Commit | Line | Data |
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4a11b59d AV |
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> | |
5f487cd3 | 16 | #include <linux/slab.h> |
4a11b59d AV |
17 | #include <linux/device.h> |
18 | #include <linux/err.h> | |
19 | #include <linux/power_supply.h> | |
3be330bf | 20 | #include <linux/thermal.h> |
4a11b59d AV |
21 | #include "power_supply.h" |
22 | ||
ff3417e7 | 23 | /* exported for the APM Power driver, APM emulation */ |
4a11b59d | 24 | struct class *power_supply_class; |
ff3417e7 | 25 | EXPORT_SYMBOL_GPL(power_supply_class); |
4a11b59d | 26 | |
5f487cd3 AV |
27 | static struct device_type power_supply_dev_type; |
28 | ||
443cad92 DY |
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 | ||
4a11b59d AV |
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); | |
4a11b59d | 47 | |
0cddc0a9 | 48 | dev_dbg(psy->dev, "%s\n", __func__); |
4a11b59d | 49 | |
93562b53 | 50 | class_for_each_device(power_supply_class, NULL, psy, |
443cad92 | 51 | __power_supply_changed_work); |
4a11b59d AV |
52 | |
53 | power_supply_update_leds(psy); | |
54 | ||
55 | kobject_uevent(&psy->dev->kobj, KOBJ_CHANGE); | |
4a11b59d AV |
56 | } |
57 | ||
58 | void power_supply_changed(struct power_supply *psy) | |
59 | { | |
0cddc0a9 | 60 | dev_dbg(psy->dev, "%s\n", __func__); |
4a11b59d AV |
61 | |
62 | schedule_work(&psy->changed_work); | |
4a11b59d | 63 | } |
ff3417e7 | 64 | EXPORT_SYMBOL_GPL(power_supply_changed); |
4a11b59d | 65 | |
443cad92 | 66 | static int __power_supply_am_i_supplied(struct device *dev, void *data) |
4a11b59d AV |
67 | { |
68 | union power_supply_propval ret = {0,}; | |
443cad92 DY |
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; | |
4a11b59d AV |
80 | } |
81 | } | |
443cad92 DY |
82 | return 0; |
83 | } | |
84 | ||
85 | int power_supply_am_i_supplied(struct power_supply *psy) | |
86 | { | |
87 | int error; | |
88 | ||
93562b53 | 89 | error = class_for_each_device(power_supply_class, NULL, psy, |
443cad92 | 90 | __power_supply_am_i_supplied); |
4a11b59d | 91 | |
0cddc0a9 | 92 | dev_dbg(psy->dev, "%s %d\n", __func__, error); |
4a11b59d | 93 | |
443cad92 | 94 | return error; |
4a11b59d | 95 | } |
ff3417e7 | 96 | EXPORT_SYMBOL_GPL(power_supply_am_i_supplied); |
4a11b59d | 97 | |
942ed161 MG |
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); | |
2530daa1 | 102 | unsigned int *count = data; |
942ed161 | 103 | |
2530daa1 | 104 | (*count)++; |
942ed161 MG |
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; | |
2530daa1 | 117 | unsigned int count = 0; |
942ed161 | 118 | |
2530daa1 | 119 | error = class_for_each_device(power_supply_class, NULL, &count, |
942ed161 MG |
120 | __power_supply_is_system_supplied); |
121 | ||
2530daa1 JD |
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 | ||
942ed161 MG |
129 | return error; |
130 | } | |
ff3417e7 | 131 | EXPORT_SYMBOL_GPL(power_supply_is_system_supplied); |
942ed161 | 132 | |
e5f5ccb6 DM |
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 | ||
83516651 JF |
161 | int power_supply_powers(struct power_supply *psy, struct device *dev) |
162 | { | |
93278d15 | 163 | return sysfs_create_link(&psy->dev->kobj, &dev->kobj, "powers"); |
83516651 JF |
164 | } |
165 | EXPORT_SYMBOL_GPL(power_supply_powers); | |
166 | ||
5f487cd3 AV |
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 | ||
3be330bf JT |
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) { | |
e6db06a5 | 203 | psy->tzd = thermal_zone_device_register(psy->name, 0, 0, |
