Merge tag 'for-v3.8-merged' of git://git.infradead.org/battery-2.6
[~shefty/rdma-dev.git] / drivers / power / power_supply_core.c
1 /*
2  *  Universal power supply monitor class
3  *
4  *  Copyright © 2007  Anton Vorontsov <cbou@mail.ru>
5  *  Copyright © 2004  Szabolcs Gyurko
6  *  Copyright © 2003  Ian Molton <spyro@f2s.com>
7  *
8  *  Modified: 2004, Oct     Szabolcs Gyurko
9  *
10  *  You may use this code as per GPL version 2
11  */
12
13 #include <linux/module.h>
14 #include <linux/types.h>
15 #include <linux/init.h>
16 #include <linux/slab.h>
17 #include <linux/device.h>
18 #include <linux/err.h>
19 #include <linux/power_supply.h>
20 #include <linux/thermal.h>
21 #include "power_supply.h"
22
23 /* exported for the APM Power driver, APM emulation */
24 struct class *power_supply_class;
25 EXPORT_SYMBOL_GPL(power_supply_class);
26
27 static struct device_type power_supply_dev_type;
28
29 static int __power_supply_changed_work(struct device *dev, void *data)
30 {
31         struct power_supply *psy = (struct power_supply *)data;
32         struct power_supply *pst = dev_get_drvdata(dev);
33         int i;
34
35         for (i = 0; i < psy->num_supplicants; i++)
36                 if (!strcmp(psy->supplied_to[i], pst->name)) {
37                         if (pst->external_power_changed)
38                                 pst->external_power_changed(pst);
39                 }
40         return 0;
41 }
42
43 static void power_supply_changed_work(struct work_struct *work)
44 {
45         struct power_supply *psy = container_of(work, struct power_supply,
46                                                 changed_work);
47
48         dev_dbg(psy->dev, "%s\n", __func__);
49
50         class_for_each_device(power_supply_class, NULL, psy,
51                               __power_supply_changed_work);
52
53         power_supply_update_leds(psy);
54
55         kobject_uevent(&psy->dev->kobj, KOBJ_CHANGE);
56 }
57
58 void power_supply_changed(struct power_supply *psy)
59 {
60         dev_dbg(psy->dev, "%s\n", __func__);
61
62         schedule_work(&psy->changed_work);
63 }
64 EXPORT_SYMBOL_GPL(power_supply_changed);
65
66 static int __power_supply_am_i_supplied(struct device *dev, void *data)
67 {
68         union power_supply_propval ret = {0,};
69         struct power_supply *psy = (struct power_supply *)data;
70         struct power_supply *epsy = dev_get_drvdata(dev);
71         int i;
72
73         for (i = 0; i < epsy->num_supplicants; i++) {
74                 if (!strcmp(epsy->supplied_to[i], psy->name)) {
75                         if (epsy->get_property(epsy,
76                                   POWER_SUPPLY_PROP_ONLINE, &ret))
77                                 continue;
78                         if (ret.intval)
79                                 return ret.intval;
80                 }
81         }
82         return 0;
83 }
84
85 int power_supply_am_i_supplied(struct power_supply *psy)
86 {
87         int error;
88
89         error = class_for_each_device(power_supply_class, NULL, psy,
90                                       __power_supply_am_i_supplied);
91
92         dev_dbg(psy->dev, "%s %d\n", __func__, error);
93
94         return error;
95 }
96 EXPORT_SYMBOL_GPL(power_supply_am_i_supplied);
97
98 static int __power_supply_is_system_supplied(struct device *dev, void *data)
99 {
100         union power_supply_propval ret = {0,};
101         struct power_supply *psy = dev_get_drvdata(dev);
102         unsigned int *count = data;
103
104         (*count)++;
105         if (psy->type != POWER_SUPPLY_TYPE_BATTERY) {
106                 if (psy->get_property(psy, POWER_SUPPLY_PROP_ONLINE, &ret))
107                         return 0;
108                 if (ret.intval)
109                         return ret.intval;
110         }
111         return 0;
112 }
113
114 int power_supply_is_system_supplied(void)
115 {
116         int error;
117         unsigned int count = 0;
118
119         error = class_for_each_device(power_supply_class, NULL, &count,
120                                       __power_supply_is_system_supplied);
121
122         /*
123          * If no power class device was found at all, most probably we are
124          * running on a desktop system, so assume we are on mains power.
