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