
159 return 0;
160
161 if (acpi_ac_get_state(ac)) {
162 seq_puts(seq, "ERROR: Unable to read AC Adapter state\n");
163 return 0;
164 }
165
166 seq_puts(seq, "state: ");
167 switch (ac->state) {
168 case ACPI_AC_STATUS_OFFLINE:
169 seq_puts(seq, "off-line\n");
170 break;
171 case ACPI_AC_STATUS_ONLINE:
172 seq_puts(seq, "on-line\n");
173 break;
174 default:
175 seq_puts(seq, "unknown\n");
176 break;
177 }
178
179 return 0;
180 }
181
182 static int acpi_ac_open_fs(struct inode *inode, struct file *file)
183 {
184 return single_open(file, acpi_ac_seq_show, PDE(inode)->data);
185 }
186
187 static int acpi_ac_add_fs(struct acpi_device *device)
188 {
189 struct proc_dir_entry *entry = NULL;
190
191
192 if (!acpi_device_dir(device)) {
193 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
194 acpi_ac_dir);
195 if (!acpi_device_dir(device))
196 return -ENODEV;
197 }
198
199 /* 'state' [R] */
200 entry = proc_create_data(ACPI_AC_FILE_STATE,
201 S_IRUGO, acpi_device_dir(device),
202 &acpi_ac_fops, acpi_driver_data(device));
203 if (!entry)
204 return -ENODEV;
205 return 0;
206 }
207
208 static int acpi_ac_remove_fs(struct acpi_device *device)
209 {
210
211 if (acpi_device_dir(device)) {
212 remove_proc_entry(ACPI_AC_FILE_STATE, acpi_device_dir(device));
213
214 remove_proc_entry(acpi_device_bid(device), acpi_ac_dir);
215 acpi_device_dir(device) = NULL;
216 }
217
218 return 0;
219 }
220 #endif
221
222 /* --------------------------------------------------------------------------
223 Driver Model
224 -------------------------------------------------------------------------- */
225
226 static void acpi_ac_notify(struct acpi_device *device, u32 event)
227 {
228 struct acpi_ac *ac = acpi_driver_data(device);
229
230
231 if (!ac)
232 return;
233
234 switch (event) {
235 default:
236 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
237 "Unsupported event [0x%x]\n", event));
238 case ACPI_AC_NOTIFY_STATUS:
239 case ACPI_NOTIFY_BUS_CHECK:
240 case ACPI_NOTIFY_DEVICE_CHECK:
241 acpi_ac_get_state(ac);
242 acpi_bus_generate_proc_event(device, event, (u32) ac->state);
243 acpi_bus_generate_netlink_event(device->pnp.device_class,
244 dev_name(&device->dev), event,
245 (u32) ac->state);
246 #ifdef CONFIG_ACPI_SYSFS_POWER
247 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
248 #endif
249 }
250
251 return;
252 }
253
254 static int acpi_ac_add(struct acpi_device *device)
255 {
256 int result = 0;
257 struct acpi_ac *ac = NULL;
258
259
260 if (!device)
261 return -EINVAL;
262
263 ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL);
264 if (!ac)
265 return -ENOMEM;
266
267 ac->device = device;
268 strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME);
269 strcpy(acpi_device_class(device), ACPI_AC_CLASS);
270 device->driver_data = ac;
271
272 result = acpi_ac_get_state(ac);
273 if (result)
274 goto end;
275
276 #ifdef CONFIG_ACPI_PROCFS_POWER
277 result = acpi_ac_add_fs(device);
278 #endif
279 if (result)
280 goto end;
281 #ifdef CONFIG_ACPI_SYSFS_POWER
282 ac->charger.name = acpi_device_bid(device);
283 ac->charger.type = POWER_SUPPLY_TYPE_MAINS;
284 ac->charger.properties = ac_props;
285 ac->charger.num_properties = ARRAY_SIZE(ac_props);
286 ac->charger.get_property = get_ac_property;
287 power_supply_register(&ac->device->dev, &ac->charger);
288 #endif
289
290 printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
291 acpi_device_name(device), acpi_device_bid(device),
292 ac->state ? "on-line" : "off-line");
293
294 end:
295 if (result) {
296 #ifdef CONFIG_ACPI_PROCFS_POWER
297 acpi_ac_remove_fs(device);
298 #endif
299 kfree(ac);
300 }
301
302 return result;
303 }
304
305 static int acpi_ac_resume(struct acpi_device *device)
306 {
307 struct acpi_ac *ac;
308 unsigned old_state;
309 if (!device || !acpi_driver_data(device))
310 return -EINVAL;
311 ac = acpi_driver_data(device);
312 old_state = ac->state;
313 if (acpi_ac_get_state(ac))
314 return 0;
315 #ifdef CONFIG_ACPI_SYSFS_POWER
316 if (old_state != ac->state)
317 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
318 #endif
319 return 0;
320 }
321
322 static int acpi_ac_remove(struct acpi_device *device, int type)
323 {
324 struct acpi_ac *ac = NULL;
325
326
327 if (!device || !acpi_driver_data(device))
328 return -EINVAL;
329
330 ac = acpi_driver_data(device);
331
332 #ifdef CONFIG_ACPI_SYSFS_POWER
333 if (ac->charger.dev)
334 power_supply_unregister(&ac->charger);
335 #endif
336 #ifdef CONFIG_ACPI_PROCFS_POWER
337 acpi_ac_remove_fs(device);
338 #endif
339
340 kfree(ac);
341
342 return 0;
343 }
344
345 static int __init acpi_ac_init(void)
346 {
347 int result;
348
349 if (acpi_disabled)
350 return -ENODEV;
351
352 #ifdef CONFIG_ACPI_PROCFS_POWER
353 acpi_ac_dir = acpi_lock_ac_dir();
354 if (!acpi_ac_dir)
355 return -ENODEV;
356 #endif
357
358 result = acpi_bus_register_driver(&acpi_ac_driver);
359 if (result < 0) {
360 #ifdef CONFIG_ACPI_PROCFS_POWER
361 acpi_unlock_ac_dir(acpi_ac_dir);
362 #endif
363 return -ENODEV;
364 }
365
366 return 0;
367 }
368
369 static void __exit acpi_ac_exit(void)
370 {
371
372 acpi_bus_unregister_driver(&acpi_ac_driver);
373
374 #ifdef CONFIG_ACPI_PROCFS_POWER
375 acpi_unlock_ac_dir(acpi_ac_dir);
376 #endif
377
378 return;
379 }
380
381 module_init(acpi_ac_init);
382 module_exit(acpi_ac_exit);
383
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