Merge branch 'devel' of git://git.kernel.org/pub/scm/linux/kernel/git/ycmiao/pxa...
[linux-2.6.git] / drivers / power / apm_power.c
1 /*
2  * Copyright © 2007 Anton Vorontsov <cbou@mail.ru>
3  * Copyright © 2007 Eugeny Boger <eugenyboger@dgap.mipt.ru>
4  *
5  * Author: Eugeny Boger <eugenyboger@dgap.mipt.ru>
6  *
7  * Use consistent with the GNU GPL is permitted,
8  * provided that this copyright notice is
9  * preserved in its entirety in all copies and derived works.
10  */
11
12 #include <linux/module.h>
13 #include <linux/power_supply.h>
14 #include <linux/apm-emulation.h>
15
16
17 #define PSY_PROP(psy, prop, val) psy->get_property(psy, \
18                          POWER_SUPPLY_PROP_##prop, val)
19
20 #define _MPSY_PROP(prop, val) main_battery->get_property(main_battery, \
21                                                          prop, val)
22
23 #define MPSY_PROP(prop, val) _MPSY_PROP(POWER_SUPPLY_PROP_##prop, val)
24
25 static DEFINE_MUTEX(apm_mutex);
26 static struct power_supply *main_battery;
27
28 enum apm_source {
29         SOURCE_ENERGY,
30         SOURCE_CHARGE,
31         SOURCE_VOLTAGE,
32 };
33
34 struct find_bat_param {
35         struct power_supply *main;
36         struct power_supply *bat;
37         struct power_supply *max_charge_bat;
38         struct power_supply *max_energy_bat;
39         union power_supply_propval full;
40         int max_charge;
41         int max_energy;
42 };
43
44 static int __find_main_battery(struct device *dev, void *data)
45 {
46         struct find_bat_param *bp = (struct find_bat_param *)data;
47
48         bp->bat = dev_get_drvdata(dev);
49
50         if (bp->bat->use_for_apm) {
51                 /* nice, we explicitly asked to report this battery. */
52                 bp->main = bp->bat;
53                 return 1;
54         }
55
56         if (!PSY_PROP(bp->bat, CHARGE_FULL_DESIGN, &bp->full) ||
57                         !PSY_PROP(bp->bat, CHARGE_FULL, &bp->full)) {
58                 if (bp->full.intval > bp->max_charge) {
59                         bp->max_charge_bat = bp->bat;
60                         bp->max_charge = bp->full.intval;
61                 }
62         } else if (!PSY_PROP(bp->bat, ENERGY_FULL_DESIGN, &bp->full) ||
63                         !PSY_PROP(bp->bat, ENERGY_FULL, &bp->full)) {
64                 if (bp->full.intval > bp->max_energy) {
65                         bp->max_energy_bat = bp->bat;
66                         bp->max_energy = bp->full.intval;
67                 }
68         }
69         return 0;
70 }
71
72 static void find_main_battery(void)
73 {
74         struct find_bat_param bp;
75         int error;
76
77         memset(&bp, 0, sizeof(struct find_bat_param));
78         main_battery = NULL;
79         bp.main = main_battery;
80
81         error = class_for_each_device(power_supply_class, NULL, &bp,
82                                       __find_main_battery);
83         if (error) {
84                 main_battery = bp.main;
85                 return;
86         }
87
88         if ((bp.max_energy_bat && bp.max_charge_bat) &&
89                         (bp.max_energy_bat != bp.max_charge_bat)) {
90                 /* try guess battery with more capacity */
91                 if (!PSY_PROP(bp.max_charge_bat, VOLTAGE_MAX_DESIGN,
92                               &bp.full)) {
93                         if (bp.max_energy > bp.max_charge * bp.full.intval)
94                                 main_battery = bp.max_energy_bat;
95                         else
96                                 main_battery = bp.max_charge_bat;
97                 } else if (!PSY_PROP(bp.max_energy_bat, VOLTAGE_MAX_DESIGN,
98                                                                   &bp.full)) {
99                         if (bp.max_charge > bp.max_energy / bp.full.intval)
100                                 main_battery = bp.max_charge_bat;
101                         else
102                                 main_battery = bp.max_energy_bat;
103                 } else {
104                         /* give up, choice any */
105                         main_battery = bp.max_energy_bat;
106                 }
107         } else if (bp.max_charge_bat) {
108                 main_battery = bp.max_charge_bat;
109         } else if (bp.max_energy_bat) {
110                 main_battery = bp.max_energy_bat;
111         } else {
112                 /* give up, try the last if any */
113                 main_battery = bp.bat;
114         }
115 }
116
117 static int do_calculate_time(int status, enum apm_source source)
118 {
119         union power_supply_propval full;
120         union power_supply_propval empty;
121         union power_supply_propval cur;
122         union power_supply_propval I;
123         enum power_supply_property full_prop;
124         enum power_supply_property full_design_prop;
125         enum power_supply_property empty_prop;
126         enum power_supply_property empty_design_prop;
127         enum power_supply_property cur_avg_prop;
128         enum power_supply_property cur_now_prop;
129