125          */
126         if (count == 0)
127                 return 1;
128
129         return error;
130 }
131 EXPORT_SYMBOL_GPL(power_supply_is_system_supplied);
132
133 int power_supply_set_battery_charged(struct power_supply *psy)
134 {
135         if (psy->type == POWER_SUPPLY_TYPE_BATTERY && psy->set_charged) {
136                 psy->set_charged(psy);
137                 return 0;
138         }
139
140         return -EINVAL;
141 }
142 EXPORT_SYMBOL_GPL(power_supply_set_battery_charged);
143
144 static int power_supply_match_device_by_name(struct device *dev, void *data)
145 {
146         const char *name = data;
147         struct power_supply *psy = dev_get_drvdata(dev);
148
149         return strcmp(psy->name, name) == 0;
150 }
151
152 struct power_supply *power_supply_get_by_name(char *name)
153 {
154         struct device *dev = class_find_device(power_supply_class, NULL, name,
155                                         power_supply_match_device_by_name);
156
157         return dev ? dev_get_drvdata(dev) : NULL;
158 }
159 EXPORT_SYMBOL_GPL(power_supply_get_by_name);
160
161 int power_supply_powers(struct power_supply *psy, struct device *dev)
162 {
163         return sysfs_create_link(&psy->dev->kobj, &dev->kobj, "powers");
164 }
165 EXPORT_SYMBOL_GPL(power_supply_powers);
166
167 static void power_supply_dev_release(struct device *dev)
168 {
169         pr_debug("device: '%s': %s\n", dev_name(dev), __func__);
170         kfree(dev);
171 }
172
173 #ifdef CONFIG_THERMAL
174 static int power_supply_read_temp(struct thermal_zone_device *tzd,
175                 unsigned long *temp)
176 {
177         struct power_supply *psy;
178         union power_supply_propval val;
179         int ret;
180
181         WARN_ON(tzd == NULL);
182         psy = tzd->devdata;
183         ret = psy->get_property(psy, POWER_SUPPLY_PROP_TEMP, &val);
184
185         /* Convert tenths of degree Celsius to milli degree Celsius. */
186         if (!ret)
187                 *temp = val.intval * 100;
188
189         return ret;
190 }
191
192 static struct thermal_zone_device_ops psy_tzd_ops = {
193         .get_temp = power_supply_read_temp,
194 };
195
196 static int psy_register_thermal(struct power_supply *psy)
197 {
198         int i;
199
200         /* Register battery zone device psy reports temperature */
201         for (i = 0; i < psy->num_properties; i++) {
202                 if (psy->properties[i] == POWER_SUPPLY_PROP_TEMP) {
203                         psy->tzd = thermal_zone_device_register(psy->name, 0, 0,
204                                         psy, &psy_tzd_ops, NULL, 0, 0);
205                         if (IS_ERR(psy->tzd))
206                                 return PTR_ERR(psy->tzd);
207                         break;
208                 }
209         }
210         return 0;
211 }
212
213 static void psy_unregister_thermal(struct power_supply *psy)
214 {
215         if (IS_ERR_OR_NULL(psy->tzd))
216                 return;
217         thermal_zone_device_unregister(psy->tzd);
218 }
219
220 /* thermal cooling device callbacks */
221 static int ps_get_max_charge_cntl_limit(struct thermal_cooling_device *tcd,
222                                         unsigned long *state)
223 {
224         struct power_supply *psy;
225         union power_supply_propval val;
226         int ret;
227
228         psy = tcd->devdata;
229         ret = psy->get_property(psy,
230                 POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT_MAX, &val);
231         if (!ret)
232                 *state = val.intval;
233
234         return ret;
235 }
236
237 static int ps_get_cur_chrage_cntl_limit(struct thermal_cooling_device *tcd,
238                                         unsigned long *state)
239 {
240         struct power_supply *psy;
241         union power_supply_propval val;
242         int ret;
243
244         psy = tcd->devdata;
245         ret = psy->get_property(psy,
246                 POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT, &val);
247         if (!ret)
248                 *state = val.intval;
249
250         return ret;
251 }
252
253 static int ps_set_cur_charge_cntl_limit(struct thermal_cooling_device *tcd,
254                                         unsigned long state)
255 {
256         struct power_supply *psy;
257         union power_supply_propval val;
258         int ret;
259
260         psy = tcd->devdata;
261         val.intval = state;
262         ret = psy->set_property(psy,
263                 POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT, &val);
264
