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/device.h>
14 #include <linux/power_supply.h>
15 #include <linux/apm-emulation.h>
16
17
18 #define PSY_PROP(psy, prop, val) (power_supply_get_property(psy, \
19 POWER_SUPPLY_PROP_##prop, val))
20
21 #define _MPSY_PROP(prop, val) (power_supply_get_property(main_battery, \
22 prop, val))
23
24 #define MPSY_PROP(prop, val) _MPSY_PROP(POWER_SUPPLY_PROP_##prop, val)
25
26 static DEFINE_MUTEX(apm_mutex);
27 static struct power_supply *main_battery;
28
29 enum apm_source {
30 SOURCE_ENERGY,
31 SOURCE_CHARGE,
32 SOURCE_VOLTAGE,
33 };
34
35 struct find_bat_param {
36 struct power_supply *main;
37 struct power_supply *bat;
38 struct power_supply *max_charge_bat;
39 struct power_supply *max_energy_bat;
40 union power_supply_propval full;
41 int max_charge;
42 int max_energy;
43 };
44
__find_main_battery(struct device * dev,void * data)45 static int __find_main_battery(struct device *dev, void *data)
46 {
47 struct find_bat_param *bp = (struct find_bat_param *)data;
48
49 bp->bat = dev_get_drvdata(dev);
50
51 if (bp->bat->desc->use_for_apm) {
52 /* nice, we explicitly asked to report this battery. */
53 bp->main = bp->bat;
54 return 1;
55 }
56
57 if (!PSY_PROP(bp->bat, CHARGE_FULL_DESIGN, &bp->full) ||
58 !PSY_PROP(bp->bat, CHARGE_FULL, &bp->full)) {
59 if (bp->full.intval > bp->max_charge) {
60 bp->max_charge_bat = bp->bat;
61 bp->max_charge = bp->full.intval;
62 }
63 } else if (!PSY_PROP(bp->bat, ENERGY_FULL_DESIGN, &bp->full) ||
64 !PSY_PROP(bp->bat, ENERGY_FULL, &bp->full)) {
65 if (bp->full.intval > bp->max_energy) {
66 bp->max_energy_bat = bp->bat;
67 bp->max_energy = bp->full.intval;
68 }
69 }
70 return 0;
71 }
72
find_main_battery(void)73 static void find_main_battery(void)
74 {
75 struct find_bat_param bp;
76 int error;
77
78 memset(&bp, 0, sizeof(struct find_bat_param));
79 main_battery = NULL;
80 bp.main = main_battery;
81
82 error = class_for_each_device(power_supply_class, NULL, &bp,
83 __find_main_battery);
84 if (error) {
85 main_battery = bp.main;
86 return;
87 }
88
89 if ((bp.max_energy_bat && bp.max_charge_bat) &&
90 (bp.max_energy_bat != bp.max_charge_bat)) {
91 /* try guess battery with more capacity */
92 if (!PSY_PROP(bp.max_charge_bat, VOLTAGE_MAX_DESIGN,
93 &bp.full)) {
94 if (bp.max_energy > bp.max_charge * bp.full.intval)
95 main_battery = bp.max_energy_bat;
96 else
97 main_battery = bp.max_charge_bat;
98 } else if (!PSY_PROP(bp.max_energy_bat, VOLTAGE_MAX_DESIGN,
99 &bp.full)) {
100 if (bp.max_charge > bp.max_energy / bp.full.intval)
101 main_battery = bp.max_charge_bat;
102 else
103 main_battery = bp.max_energy_bat;
104 } else {
105 /* give up, choice any */
106 main_battery = bp.max_energy_bat;
107 }
108 } else if (bp.max_charge_bat) {
109 main_battery = bp.max_charge_bat;
110 } else if (bp.max_energy_bat) {
111 main_battery = bp.max_energy_bat;
112 } else {
113 /* give up, try the last if any */
114 main_battery = bp.bat;
115 }
116 }
117
do_calculate_time(int status,enum apm_source source)118 static int do_calculate_time(int status, enum apm_source source)
119 {
120 union power_supply_propval full;
121 union power_supply_propval empty;
122 union power_supply_propval cur;
123 union power_supply_propval I;
124 enum power_supply_property full_prop;
125 enum power_supply_property full_design_prop;
126 enum power_supply_property empty_prop;
127 enum power_supply_property empty_design_prop;
128 enum power_supply_property cur_avg_prop;
129 enum power_supply_property cur_now_prop;
130
131 if (MPSY_PROP(CURRENT_AVG, &I)) {
132 /* if battery can't report average value, use momentary */
133 if (MPSY_PROP(CURRENT_NOW, &I))
134 return -1;
135 }
136
137 if (!I.intval)
138 return 0;
139
140 switch (source) {
141 case SOURCE_CHARGE:
142 full_prop = POWER_SUPPLY_PROP_CHARGE_FULL;