130         if (MPSY_PROP(CURRENT_AVG, &I)) {
131                 /* if battery can't report average value, use momentary */
132                 if (MPSY_PROP(CURRENT_NOW, &I))
133                         return -1;
134         }
135
136         if (!I.intval)
137                 return 0;
138
139         switch (source) {
140         case SOURCE_CHARGE:
141                 full_prop = POWER_SUPPLY_PROP_CHARGE_FULL;
142                 full_design_prop = POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN;
143                 empty_prop = POWER_SUPPLY_PROP_CHARGE_EMPTY;
144                 empty_design_prop = POWER_SUPPLY_PROP_CHARGE_EMPTY;
145                 cur_avg_prop = POWER_SUPPLY_PROP_CHARGE_AVG;
146                 cur_now_prop = POWER_SUPPLY_PROP_CHARGE_NOW;
147                 break;
148         case SOURCE_ENERGY:
149                 full_prop = POWER_SUPPLY_PROP_ENERGY_FULL;
150                 full_design_prop = POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN;
151                 empty_prop = POWER_SUPPLY_PROP_ENERGY_EMPTY;
152                 empty_design_prop = POWER_SUPPLY_PROP_CHARGE_EMPTY;
153                 cur_avg_prop = POWER_SUPPLY_PROP_ENERGY_AVG;
154                 cur_now_prop = POWER_SUPPLY_PROP_ENERGY_NOW;
155                 break;
156         case SOURCE_VOLTAGE:
157                 full_prop = POWER_SUPPLY_PROP_VOLTAGE_MAX;
158                 full_design_prop = POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN;
159                 empty_prop = POWER_SUPPLY_PROP_VOLTAGE_MIN;
160                 empty_design_prop = POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN;
161                 cur_avg_prop = POWER_SUPPLY_PROP_VOLTAGE_AVG;
162                 cur_now_prop = POWER_SUPPLY_PROP_VOLTAGE_NOW;
163                 break;
164         default:
165                 printk(KERN_ERR "Unsupported source: %d\n", source);
166                 return -1;
167         }
168
169         if (_MPSY_PROP(full_prop, &full)) {
170                 /* if battery can't report this property, use design value */
171                 if (_MPSY_PROP(full_design_prop, &full))
172                         return -1;
173         }
174
175         if (_MPSY_PROP(empty_prop, &empty)) {
176                 /* if battery can't report this property, use design value */
177                 if (_MPSY_PROP(empty_design_prop, &empty))
178                         empty.intval = 0;
179         }
180
181         if (_MPSY_PROP(cur_avg_prop, &cur)) {
182                 /* if battery can't report average value, use momentary */
183                 if (_MPSY_PROP(cur_now_prop, &cur))
184                         return -1;
185         }
186
187         if (status == POWER_SUPPLY_STATUS_CHARGING)
188                 return ((cur.intval - full.intval) * 60L) / I.intval;
189         else
190                 return -((cur.intval - empty.intval) * 60L) / I.intval;
191 }
192
193 static int calculate_time(int status)
194 {
195         int time;
196
197         time = do_calculate_time(status, SOURCE_ENERGY);
198         if (time != -1)
199                 return time;
200
201         time = do_calculate_time(status, SOURCE_CHARGE);
202         if (time != -1)
203                 return time;
204
205         time = do_calculate_time(status, SOURCE_VOLTAGE);
206         if (time != -1)
207                 return time;
208
209         return -1;
210 }
211
212 static int calculate_capacity(enum apm_source source)
213 {
214         enum power_supply_property full_prop, empty_prop;
215         enum power_supply_property full_design_prop, empty_design_prop;
216         enum power_supply_property now_prop, avg_prop;
217         union power_supply_propval empty, full, cur;
218         int ret;
219
220         switch (source) {
221         case SOURCE_CHARGE:
222                 full_prop = POWER_SUPPLY_PROP_CHARGE_FULL;
223                 empty_prop = POWER_SUPPLY_PROP_CHARGE_EMPTY;
224                 full_design_prop = POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN;
225                 empty_design_prop = POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN;
226                 now_prop = POWER_SUPPLY_PROP_CHARGE_NOW;
227                 avg_prop = POWER_SUPPLY_PROP_CHARGE_AVG;
228                 break;
229         case SOURCE_ENERGY:
230                 full_prop = POWER_SUPPLY_PROP_ENERGY_FULL;
231                 empty_prop = POWER_SUPPLY_PROP_ENERGY_EMPTY;
232                 full_design_prop = POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN;
233                 empty_design_prop = POWER_SUPPLY_PROP_ENERGY_EMPTY_DESIGN;
234                 now_prop = POWER_SUPPLY_PROP_ENERGY_NOW;
235                 avg_prop = POWER_SUPPLY_PROP_ENERGY_AVG;
236         case SOURCE_VOLTAGE:
237                 full_prop = POWER_SUPPLY_PROP_VOLTAGE_MAX;
238                 empty_prop = POWER_SUPPLY_PROP_VOLTAGE_MIN;
239                 full_design_prop = POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN;
240                 empty_design_prop = POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN;
