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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_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
49ACPI_MODULE_NAME("ac");
50
51MODULE_AUTHOR("Paul Diefenbaugh");
52MODULE_DESCRIPTION("ACPI AC Adapter Driver");
53MODULE_LICENSE("GPL");
54
55#ifdef CONFIG_ACPI_PROCFS_POWER
56extern struct proc_dir_entry *acpi_lock_ac_dir(void);
57extern void *acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir);
58static int acpi_ac_open_fs(struct inode *inode, struct file *file);
59#endif
60
61static int acpi_ac_add(struct acpi_device *device);
62static int acpi_ac_remove(struct acpi_device *device, int type);
63static int acpi_ac_resume(struct acpi_device *device);
64
65static const struct acpi_device_id ac_device_ids[] = {
66 {"ACPI0003", 0},
67 {"", 0},
68};
69MODULE_DEVICE_TABLE(acpi, ac_device_ids);
70
71static struct acpi_driver acpi_ac_driver = {
72 .name = "ac",
73 .class = ACPI_AC_CLASS,
74 .ids = ac_device_ids,
75 .ops = {
76 .add = acpi_ac_add,
77 .remove = acpi_ac_remove,
78 .resume = acpi_ac_resume,
79 },
80};
81
82struct acpi_ac {
83#ifdef CONFIG_ACPI_SYSFS_POWER
84 struct power_supply charger;
85#endif
86 struct acpi_device * device;
87 unsigned long long state;
88};
89
90#define to_acpi_ac(x) container_of(x, struct acpi_ac, charger);
91
92#ifdef CONFIG_ACPI_PROCFS_POWER
93static const struct file_operations acpi_ac_fops = {
94 .owner = THIS_MODULE,
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 }
195
196
197 entry = proc_create_data(ACPI_AC_FILE_STATE,
198 S_IRUGO, acpi_device_dir(device),
199 &acpi_ac_fops, acpi_driver_data(device));
200 if (!entry)
201 return -ENODEV;
202 return 0;
203}
204
205static int acpi_ac_remove_fs(struct acpi_device *device)
206{
207
208 if (acpi_device_dir(device)) {
209 remove_proc_entry(ACPI_AC_FILE_STATE, acpi_device_dir(device));
210
211 remove_proc_entry(acpi_device_bid(device), acpi_ac_dir);
212 acpi_device_dir(device) = NULL;
213 }
214
215 return 0;
216}
217#endif
218
219
220
221
222
223static void acpi_ac_notify(acpi_handle handle, u32 event, void *data)
224{
225 struct acpi_ac *ac = data;
226 struct acpi_device *device = NULL;
227
228
229 if (!ac)
230 return;
231
232 device = ac->device;
233 switch (event) {
234 default:
235 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
236 "Unsupported event [0x%x]\n", event));
237 case ACPI_AC_NOTIFY_STATUS:
238 case ACPI_NOTIFY_BUS_CHECK:
239 case ACPI_NOTIFY_DEVICE_CHECK:
240 acpi_ac_get_state(ac);
241 acpi_bus_generate_proc_event(device, event, (u32) ac->state);
242 acpi_bus_generate_netlink_event(device->pnp.device_class,
243 dev_name(&device->dev), event,
244 (u32) ac->state);
245#ifdef CONFIG_ACPI_SYSFS_POWER
246 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
247#endif
248 }
249
250 return;
251}
252
253static int acpi_ac_add(struct acpi_device *device)
254{
255 int result = 0;
256 acpi_status status = AE_OK;
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 status = acpi_install_notify_handler(device->handle,
290 ACPI_ALL_NOTIFY, acpi_ac_notify,
291 ac);
292 if (ACPI_FAILURE(status)) {
293 result = -ENODEV;
294 goto end;
295 }
296
297 printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
298 acpi_device_name(device), acpi_device_bid(device),
299 ac->state ? "on-line" : "off-line");
300
301 end:
302 if (result) {
303#ifdef CONFIG_ACPI_PROCFS_POWER
304 acpi_ac_remove_fs(device);
305#endif
306 kfree(ac);
307 }
308
309 return result;
310}
311
312static int acpi_ac_resume(struct acpi_device *device)
313{
314 struct acpi_ac *ac;
315 unsigned old_state;
316 if (!device || !acpi_driver_data(device))
317 return -EINVAL;
318 ac = acpi_driver_data(device);
319 old_state = ac->state;
320 if (acpi_ac_get_state(ac))
321 return 0;
322#ifdef CONFIG_ACPI_SYSFS_POWER
323 if (old_state != ac->state)
324 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
325#endif
326 return 0;
327}
328
329static int acpi_ac_remove(struct acpi_device *device, int type)
330{
331 acpi_status status = AE_OK;
332 struct acpi_ac *ac = NULL;
333
334
335 if (!device || !acpi_driver_data(device))
336 return -EINVAL;
337
338 ac = acpi_driver_data(device);
339
340 status = acpi_remove_notify_handler(device->handle,
341 ACPI_ALL_NOTIFY, acpi_ac_notify);
342#ifdef CONFIG_ACPI_SYSFS_POWER
343 if (ac->charger.dev)
344 power_supply_unregister(&ac->charger);
345#endif
346#ifdef CONFIG_ACPI_PROCFS_POWER
347 acpi_ac_remove_fs(device);
348#endif
349
350 kfree(ac);
351
352 return 0;
353}
354
355static int __init acpi_ac_init(void)
356{
357 int result;
358
359 if (acpi_disabled)
360 return -ENODEV;
361
362#ifdef CONFIG_ACPI_PROCFS_POWER
363 acpi_ac_dir = acpi_lock_ac_dir();
364 if (!acpi_ac_dir)
365 return -ENODEV;
366#endif
367
368 result = acpi_bus_register_driver(&acpi_ac_driver);
369 if (result < 0) {
370#ifdef CONFIG_ACPI_PROCFS_POWER
371 acpi_unlock_ac_dir(acpi_ac_dir);
372#endif
373 return -ENODEV;
374 }
375
376 return 0;
377}
378
379static void __exit acpi_ac_exit(void)
380{
381
382 acpi_bus_unregister_driver(&acpi_ac_driver);
383
384#ifdef CONFIG_ACPI_PROCFS_POWER
385 acpi_unlock_ac_dir(acpi_ac_dir);
386#endif
387
388 return;
389}
390
391module_init(acpi_ac_init);
392module_exit(acpi_ac_exit);
393