143 full_design_prop = POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN;
144 empty_prop = POWER_SUPPLY_PROP_CHARGE_EMPTY;
145 empty_design_prop = POWER_SUPPLY_PROP_CHARGE_EMPTY;
146 cur_avg_prop = POWER_SUPPLY_PROP_CHARGE_AVG;
147 cur_now_prop = POWER_SUPPLY_PROP_CHARGE_NOW;
148 break;
149 case SOURCE_ENERGY:
150 full_prop = POWER_SUPPLY_PROP_ENERGY_FULL;
151 full_design_prop = POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN;
152 empty_prop = POWER_SUPPLY_PROP_ENERGY_EMPTY;
153 empty_design_prop = POWER_SUPPLY_PROP_CHARGE_EMPTY;
154 cur_avg_prop = POWER_SUPPLY_PROP_ENERGY_AVG;
155 cur_now_prop = POWER_SUPPLY_PROP_ENERGY_NOW;
156 break;
157 case SOURCE_VOLTAGE:
158 full_prop = POWER_SUPPLY_PROP_VOLTAGE_MAX;
159 full_design_prop = POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN;
160 empty_prop = POWER_SUPPLY_PROP_VOLTAGE_MIN;
161 empty_design_prop = POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN;
162 cur_avg_prop = POWER_SUPPLY_PROP_VOLTAGE_AVG;
163 cur_now_prop = POWER_SUPPLY_PROP_VOLTAGE_NOW;
164 break;
165 default:
166 printk(KERN_ERR "Unsupported source: %d\n", source);
167 return -1;
168 }
169
170 if (_MPSY_PROP(full_prop, &full)) {
171 /* if battery can't report this property, use design value */
172 if (_MPSY_PROP(full_design_prop, &full))
173 return -1;
174 }
175
176 if (_MPSY_PROP(empty_prop, &empty)) {
177 /* if battery can't report this property, use design value */
178 if (_MPSY_PROP(empty_design_prop, &empty))
179 empty.intval = 0;
180 }
181
182 if (_MPSY_PROP(cur_avg_prop, &cur)) {
183 /* if battery can't report average value, use momentary */
184 if (_MPSY_PROP(cur_now_prop, &cur))
185 return -1;
186 }
187
188 if (status == POWER_SUPPLY_STATUS_CHARGING)
189 return ((cur.intval - full.intval) * 60L) / I.intval;
190 else
191 return -((cur.intval - empty.intval) * 60L) / I.intval;
192 }
193
calculate_time(int status)194 static int calculate_time(int status)
195 {
196 int time;
197
198 time = do_calculate_time(status, SOURCE_ENERGY);
199 if (time != -1)
200 return time;
201
202 time = do_calculate_time(status, SOURCE_CHARGE);
203 if (time != -1)
204 return time;
205
206 time = do_calculate_time(status, SOURCE_VOLTAGE);
207 if (time != -1)
208 return time;
209
210 return -1;
211 }
212
calculate_capacity(enum apm_source source)213 static int calculate_capacity(enum apm_source source)
214 {
215 enum power_supply_property full_prop, empty_prop;
216 enum power_supply_property full_design_prop, empty_design_prop;
217 enum power_supply_property now_prop, avg_prop;
218 union power_supply_propval empty, full, cur;
219 int ret;
220
221 switch (source) {
222 case SOURCE_CHARGE:
223 full_prop = POWER_SUPPLY_PROP_CHARGE_FULL;
224 empty_prop = POWER_SUPPLY_PROP_CHARGE_EMPTY;
225 full_design_prop = POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN;
226 empty_design_prop = POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN;
227 now_prop = POWER_SUPPLY_PROP_CHARGE_NOW;
228 avg_prop = POWER_SUPPLY_PROP_CHARGE_AVG;
229 break;
230 case SOURCE_ENERGY:
231 full_prop = POWER_SUPPLY_PROP_ENERGY_FULL;
232 empty_prop = POWER_SUPPLY_PROP_ENERGY_EMPTY;
233 full_design_prop = POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN;
234 empty_design_prop = POWER_SUPPLY_PROP_ENERGY_EMPTY_DESIGN;
235 now_prop = POWER_SUPPLY_PROP_ENERGY_NOW;
236 avg_prop = POWER_SUPPLY_PROP_ENERGY_AVG;
237 break;
238 case SOURCE_VOLTAGE:
239 full_prop = POWER_SUPPLY_PROP_VOLTAGE_MAX;
240 empty_prop = POWER_SUPPLY_PROP_VOLTAGE_MIN;
241 full_design_prop = POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN;
242 empty_design_prop = POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN;
243 now_prop = POWER_SUPPLY_PROP_VOLTAGE_NOW;
244 avg_prop = POWER_SUPPLY_PROP_VOLTAGE_AVG;
245 break;
