2 * Copyright © 2007 Anton Vorontsov <cbou@mail.ru>
3 * Copyright © 2007 Eugeny Boger <eugenyboger@dgap.mipt.ru>
5 * Author: Eugeny Boger <eugenyboger@dgap.mipt.ru>
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.
12 #include <linux/module.h>
13 #include <linux/power_supply.h>
14 #include <linux/apm-emulation.h>
17 #define PSY_PROP(psy, prop, val) psy->get_property(psy, \
18 POWER_SUPPLY_PROP_##prop, val)
20 #define _MPSY_PROP(prop, val) main_battery->get_property(main_battery, \
23 #define MPSY_PROP(prop, val) _MPSY_PROP(POWER_SUPPLY_PROP_##prop, val)
25 static DEFINE_MUTEX(apm_mutex);
26 static struct power_supply *main_battery;
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;
44 static int __find_main_battery(struct device *dev, void *data)
46 struct find_bat_param *bp = (struct find_bat_param *)data;
48 bp->bat = dev_get_drvdata(dev);
50 if (bp->bat->use_for_apm) {
51 /* nice, we explicitly asked to report this battery. */
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;
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;
72 static void find_main_battery(void)
74 struct find_bat_param bp;
77 memset(&bp, 0, sizeof(struct find_bat_param));
79 bp.main = main_battery;
81 error = class_for_each_device(power_supply_class, &bp,
84 main_battery = bp.main;
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,
93 if (bp.max_energy > bp.max_charge * bp.full.intval)
94 main_battery = bp.max_energy_bat;
96 main_battery = bp.max_charge_bat;
97 } else if (!PSY_PROP(bp.max_energy_bat, VOLTAGE_MAX_DESIGN,
99 if (bp.max_charge > bp.max_energy / bp.full.intval)
100 main_battery = bp.max_charge_bat;
102 main_battery = bp.max_energy_bat;
104 /* give up, choice any */
105 main_battery = bp.max_energy_bat;
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;
112 /* give up, try the last if any */
113 main_battery = bp.bat;
117 static int do_calculate_time(int status, enum apm_source source)
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;
130 if (MPSY_PROP(CURRENT_AVG, &I)) {
131 /* if battery can't report average value, use momentary */
132 if (MPSY_PROP(CURRENT_NOW, &I))
138 full_prop = POWER_SUPPLY_PROP_CHARGE_FULL;
139 full_design_prop = POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN;
140 empty_prop = POWER_SUPPLY_PROP_CHARGE_EMPTY;
141 empty_design_prop = POWER_SUPPLY_PROP_CHARGE_EMPTY;
142 cur_avg_prop = POWER_SUPPLY_PROP_CHARGE_AVG;
143 cur_now_prop = POWER_SUPPLY_PROP_CHARGE_NOW;
146 full_prop = POWER_SUPPLY_PROP_ENERGY_FULL;
147 full_design_prop = POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN;
148 empty_prop = POWER_SUPPLY_PROP_ENERGY_EMPTY;
149 empty_design_prop = POWER_SUPPLY_PROP_CHARGE_EMPTY;
150 cur_avg_prop = POWER_SUPPLY_PROP_ENERGY_AVG;
151 cur_now_prop = POWER_SUPPLY_PROP_ENERGY_NOW;
154 full_prop = POWER_SUPPLY_PROP_VOLTAGE_MAX;
155 full_design_prop = POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN;
156 empty_prop = POWER_SUPPLY_PROP_VOLTAGE_MIN;
157 empty_design_prop = POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN;
158 cur_avg_prop = POWER_SUPPLY_PROP_VOLTAGE_AVG;
159 cur_now_prop = POWER_SUPPLY_PROP_VOLTAGE_NOW;
162 printk(KERN_ERR "Unsupported source: %d\n", source);
166 if (_MPSY_PROP(full_prop, &full)) {
167 /* if battery can't report this property, use design value */
168 if (_MPSY_PROP(full_design_prop, &full))
172 if (_MPSY_PROP(empty_prop, &empty)) {
173 /* if battery can't report this property, use design value */
174 if (_MPSY_PROP(empty_design_prop, &empty))
178 if (_MPSY_PROP(cur_avg_prop, &cur)) {
179 /* if battery can't report average value, use momentary */
180 if (_MPSY_PROP(cur_now_prop, &cur))
184 if (status == POWER_SUPPLY_STATUS_CHARGING)
185 return ((cur.intval - full.intval) * 60L) / I.intval;
187 return -((cur.intval - empty.intval) * 60L) / I.intval;
190 static int calculate_time(int status)
194 time = do_calculate_time(status, SOURCE_ENERGY);
198 time = do_calculate_time(status, SOURCE_CHARGE);
202 time = do_calculate_time(status, SOURCE_VOLTAGE);
209 static int calculate_capacity(enum apm_source source)
211 enum power_supply_property full_prop, empty_prop;
212 enum power_supply_property full_design_prop, empty_design_prop;