3be330bf JT |
204 | psy, &psy_tzd_ops, 0, 0, 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 | #else | |
220 | static int psy_register_thermal(struct power_supply *psy) | |
221 | { | |
222 | return 0; | |
223 | } | |
224 | ||
225 | static void psy_unregister_thermal(struct power_supply *psy) | |
226 | { | |
227 | } | |
228 | #endif | |
229 | ||
4a11b59d AV |
230 | int power_supply_register(struct device *parent, struct power_supply *psy) |
231 | { | |
5f487cd3 AV |
232 | struct device *dev; |
233 | int rc; | |
4a11b59d | 234 | |
5f487cd3 AV |
235 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
236 | if (!dev) | |
237 | return -ENOMEM; | |
4a11b59d | 238 | |
5f487cd3 | 239 | device_initialize(dev); |
4a11b59d | 240 | |
5f487cd3 AV |
241 | dev->class = power_supply_class; |
242 | dev->type = &power_supply_dev_type; | |
243 | dev->parent = parent; | |
244 | dev->release = power_supply_dev_release; | |
245 | dev_set_drvdata(dev, psy); | |
246 | psy->dev = dev; | |
247 | ||
97774672 LPC |
248 | INIT_WORK(&psy->changed_work, power_supply_changed_work); |
249 | ||
5f487cd3 AV |
250 | rc = kobject_set_name(&dev->kobj, "%s", psy->name); |
251 | if (rc) | |
252 | goto kobject_set_name_failed; | |
253 | ||
254 | rc = device_add(dev); | |
4a11b59d | 255 | if (rc) |
5f487cd3 AV |
256 | goto device_add_failed; |
257 | ||
3be330bf JT |
258 | rc = psy_register_thermal(psy); |
259 | if (rc) | |
260 | goto register_thermal_failed; | |
261 | ||
4a11b59d AV |
262 | rc = power_supply_create_triggers(psy); |
263 | if (rc) | |
264 | goto create_triggers_failed; | |
265 | ||
266 | power_supply_changed(psy); | |
267 | ||
268 | goto success; | |
269 | ||
270 | create_triggers_failed: | |
3be330bf JT |
271 | psy_unregister_thermal(psy); |
272 | register_thermal_failed: | |
3a2dbd61 | 273 | device_del(dev); |
5f487cd3 AV |
274 | kobject_set_name_failed: |
275 | device_add_failed: | |
3a2dbd61 | 276 | put_device(dev); |
4a11b59d AV |
277 | success: |
278 | return rc; | |
279 | } | |
ff3417e7 | 280 | EXPORT_SYMBOL_GPL(power_supply_register); |
4a11b59d AV |
281 | |
282 | void power_supply_unregister(struct power_supply *psy) | |
283 | { | |
bc51e7ff | 284 | cancel_work_sync(&psy->changed_work); |
83516651 | 285 | sysfs_remove_link(&psy->dev->kobj, "powers"); |
4a11b59d | 286 | power_supply_remove_triggers(psy); |
3be330bf | 287 | psy_unregister_thermal(psy); |
4a11b59d | 288 | device_unregister(psy->dev); |
4a11b59d | 289 | } |
ff3417e7 | 290 | EXPORT_SYMBOL_GPL(power_supply_unregister); |
4a11b59d AV |
291 | |
292 | static int __init power_supply_class_init(void) | |
293 | { | |
294 | power_supply_class = class_create(THIS_MODULE, "power_supply"); | |
295 | ||
296 | if (IS_ERR(power_supply_class)) | |
297 | return PTR_ERR(power_supply_class); | |
298 | ||
299 | power_supply_class->dev_uevent = power_supply_uevent; | |
5f487cd3 | 300 | power_supply_init_attrs(&power_supply_dev_type); |
4a11b59d AV |
301 | |
302 | return 0; | |
303 | } | |
304 | ||
305 | static void __exit power_supply_class_exit(void) | |
306 | { | |
307 | class_destroy(power_supply_class); | |
4a11b59d AV |
308 | } |
309 | ||
4a11b59d AV |
310 | subsys_initcall(power_supply_class_init); |
311 | module_exit(power_supply_class_exit); | |
312 | ||
313 | MODULE_DESCRIPTION("Universal power supply monitor class"); | |
314 | MODULE_AUTHOR("Ian Molton <spyro@f2s.com>, " | |
315 | "Szabolcs Gyurko, " | |
316 | "Anton Vorontsov <cbou@mail.ru>"); | |
317 | MODULE_LICENSE("GPL"); |