241                 now_prop = POWER_SUPPLY_PROP_VOLTAGE_NOW;
242                 avg_prop = POWER_SUPPLY_PROP_VOLTAGE_AVG;
243                 break;
244         default:
245                 printk(KERN_ERR "Unsupported source: %d\n", source);
246                 return -1;
247         }
248
249         if (_MPSY_PROP(full_prop, &full)) {
250                 /* if battery can't report this property, use design value */
251                 if (_MPSY_PROP(full_design_prop, &full))
252                         return -1;
253         }
254
255         if (_MPSY_PROP(avg_prop, &cur)) {
256                 /* if battery can't report average value, use momentary */
257                 if (_MPSY_PROP(now_prop, &cur))
258                         return -1;
259         }
260
261         if (_MPSY_PROP(empty_prop, &empty)) {
262                 /* if battery can't report this property, use design value */
263                 if (_MPSY_PROP(empty_design_prop, &empty))
264                         empty.intval = 0;
265         }
266
267         if (full.intval - empty.intval)
268                 ret =  ((cur.intval - empty.intval) * 100L) /
269                        (full.intval - empty.intval);
270         else
271                 return -1;
272
273         if (ret > 100)
274                 return 100;
275         else if (ret < 0)
276                 return 0;
277
278         return ret;
279 }
280
281 static void apm_battery_apm_get_power_status(struct apm_power_info *info)
282 {
283         union power_supply_propval status;
284         union power_supply_propval capacity, time_to_full, time_to_empty;
285
286         mutex_lock(&apm_mutex);
287         find_main_battery();
288         if (!main_battery) {
289                 mutex_unlock(&apm_mutex);
290                 return;
291         }
292
293         /* status */
294
295         if (MPSY_PROP(STATUS, &status))
296                 status.intval = POWER_SUPPLY_STATUS_UNKNOWN;
297
298         /* ac line status */
299
300         if ((status.intval == POWER_SUPPLY_STATUS_CHARGING) ||
301             (status.intval == POWER_SUPPLY_STATUS_NOT_CHARGING) ||
302             (status.intval == POWER_SUPPLY_STATUS_FULL))
303                 info->ac_line_status = APM_AC_ONLINE;
304         else
305                 info->ac_line_status = APM_AC_OFFLINE;
306
307         /* battery life (i.e. capacity, in percents) */
308
309         if (MPSY_PROP(CAPACITY, &capacity) == 0) {
310                 info->battery_life = capacity.intval;
311         } else {
312                 /* try calculate using energy */
313                 info->battery_life = calculate_capacity(SOURCE_ENERGY);
314                 /* if failed try calculate using charge instead */
315                 if (info->battery_life == -1)
316                         info->battery_life = calculate_capacity(SOURCE_CHARGE);
317                 if (info->battery_life == -1)
318                         info->battery_life = calculate_capacity(SOURCE_VOLTAGE);
319         }
320
321         /* charging status */
322
323         if (status.intval == POWER_SUPPLY_STATUS_CHARGING) {
324                 info->battery_status = APM_BATTERY_STATUS_CHARGING;
325         } else {
326                 if (info->battery_life > 50)
327                         info->battery_status = APM_BATTERY_STATUS_HIGH;
328                 else if (info->battery_life > 5)
329                         info->battery_status = APM_BATTERY_STATUS_LOW;
330                 else
331                         info->battery_status = APM_BATTERY_STATUS_CRITICAL;
332         }
333         info->battery_flag = info->battery_status;
334
335         /* time */
336
337         info->units = APM_UNITS_MINS;
338
339         if (status.intval == POWER_SUPPLY_STATUS_CHARGING) {
340                 if (!MPSY_PROP(TIME_TO_FULL_AVG, &time_to_full) ||
341                                 !MPSY_PROP(TIME_TO_FULL_NOW, &time_to_full))
342                         info->time = time_to_full.intval / 60;
343                 else
344                         info->time = calculate_time(status.intval);
345         } else {
346                 if (!MPSY_PROP(TIME_TO_EMPTY_AVG, &time_to_empty) ||
347                               !MPSY_PROP(TIME_TO_EMPTY_NOW, &time_to_empty))
348                         info->time = time_to_empty.intval / 60;
349                 else
350                         info->time = calculate_time(status.intval);
351         }
352
353         mutex_unlock(&apm_mutex);
354 }
355
356 static int __init apm_battery_init(void)
357 {
358         printk(KERN_INFO "APM Battery Driver\n");
359
360         apm_get_power_status = apm_battery_apm_get_power_status;
361         return 0;
362 }
363
364 static void __exit apm_battery_exit(void)
365 {
366         apm_get_power_status = NULL;
367 }
368
369 module_init(apm_battery_init);
370 module_exit(apm_battery_exit);
371
372 MODULE_AUTHOR("Eugeny Boger <eugenyboger@dgap.mipt.ru>");
373 MODULE_DESCRIPTION("APM emulation driver for battery monitoring class");
374 MODULE_LICENSE("GPL");