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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_COMPONENT 0x00020000
41#define ACPI_AC_CLASS "ac_adapter"
42#define ACPI_AC_DEVICE_NAME "AC Adapter"
43#define ACPI_AC_FILE_STATE "state"
44#define ACPI_AC_NOTIFY_STATUS 0x80
45#define ACPI_AC_STATUS_OFFLINE 0x00
46#define ACPI_AC_STATUS_ONLINE 0x01
47#define ACPI_AC_STATUS_UNKNOWN 0xFF
48
49#define _COMPONENT ACPI_AC_COMPONENT
50ACPI_MODULE_NAME("ac");
51
52MODULE_AUTHOR("Paul Diefenbaugh");
53MODULE_DESCRIPTION("ACPI AC Adapter Driver");
54MODULE_LICENSE("GPL");
55
56#ifdef CONFIG_ACPI_PROCFS_POWER
57extern struct proc_dir_entry *acpi_lock_ac_dir(void);
58extern void *acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir);
59static int acpi_ac_open_fs(struct inode *inode, struct file *file);
60#endif
61
62static int acpi_ac_add(struct acpi_device *device);
63static int acpi_ac_remove(struct acpi_device *device, int type);
64static int acpi_ac_resume(struct acpi_device *device);
65
66const static struct acpi_device_id ac_device_ids[] = {
67 {"ACPI0003", 0},
68 {"", 0},
69};
70MODULE_DEVICE_TABLE(acpi, ac_device_ids);
71
72static struct acpi_driver acpi_ac_driver = {
73 .name = "ac",
74 .class = ACPI_AC_CLASS,
75 .ids = ac_device_ids,
76 .ops = {
77 .add = acpi_ac_add,
78 .remove = acpi_ac_remove,
79 .resume = acpi_ac_resume,
80 },
81};
82
83struct acpi_ac {
84#ifdef CONFIG_ACPI_SYSFS_POWER
85 struct power_supply charger;
86#endif
87 struct acpi_device * device;
88 unsigned long state;
89};
90
91#define to_acpi_ac(x) container_of(x, struct acpi_ac, charger);
92
93#ifdef CONFIG_ACPI_PROCFS_POWER
94static const struct file_operations acpi_ac_fops = {
95 .open = acpi_ac_open_fs,
96 .read = seq_read,
97 .llseek = seq_lseek,
98 .release = single_release,
99};
100#endif
101#ifdef CONFIG_ACPI_SYSFS_POWER
102static int get_ac_property(struct power_supply *psy,
103 enum power_supply_property psp,
104 union power_supply_propval *val)
105{
106 struct acpi_ac *ac = to_acpi_ac(psy);
107 switch (psp) {
108 case POWER_SUPPLY_PROP_ONLINE:
109 val->intval = ac->state;
110 break;
111 default:
112 return -EINVAL;
113 }
114 return 0;
115}
116
117static enum power_supply_property ac_props[] = {
118 POWER_SUPPLY_PROP_ONLINE,
119};
120#endif
121
122
123
124
125static int acpi_ac_get_state(struct acpi_ac *ac)
126{
127 acpi_status status = AE_OK;
128
129
130 if (!ac)
131 return -EINVAL;
132
133 status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL, &ac->state);
134 if (ACPI_FAILURE(status)) {
135 ACPI_EXCEPTION((AE_INFO, status, "Error reading AC Adapter state"));
136 ac->state = ACPI_AC_STATUS_UNKNOWN;
137 return -ENODEV;
138 }
139
140 return 0;
141}
142
143#ifdef CONFIG_ACPI_PROCFS_POWER
144
145
146
147
148static struct proc_dir_entry *acpi_ac_dir;
149
150static int acpi_ac_seq_show(struct seq_file *seq, void *offset)
151{
152 struct acpi_ac *ac = seq->private;
153
154
155 if (!ac)
156 return 0;
157
158 if (acpi_ac_get_state(ac)) {
159 seq_puts(seq, "ERROR: Unable to read AC Adapter state\n");
160 return 0;
161 }
162
163 seq_puts(seq, "state: ");
164 switch (ac->state) {
165 case ACPI_AC_STATUS_OFFLINE:
166 seq_puts(seq, "off-line\n");
167 break;
168 case ACPI_AC_STATUS_ONLINE:
169 seq_puts(seq, "on-line\n");
170 break;
171 default:
172 seq_puts(seq, "unknown\n");
173 break;
174 }
175
176 return 0;
177}
178
179static int acpi_ac_open_fs(struct inode *inode, struct file *file)
180{
181 return single_open(file, acpi_ac_seq_show, PDE(inode)->data);
182}
183
184static int acpi_ac_add_fs(struct acpi_device *device)
185{
186 struct proc_dir_entry *entry = NULL;
187
188
189 if (!acpi_device_dir(device)) {
190 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
191 acpi_ac_dir);
192 if (!acpi_device_dir(device))
193 return -ENODEV;
194 acpi_device_dir(device)->owner = THIS_MODULE;
195 }
196
197
198 entry = create_proc_entry(ACPI_AC_FILE_STATE,
199 S_IRUGO, acpi_device_dir(device));
200 if (!entry)
201 return -ENODEV;
202 else {
203 entry->proc_fops = &acpi_ac_fops;
204 entry->data = acpi_driver_data(device);
205 entry->owner = THIS_MODULE;
206 }
207
208 return 0;
209}
210
211static int acpi_ac_remove_fs(struct acpi_device *device)
212{
213
214 if (acpi_device_dir(device)) {
