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
26static DEFINE_MUTEX(apm_mutex);
27static struct power_supply *main_battery;
28
29enum apm_source {
30 SOURCE_ENERGY,
31 SOURCE_CHARGE,
32 SOURCE_VOLTAGE,
33};
34
35struct 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
45static 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
73static 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 = power_supply_for_each_device(data: &bp, fn: __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
117static 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
193static int calculate_time(int status)
194{
195 int time;
196
197 time = do_calculate_time(status, source: SOURCE_ENERGY);
198 if (time != -1)
199 return time;
200
201 time = do_calculate_time(status, source: SOURCE_CHARGE);
202 if (time != -1)
203 return time;
204
205 time = do_calculate_time(status, source: SOURCE_VOLTAGE);
206 if (time != -1)
207 return time;
208
209 return -1;
210}
211
212static 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 break;
237 case SOURCE_VOLTAGE:
238 full_prop = POWER_SUPPLY_PROP_VOLTAGE_MAX;
239 empty_prop = POWER_SUPPLY_PROP_VOLTAGE_MIN;
240 full_design_prop = POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN;
241 empty_design_prop = POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN;
242 now_prop = POWER_SUPPLY_PROP_VOLTAGE_NOW;
243 avg_prop = POWER_SUPPLY_PROP_VOLTAGE_AVG;
244 break;
245 default:
246 printk(KERN_ERR "Unsupported source: %d\n", source);
247 return -1;
248 }
249
250 if (_MPSY_PROP(full_prop, &full)) {
251 /* if battery can't report this property, use design value */
252 if (_MPSY_PROP(full_design_prop, &full))
253 return -1;
254 }
255
256 if (_MPSY_PROP(avg_prop, &cur)) {
257 /* if battery can't report average value, use momentary */
258 if (_MPSY_PROP(now_prop, &cur))
259 return -1;
260 }
261
262 if (_MPSY_PROP(empty_prop, &empty)) {
263 /* if battery can't report this property, use design value */
264 if (_MPSY_PROP(empty_design_prop, &empty))
265 empty.intval = 0;
266 }
267
268 if (full.intval - empty.intval)
269 ret = ((cur.intval - empty.intval) * 100L) /
270 (full.intval - empty.intval);
271 else
272 return -1;
273
274 if (ret > 100)
275 return 100;
276 else if (ret < 0)
277 return 0;
278
279 return ret;
280}
281
282static void apm_battery_apm_get_power_status(struct apm_power_info *info)
283{
284 union power_supply_propval status;
285 union power_supply_propval capacity, time_to_full, time_to_empty;
286
287 mutex_lock(&apm_mutex);
288 find_main_battery();
289 if (!main_battery) {
290 mutex_unlock(lock: &apm_mutex);
291 return;
292 }
293
294 /* status */
295
296 if (MPSY_PROP(STATUS, &status))
297 status.intval = POWER_SUPPLY_STATUS_UNKNOWN;
298
299 /* ac line status */
300
301 if ((status.intval == POWER_SUPPLY_STATUS_CHARGING) ||
302 (status.intval == POWER_SUPPLY_STATUS_NOT_CHARGING) ||
303 (status.intval == POWER_SUPPLY_STATUS_FULL))
304 info->ac_line_status = APM_AC_ONLINE;
305 else
306 info->ac_line_status = APM_AC_OFFLINE;
307
308 /* battery life (i.e. capacity, in percents) */
309
310 if (MPSY_PROP(CAPACITY, &capacity) == 0) {
311 info->battery_life = capacity.intval;
312 } else {
313 /* try calculate using energy */
314 info->battery_life = calculate_capacity(source: SOURCE_ENERGY);
315 /* if failed try calculate using charge instead */
316 if (info->battery_life == -1)
317 info->battery_life = calculate_capacity(source: SOURCE_CHARGE);
318 if (info->battery_life == -1)
319 info->battery_life = calculate_capacity(source: SOURCE_VOLTAGE);
320 }
321
322 /* charging status */
323
324 if (status.intval == POWER_SUPPLY_STATUS_CHARGING) {
325 info->battery_status = APM_BATTERY_STATUS_CHARGING;
326 } else {
327 if (info->battery_life > 50)
328 info->battery_status = APM_BATTERY_STATUS_HIGH;
329 else if (info->battery_life > 5)
330 info->battery_status = APM_BATTERY_STATUS_LOW;
331 else
332 info->battery_status = APM_BATTERY_STATUS_CRITICAL;
333 }
334 info->battery_flag = info->battery_status;
335
336 /* time */
337
338 info->units = APM_UNITS_MINS;
339
340 if (status.intval == POWER_SUPPLY_STATUS_CHARGING) {
341 if (!MPSY_PROP(TIME_TO_FULL_AVG, &time_to_full) ||
342 !MPSY_PROP(TIME_TO_FULL_NOW, &time_to_full))
343 info->time = time_to_full.intval / 60;
344 else
345 info->time = calculate_time(status: status.intval);
346 } else {
347 if (!MPSY_PROP(TIME_TO_EMPTY_AVG, &time_to_empty) ||
348 !MPSY_PROP(TIME_TO_EMPTY_NOW, &time_to_empty))
349 info->time = time_to_empty.intval / 60;
350 else
351 info->time = calculate_time(status: status.intval);
352 }
353
354 mutex_unlock(lock: &apm_mutex);
355}
356
357static int __init apm_battery_init(void)
358{
359 printk(KERN_INFO "APM Battery Driver\n");
360
361 apm_get_power_status = apm_battery_apm_get_power_status;
362 return 0;
363}
364
365static void __exit apm_battery_exit(void)
366{
367 apm_get_power_status = NULL;
368}
369
370module_init(apm_battery_init);
371module_exit(apm_battery_exit);
372
373MODULE_AUTHOR("Eugeny Boger <eugenyboger@dgap.mipt.ru>");
374MODULE_DESCRIPTION("APM emulation driver for battery monitoring class");
375MODULE_LICENSE("GPL");
376

source code of linux/drivers/power/supply/apm_power.c