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Anton Vorontsov3788ec92007-05-04 00:43:24 +04001/*
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>
Paul Gortmaker51990e82012-01-22 11:23:42 -050013#include <linux/device.h>
Anton Vorontsov3788ec92007-05-04 00:43:24 +040014#include <linux/power_supply.h>
15#include <linux/apm-emulation.h>
16
Dmitry Baryshkovdffd28a2008-01-13 02:39:16 +030017
Krzysztof Kozlowski75599d32015-03-12 08:44:08 +010018#define PSY_PROP(psy, prop, val) (power_supply_get_property(psy, \
Ken O'Brienc84cad32011-05-29 18:53:12 +010019 POWER_SUPPLY_PROP_##prop, val))
Anton Vorontsov3788ec92007-05-04 00:43:24 +040020
Krzysztof Kozlowski75599d32015-03-12 08:44:08 +010021#define _MPSY_PROP(prop, val) (power_supply_get_property(main_battery, \
Ken O'Brienc84cad32011-05-29 18:53:12 +010022 prop, val))
Anton Vorontsov3788ec92007-05-04 00:43:24 +040023
24#define MPSY_PROP(prop, val) _MPSY_PROP(POWER_SUPPLY_PROP_##prop, val)
25
Dmitry Baryshkovdffd28a2008-01-13 02:39:16 +030026static DEFINE_MUTEX(apm_mutex);
Anton Vorontsov3788ec92007-05-04 00:43:24 +040027static struct power_supply *main_battery;
28
Dmitry Baryshkovdffd28a2008-01-13 02:39:16 +030029enum apm_source {
30 SOURCE_ENERGY,
31 SOURCE_CHARGE,
32 SOURCE_VOLTAGE,
33};
34
Dave Young443cad92008-01-22 13:58:22 +080035struct 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;
Anton Vorontsov3788ec92007-05-04 00:43:24 +040040 union power_supply_propval full;
Dave Young443cad92008-01-22 13:58:22 +080041 int max_charge;
42 int max_energy;
43};
Anton Vorontsov3788ec92007-05-04 00:43:24 +040044
Dave Young443cad92008-01-22 13:58:22 +080045static int __find_main_battery(struct device *dev, void *data)
46{
47 struct find_bat_param *bp = (struct find_bat_param *)data;
Anton Vorontsovd3853762007-10-05 01:05:00 +040048
Dave Young443cad92008-01-22 13:58:22 +080049 bp->bat = dev_get_drvdata(dev);
Anton Vorontsovd3853762007-10-05 01:05:00 +040050
Krzysztof Kozlowski297d7162015-03-12 08:44:11 +010051 if (bp->bat->desc->use_for_apm) {
Dave Young443cad92008-01-22 13:58:22 +080052 /* nice, we explicitly asked to report this battery. */
53 bp->main = bp->bat;
54 return 1;
Anton Vorontsov3788ec92007-05-04 00:43:24 +040055 }
Anton Vorontsovd3853762007-10-05 01:05:00 +040056
Dave Young443cad92008-01-22 13:58:22 +080057 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
Greg Kroah-Hartman93562b52008-05-22 17:21:08 -040082 error = class_for_each_device(power_supply_class, NULL, &bp,
Dave Young443cad92008-01-22 13:58:22 +080083 __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)) {
Anton Vorontsovd3853762007-10-05 01:05:00 +040091 /* try guess battery with more capacity */
Dave Young443cad92008-01-22 13:58:22 +080092 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;
Anton Vorontsovd3853762007-10-05 01:05:00 +040096 else
Dave Young443cad92008-01-22 13:58:22 +080097 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;
Anton Vorontsovd3853762007-10-05 01:05:00 +0400102 else
Dave Young443cad92008-01-22 13:58:22 +0800103 main_battery = bp.max_energy_bat;
Anton Vorontsovd3853762007-10-05 01:05:00 +0400104 } else {
105 /* give up, choice any */
Dave Young443cad92008-01-22 13:58:22 +0800106 main_battery = bp.max_energy_bat;
Anton Vorontsovd3853762007-10-05 01:05:00 +0400107 }
Dave Young443cad92008-01-22 13:58:22 +0800108 } 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;
Anton Vorontsovd3853762007-10-05 01:05:00 +0400112 } else {
113 /* give up, try the last if any */
Dave Young443cad92008-01-22 13:58:22 +0800114 main_battery = bp.bat;
Anton Vorontsovd3853762007-10-05 01:05:00 +0400115 }
Anton Vorontsov3788ec92007-05-04 00:43:24 +0400116}
117
Dmitry Baryshkovdffd28a2008-01-13 02:39:16 +0300118static int do_calculate_time(int status, enum apm_source source)
Anton Vorontsov3788ec92007-05-04 00:43:24 +0400119{
Anton Vorontsov2a721df2007-10-05 01:05:00 +0400120 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;
Anton Vorontsov3788ec92007-05-04 00:43:24 +0400130
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
Anton Vorontsove91926e2008-01-13 02:44:54 +0300137 if (!I.intval)
138 return 0;
139
Dmitry Baryshkovdffd28a2008-01-13 02:39:16 +0300140 switch (source) {
141 case SOURCE_CHARGE:
