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