246 default:
247 printk(KERN_ERR "Unsupported source: %d\n", source);
248 return -1;
249 }
250
251 if (_MPSY_PROP(full_prop, &full)) {
252 /* if battery can't report this property, use design value */
253 if (_MPSY_PROP(full_design_prop, &full))
254 return -1;
255 }
256
257 if (_MPSY_PROP(avg_prop, &cur)) {
258 /* if battery can't report average value, use momentary */
259 if (_MPSY_PROP(now_prop, &cur))
260 return -1;
261 }
262
263 if (_MPSY_PROP(empty_prop, &empty)) {
264 /* if battery can't report this property, use design value */
265 if (_MPSY_PROP(empty_design_prop, &empty))
266 empty.intval = 0;
267 }
268
269 if (full.intval - empty.intval)
270 ret = ((cur.intval - empty.intval) * 100L) /
271 (full.intval - empty.intval);
272 else
273 return -1;
274
275 if (ret > 100)
276 return 100;
277 else if (ret < 0)
278 return 0;
279
280 return ret;
281 }
282
apm_battery_apm_get_power_status(struct apm_power_info * info)283 static void apm_battery_apm_get_power_status(struct apm_power_info *info)
284 {
285 union power_supply_propval status;
286 union power_supply_propval capacity, time_to_full, time_to_empty;
287
288 mutex_lock(&apm_mutex);
289 find_main_battery();
290 if (!main_battery) {
291 mutex_unlock(&apm_mutex);
292 return;
293 }
294
295 /* status */
296
297 if (MPSY_PROP(STATUS, &status))
298 status.intval = POWER_SUPPLY_STATUS_UNKNOWN;
299
300 /* ac line status */
301
302 if ((status.intval == POWER_SUPPLY_STATUS_CHARGING) ||
303 (status.intval == POWER_SUPPLY_STATUS_NOT_CHARGING) ||
304 (status.intval == POWER_SUPPLY_STATUS_FULL))
305 info->ac_line_status = APM_AC_ONLINE;
306 else
307 info->ac_line_status = APM_AC_OFFLINE;
308
309 /* battery life (i.e. capacity, in percents) */
310
311 if (MPSY_PROP(CAPACITY, &capacity) == 0) {
312 info->battery_life = capacity.intval;
313 } else {
314 /* try calculate using energy */
315 info->battery_life = calculate_capacity(SOURCE_ENERGY);
316 /* if failed try calculate using charge instead */
317 if (info->battery_life == -1)
318 info->battery_life = calculate_capacity(SOURCE_CHARGE);
319 if (info->battery_life == -1)
320 info->battery_life = calculate_capacity(SOURCE_VOLTAGE);
321 }
322
323 /* charging status */
324
325 if (status.intval == POWER_SUPPLY_STATUS_CHARGING) {
326 info->battery_status = APM_BATTERY_STATUS_CHARGING;
327 } else {
328 if (info->battery_life > 50)
329 info->battery_status = APM_BATTERY_STATUS_HIGH;
330 else if (info->battery_life > 5)
331 info->battery_status = APM_BATTERY_STATUS_LOW;
332 else
333 info->battery_status = APM_BATTERY_STATUS_CRITICAL;
334 }
335 info->battery_flag = info->battery_status;
336
337 /* time */
338
339 info->units = APM_UNITS_MINS;
340
341 if (status.intval == POWER_SUPPLY_STATUS_CHARGING) {
342 if (!MPSY_PROP(TIME_TO_FULL_AVG, &time_to_full) ||
343 !MPSY_PROP(TIME_TO_FULL_NOW, &time_to_full))
344 info->time = time_to_full.intval / 60;
345 else
346 info->time = calculate_time(status.intval);
347 } else {
348 if (!MPSY_PROP(TIME_TO_EMPTY_AVG, &time_to_empty) ||
349 !MPSY_PROP(TIME_TO_EMPTY_NOW, &time_to_empty))
350 info->time = time_to_empty.intval / 60;
351 else
352 info->time = calculate_time(status.intval);
353 }
354
355 mutex_unlock(&apm_mutex);
356 }
357
apm_battery_init(void)358 static int __init apm_battery_init(void)
359 {
360 printk(KERN_INFO "APM Battery Driver\n");
361
362 apm_get_power_status = apm_battery_apm_get_power_status;
363 return 0;
364 }
365
apm_battery_exit(void)366 static void __exit apm_battery_exit(void)
367 {
368 apm_get_power_status = NULL;
369 }
370
371 module_init(apm_battery_init);
372 module_exit(apm_battery_exit);
373
374 MODULE_AUTHOR("Eugeny Boger <eugenyboger@dgap.mipt.ru>");
375 MODULE_DESCRIPTION("APM emulation driver for battery monitoring class");
376 MODULE_LICENSE("GPL");
377