Anton Vorontsov2a721df2007-10-05 01:05:00 +0400142 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;
Dmitry Baryshkovdffd28a2008-01-13 02:39:16 +0300148 break;
149 case SOURCE_ENERGY:
Anton Vorontsov2a721df2007-10-05 01:05:00 +0400150 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;
Dmitry Baryshkovdffd28a2008-01-13 02:39:16 +0300156 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;
Anton Vorontsov2a721df2007-10-05 01:05:00 +0400168 }
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
Anton Vorontsov3788ec92007-05-04 00:43:24 +0400188 if (status == POWER_SUPPLY_STATUS_CHARGING)
Anton Vorontsov2a721df2007-10-05 01:05:00 +0400189 return ((cur.intval - full.intval) * 60L) / I.intval;
Anton Vorontsov3788ec92007-05-04 00:43:24 +0400190 else
Anton Vorontsov2a721df2007-10-05 01:05:00 +0400191 return -((cur.intval - empty.intval) * 60L) / I.intval;
Anton Vorontsov3788ec92007-05-04 00:43:24 +0400192}
193
Dmitry Baryshkovdffd28a2008-01-13 02:39:16 +0300194static 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
213static int calculate_capacity(enum apm_source source)
Anton Vorontsov3788ec92007-05-04 00:43:24 +0400214{
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
Dmitry Baryshkovdffd28a2008-01-13 02:39:16 +0300221 switch (source) {
222 case SOURCE_CHARGE:
Anton Vorontsov3788ec92007-05-04 00:43:24 +0400223 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;
Dmitry Baryshkovdffd28a2008-01-13 02:39:16 +0300229 break;
230 case SOURCE_ENERGY:
Anton Vorontsov3788ec92007-05-04 00:43:24 +0400231 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;
Anton Vorontsov1d220332010-09-08 00:10:26 +0400237 break;
Dmitry Baryshkovdffd28a2008-01-13 02:39:16 +0300238 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;
Anton Vorontsov3788ec92007-05-04 00:43:24 +0400249 }
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
283static 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
Dave Young443cad92008-01-22 13:58:22 +0800288 mutex_lock(&apm_mutex);
Anton Vorontsov3788ec92007-05-04 00:43:24 +0400289 find_main_battery();
290 if (!main_battery) {
Dave Young443cad92008-01-22 13:58:22 +0800291 mutex_unlock(&apm_mutex);
Anton Vorontsov3788ec92007-05-04 00:43:24 +0400292 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 */
Dmitry Baryshkovdffd28a2008-01-13 02:39:16 +0300315 info->battery_life = calculate_capacity(SOURCE_ENERGY);
Anton Vorontsov3788ec92007-05-04 00:43:24 +0400316 /* if failed try calculate using charge instead */
317 if (info->battery_life == -1)
Dmitry Baryshkovdffd28a2008-01-13 02:39:16 +0300318 info->battery_life = calculate_capacity(SOURCE_CHARGE);
319 if (info->battery_life == -1)
320 info->battery_life = calculate_capacity(SOURCE_VOLTAGE);
Anton Vorontsov3788ec92007-05-04 00:43:24 +0400321 }
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) {
Anton Vorontsovcd1ebcc2007-10-05 01:04:59 +0400342 if (!MPSY_PROP(TIME_TO_FULL_AVG, &time_to_full) ||
Dmitry Baryshkovdffd28a2008-01-13 02:39:16 +0300343 !MPSY_PROP(TIME_TO_FULL_NOW, &time_to_full))
Anton Vorontsovcd1ebcc2007-10-05 01:04:59 +0400344 info->time = time_to_full.intval / 60;
Dmitry Baryshkovdffd28a2008-01-13 02:39:16 +0300345 else
346 info->time = calculate_time(status.intval);
Anton Vorontsov3788ec92007-05-04 00:43:24 +0400347 } else {
Anton Vorontsovcd1ebcc2007-10-05 01:04:59 +0400348 if (!MPSY_PROP(TIME_TO_EMPTY_AVG, &time_to_empty) ||
Dmitry Baryshkovdffd28a2008-01-13 02:39:16 +0300349 !MPSY_PROP(TIME_TO_EMPTY_NOW, &time_to_empty))
Anton Vorontsovcd1ebcc2007-10-05 01:04:59 +0400350 info->time = time_to_empty.intval / 60;
Dmitry Baryshkovdffd28a2008-01-13 02:39:16 +0300351 else
352 info->time = calculate_time(status.intval);
Anton Vorontsov3788ec92007-05-04 00:43:24 +0400353 }
354
Dave Young443cad92008-01-22 13:58:22 +0800355 mutex_unlock(&apm_mutex);
Anton Vorontsov3788ec92007-05-04 00:43:24 +0400356}
357
358static 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
366static void __exit apm_battery_exit(void)
367{
368 apm_get_power_status = NULL;
Anton Vorontsov3788ec92007-05-04 00:43:24 +0400369}
370
371module_init(apm_battery_init);
372module_exit(apm_battery_exit);
373
374MODULE_AUTHOR("Eugeny Boger <eugenyboger@dgap.mipt.ru>");
375MODULE_DESCRIPTION("APM emulation driver for battery monitoring class");
376MODULE_LICENSE("GPL");