265         return ret;
266 }
267
268 static struct thermal_cooling_device_ops psy_tcd_ops = {
269         .get_max_state = ps_get_max_charge_cntl_limit,
270         .get_cur_state = ps_get_cur_chrage_cntl_limit,
271         .set_cur_state = ps_set_cur_charge_cntl_limit,
272 };
273
274 static int psy_register_cooler(struct power_supply *psy)
275 {
276         int i;
277
278         /* Register for cooling device if psy can control charging */
279         for (i = 0; i < psy->num_properties; i++) {
280                 if (psy->properties[i] ==
281                                 POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT) {
282                         psy->tcd = thermal_cooling_device_register(
283                                                         (char *)psy->name,
284                                                         psy, &psy_tcd_ops);
285                         if (IS_ERR(psy->tcd))
286                                 return PTR_ERR(psy->tcd);
287                         break;
288                 }
289         }
290         return 0;
291 }
292
293 static void psy_unregister_cooler(struct power_supply *psy)
294 {
295         if (IS_ERR_OR_NULL(psy->tcd))
296                 return;
297         thermal_cooling_device_unregister(psy->tcd);
298 }
299 #else
300 static int psy_register_thermal(struct power_supply *psy)
301 {
302         return 0;
303 }
304
305 static void psy_unregister_thermal(struct power_supply *psy)
306 {
307 }
308
309 static int psy_register_cooler(struct power_supply *psy)
310 {
311         return 0;
312 }
313
314 static void psy_unregister_cooler(struct power_supply *psy)
315 {
316 }
317 #endif
318
319 int power_supply_register(struct device *parent, struct power_supply *psy)
320 {
321         struct device *dev;
322         int rc;
323
324         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
325         if (!dev)
326                 return -ENOMEM;
327
328         device_initialize(dev);
329
330         dev->class = power_supply_class;
331         dev->type = &power_supply_dev_type;
332         dev->parent = parent;
333         dev->release = power_supply_dev_release;
334         dev_set_drvdata(dev, psy);
335         psy->dev = dev;
336
337         INIT_WORK(&psy->changed_work, power_supply_changed_work);
338
339         rc = kobject_set_name(&dev->kobj, "%s", psy->name);
340         if (rc)
341                 goto kobject_set_name_failed;
342
343         rc = device_add(dev);
344         if (rc)
345                 goto device_add_failed;
346
347         rc = psy_register_thermal(psy);
348         if (rc)
349                 goto register_thermal_failed;
350
351         rc = psy_register_cooler(psy);
352         if (rc)
353                 goto register_cooler_failed;
354
355         rc = power_supply_create_triggers(psy);
356         if (rc)
357                 goto create_triggers_failed;
358
359         power_supply_changed(psy);
360
361         goto success;
362
363 create_triggers_failed:
364         psy_unregister_cooler(psy);
365 register_cooler_failed:
366         psy_unregister_thermal(psy);
367 register_thermal_failed:
368         device_del(dev);
369 kobject_set_name_failed:
370 device_add_failed:
371         put_device(dev);
372 success:
373         return rc;
374 }
375 EXPORT_SYMBOL_GPL(power_supply_register);
376
377 void power_supply_unregister(struct power_supply *psy)
378 {
379         cancel_work_sync(&psy->changed_work);
380         sysfs_remove_link(&psy->dev->kobj, "powers");
381         power_supply_remove_triggers(psy);
382         psy_unregister_cooler(psy);
383         psy_unregister_thermal(psy);
384         device_unregister(psy->dev);
385 }
386 EXPORT_SYMBOL_GPL(power_supply_unregister);
387
388 static int __init power_supply_class_init(void)
389 {
390         power_supply_class = class_create(THIS_MODULE, "power_supply");
391
392         if (IS_ERR(power_supply_class))
393                 return PTR_ERR(power_supply_class);
394
395         power_supply_class->dev_uevent = power_supply_uevent;
396         power_supply_init_attrs(&power_supply_dev_type);
397
398         return 0;
399 }
400
401 static void __exit power_supply_class_exit(void)
402 {
403         class_destroy(power_supply_class);
404 }
405
406 subsys_initcall(power_supply_class_init);
407 module_exit(power_supply_class_exit);
408
409 MODULE_DESCRIPTION("Universal power supply monitor class");
410 MODULE_AUTHOR("Ian Molton <spyro@f2s.com>, "
411               "Szabolcs Gyurko, "
412               "Anton Vorontsov <cbou@mail.ru>");
413 MODULE_LICENSE("GPL");