213 enum power_supply_property now_prop, avg_prop;
214 union power_supply_propval empty, full, cur;
219 full_prop = POWER_SUPPLY_PROP_CHARGE_FULL;
220 empty_prop = POWER_SUPPLY_PROP_CHARGE_EMPTY;
221 full_design_prop = POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN;
222 empty_design_prop = POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN;
223 now_prop = POWER_SUPPLY_PROP_CHARGE_NOW;
224 avg_prop = POWER_SUPPLY_PROP_CHARGE_AVG;
227 full_prop = POWER_SUPPLY_PROP_ENERGY_FULL;
228 empty_prop = POWER_SUPPLY_PROP_ENERGY_EMPTY;
229 full_design_prop = POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN;
230 empty_design_prop = POWER_SUPPLY_PROP_ENERGY_EMPTY_DESIGN;
231 now_prop = POWER_SUPPLY_PROP_ENERGY_NOW;
232 avg_prop = POWER_SUPPLY_PROP_ENERGY_AVG;
234 full_prop = POWER_SUPPLY_PROP_VOLTAGE_MAX;
235 empty_prop = POWER_SUPPLY_PROP_VOLTAGE_MIN;
236 full_design_prop = POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN;
237 empty_design_prop = POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN;
238 now_prop = POWER_SUPPLY_PROP_VOLTAGE_NOW;
239 avg_prop = POWER_SUPPLY_PROP_VOLTAGE_AVG;
242 printk(KERN_ERR "Unsupported source: %d\n", source);
246 if (_MPSY_PROP(full_prop, &full)) {
247 /* if battery can't report this property, use design value */
248 if (_MPSY_PROP(full_design_prop, &full))
252 if (_MPSY_PROP(avg_prop, &cur)) {
253 /* if battery can't report average value, use momentary */
254 if (_MPSY_PROP(now_prop, &cur))
258 if (_MPSY_PROP(empty_prop, &empty)) {
259 /* if battery can't report this property, use design value */
260 if (_MPSY_PROP(empty_design_prop, &empty))
264 if (full.intval - empty.intval)
265 ret = ((cur.intval - empty.intval) * 100L) /
266 (full.intval - empty.intval);
278 static void apm_battery_apm_get_power_status(struct apm_power_info *info)
280 union power_supply_propval status;
281 union power_supply_propval capacity, time_to_full, time_to_empty;
283 mutex_lock(&apm_mutex);
286 mutex_unlock(&apm_mutex);
292 if (MPSY_PROP(STATUS, &status))
293 status.intval = POWER_SUPPLY_STATUS_UNKNOWN;
297 if ((status.intval == POWER_SUPPLY_STATUS_CHARGING) ||
298 (status.intval == POWER_SUPPLY_STATUS_NOT_CHARGING) ||
299 (status.intval == POWER_SUPPLY_STATUS_FULL))
300 info->ac_line_status = APM_AC_ONLINE;
302 info->ac_line_status = APM_AC_OFFLINE;
304 /* battery life (i.e. capacity, in percents) */
306 if (MPSY_PROP(CAPACITY, &capacity) == 0) {
307 info->battery_life = capacity.intval;
309 /* try calculate using energy */
310 info->battery_life = calculate_capacity(SOURCE_ENERGY);
311 /* if failed try calculate using charge instead */
312 if (info->battery_life == -1)
313 info->battery_life = calculate_capacity(SOURCE_CHARGE);
314 if (info->battery_life == -1)
315 info->battery_life = calculate_capacity(SOURCE_VOLTAGE);
318 /* charging status */
320 if (status.intval == POWER_SUPPLY_STATUS_CHARGING) {
321 info->battery_status = APM_BATTERY_STATUS_CHARGING;
323 if (info->battery_life > 50)
324 info->battery_status = APM_BATTERY_STATUS_HIGH;
325 else if (info->battery_life > 5)
326 info->battery_status = APM_BATTERY_STATUS_LOW;
328 info->battery_status = APM_BATTERY_STATUS_CRITICAL;
330 info->battery_flag = info->battery_status;
334 info->units = APM_UNITS_MINS;
336 if (status.intval == POWER_SUPPLY_STATUS_CHARGING) {
337 if (!MPSY_PROP(TIME_TO_FULL_AVG, &time_to_full) ||
338 !MPSY_PROP(TIME_TO_FULL_NOW, &time_to_full))
339 info->time = time_to_full.intval / 60;
341 info->time = calculate_time(status.intval);
343 if (!MPSY_PROP(TIME_TO_EMPTY_AVG, &time_to_empty) ||
344 !MPSY_PROP(TIME_TO_EMPTY_NOW, &time_to_empty))
345 info->time = time_to_empty.intval / 60;
347 info->time = calculate_time(status.intval);
350 mutex_unlock(&apm_mutex);
353 static int __init apm_battery_init(void)
355 printk(KERN_INFO "APM Battery Driver\n");
357 apm_get_power_status = apm_battery_apm_get_power_status;
361 static void __exit apm_battery_exit(void)
363 apm_get_power_status = NULL;
366 module_init(apm_battery_init);
367 module_exit(apm_battery_exit);
369 MODULE_AUTHOR("Eugeny Boger <eugenyboger@dgap.mipt.ru>");
370 MODULE_DESCRIPTION("APM emulation driver for battery monitoring class");
371 MODULE_LICENSE("GPL");