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
__find_main_battery(struct device * dev,void * data)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
find_main_battery(void)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
do_calculate_time(int status,enum apm_source source)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
calculate_time(int status)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
calculate_capacity(enum apm_source source)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
apm_battery_apm_get_power_status(struct apm_power_info * info)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
apm_battery_init(void)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
apm_battery_exit(void)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");
375