215 remove_proc_entry(ACPI_AC_FILE_STATE, acpi_device_dir(device));
216
217 remove_proc_entry(acpi_device_bid(device), acpi_ac_dir);
218 acpi_device_dir(device) = NULL;
219 }
220
221 return 0;
222}
223#endif
224
225
226
227
228
229static void acpi_ac_notify(acpi_handle handle, u32 event, void *data)
230{
231 struct acpi_ac *ac = data;
232 struct acpi_device *device = NULL;
233
234
235 if (!ac)
236 return;
237
238 device = ac->device;
239 switch (event) {
240 case ACPI_AC_NOTIFY_STATUS:
241 case ACPI_NOTIFY_BUS_CHECK:
242 case ACPI_NOTIFY_DEVICE_CHECK:
243 acpi_ac_get_state(ac);
244 acpi_bus_generate_proc_event(device, event, (u32) ac->state);
245 acpi_bus_generate_netlink_event(device->pnp.device_class,
246 device->dev.bus_id, event,
247 (u32) ac->state);
248#ifdef CONFIG_ACPI_SYSFS_POWER
249 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
250#endif
251 break;
252 default:
253 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
254 "Unsupported event [0x%x]\n", event));
255 break;
256 }
257
258 return;
259}
260
261static int acpi_ac_add(struct acpi_device *device)
262{
263 int result = 0;
264 acpi_status status = AE_OK;
265 struct acpi_ac *ac = NULL;
266
267
268 if (!device)
269 return -EINVAL;
270
271 ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL);
272 if (!ac)
273 return -ENOMEM;
274
275 ac->device = device;
276 strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME);
277 strcpy(acpi_device_class(device), ACPI_AC_CLASS);
278 acpi_driver_data(device) = ac;
279
280 result = acpi_ac_get_state(ac);
281 if (result)
282 goto end;
283
284#ifdef CONFIG_ACPI_PROCFS_POWER
285 result = acpi_ac_add_fs(device);
286#endif
287 if (result)
288 goto end;
289#ifdef CONFIG_ACPI_SYSFS_POWER
290 ac->charger.name = acpi_device_bid(device);
291 ac->charger.type = POWER_SUPPLY_TYPE_MAINS;
292 ac->charger.properties = ac_props;
293 ac->charger.num_properties = ARRAY_SIZE(ac_props);
294 ac->charger.get_property = get_ac_property;
295 power_supply_register(&ac->device->dev, &ac->charger);
296#endif
297 status = acpi_install_notify_handler(device->handle,
298 ACPI_ALL_NOTIFY, acpi_ac_notify,
299 ac);
300 if (ACPI_FAILURE(status)) {
301 result = -ENODEV;
302 goto end;
303 }
304
305 printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
306 acpi_device_name(device), acpi_device_bid(device),
307 ac->state ? "on-line" : "off-line");
308
309 end:
310 if (result) {
311#ifdef CONFIG_ACPI_PROCFS_POWER
312 acpi_ac_remove_fs(device);
313#endif
314 kfree(ac);
315 }
316
317 return result;
318}
319
320static int acpi_ac_resume(struct acpi_device *device)
321{
322 struct acpi_ac *ac;
323 unsigned old_state;
324 if (!device || !acpi_driver_data(device))
325 return -EINVAL;
326 ac = acpi_driver_data(device);
327 old_state = ac->state;
328 if (acpi_ac_get_state(ac))
329 return 0;
330#ifdef CONFIG_ACPI_SYSFS_POWER
331 if (old_state != ac->state)
332 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
333#endif
334 return 0;
335}
336
337static int acpi_ac_remove(struct acpi_device *device, int type)
338{
339 acpi_status status = AE_OK;
340 struct acpi_ac *ac = NULL;
341
342
343 if (!device || !acpi_driver_data(device))
344 return -EINVAL;
345
346 ac = acpi_driver_data(device);
347
348 status = acpi_remove_notify_handler(device->handle,
349 ACPI_ALL_NOTIFY, acpi_ac_notify);
350#ifdef CONFIG_ACPI_SYSFS_POWER
351 if (ac->charger.dev)
352 power_supply_unregister(&ac->charger);
353#endif
354#ifdef CONFIG_ACPI_PROCFS_POWER
355 acpi_ac_remove_fs(device);
356#endif
357
358 kfree(ac);
359
360 return 0;
361}
362
363static int __init acpi_ac_init(void)
364{
365 int result;
366
367 if (acpi_disabled)
368 return -ENODEV;
369
370#ifdef CONFIG_ACPI_PROCFS_POWER
371 acpi_ac_dir = acpi_lock_ac_dir();
372 if (!acpi_ac_dir)
373 return -ENODEV;
374#endif
375
376 result = acpi_bus_register_driver(&acpi_ac_driver);
377 if (result < 0) {
378#ifdef CONFIG_ACPI_PROCFS_POWER
379 acpi_unlock_ac_dir(acpi_ac_dir);
380#endif
381 return -ENODEV;
382 }
383
384 return 0;
385}
386
387static void __exit acpi_ac_exit(void)
388{
389
390 acpi_bus_unregister_driver(&acpi_ac_driver);
391
392#ifdef CONFIG_ACPI_PROCFS_POWER
393 acpi_unlock_ac_dir(acpi_ac_dir);
394#endif
395
396 return;
397}
398
399module_init(acpi_ac_init);
400module_exit(acpi_ac_exit);
401
