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3788ec93 AV |
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 | #define PSY_PROP(psy, prop, val) psy->get_property(psy, \ | |
17 | POWER_SUPPLY_PROP_##prop, val) | |
18 | ||
19 | #define _MPSY_PROP(prop, val) main_battery->get_property(main_battery, \ | |
20 | prop, val) | |
21 | ||
22 | #define MPSY_PROP(prop, val) _MPSY_PROP(POWER_SUPPLY_PROP_##prop, val) | |
23 | ||
24 | static struct power_supply *main_battery; | |
25 | ||
26 | static void find_main_battery(void) | |
27 | { | |
28 | struct device *dev; | |
29 | struct power_supply *bat, *batm; | |
30 | union power_supply_propval full; | |
31 | int max_charge = 0; | |
32 | ||
33 | main_battery = NULL; | |
34 | batm = NULL; | |
35 | list_for_each_entry(dev, &power_supply_class->devices, node) { | |
36 | bat = dev_get_drvdata(dev); | |
37 | /* If none of battery devices cantains 'use_for_apm' flag, | |
38 | choice one with maximum design charge */ | |
39 | if (!PSY_PROP(bat, CHARGE_FULL_DESIGN, &full)) { | |
40 | if (full.intval > max_charge) { | |
41 | batm = bat; | |
42 | max_charge = full.intval; | |
43 | } | |
44 | } | |
45 | ||
46 | if (bat->use_for_apm) | |
47 | main_battery = bat; | |
48 | } | |
49 | if (!main_battery) | |
50 | main_battery = batm; | |
51 | ||
52 | return; | |
53 | } | |
54 | ||
55 | static int calculate_time(int status) | |
56 | { | |
57 | union power_supply_propval charge_full, charge_empty; | |
58 | union power_supply_propval charge, I; | |
59 | ||
60 | if (MPSY_PROP(CHARGE_FULL, &charge_full)) { | |
61 | /* if battery can't report this property, use design value */ | |
62 | if (MPSY_PROP(CHARGE_FULL_DESIGN, &charge_full)) | |
63 | return -1; | |
64 | } | |
65 | ||
66 | if (MPSY_PROP(CHARGE_EMPTY, &charge_empty)) { | |
67 | /* if battery can't report this property, use design value */ | |
68 | if (MPSY_PROP(CHARGE_EMPTY_DESIGN, &charge_empty)) | |
69 | charge_empty.intval = 0; | |
70 | } | |
71 | ||
72 | if (MPSY_PROP(CHARGE_AVG, &charge)) { | |
73 | /* if battery can't report average value, use momentary */ | |
74 | if (MPSY_PROP(CHARGE_NOW, &charge)) | |
75 | return -1; | |
76 | } | |
77 | ||
78 | if (MPSY_PROP(CURRENT_AVG, &I)) { | |
79 | /* if battery can't report average value, use momentary */ | |
80 | if (MPSY_PROP(CURRENT_NOW, &I)) | |
81 | return -1; | |
82 | } | |
83 | ||
84 | if (status == POWER_SUPPLY_STATUS_CHARGING) | |
85 | return ((charge.intval - charge_full.intval) * 60L) / | |
86 | I.intval; | |
87 | else | |
88 | return -((charge.intval - charge_empty.intval) * 60L) / | |
89 | I.intval; | |
90 | } | |
91 | ||
92 | static int calculate_capacity(int using_charge) | |
93 | { | |
94 | enum power_supply_property full_prop, empty_prop; | |
95 | enum power_supply_property full_design_prop, empty_design_prop; | |
96 | enum power_supply_property now_prop, avg_prop; | |
97 | union power_supply_propval empty, full, cur; | |
98 | int ret; | |
99 | ||
100 | if (using_charge) { | |
101 | full_prop = POWER_SUPPLY_PROP_CHARGE_FULL; | |
102 | empty_prop = POWER_SUPPLY_PROP_CHARGE_EMPTY; | |
103 | full_design_prop = POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN; | |
104 | empty_design_prop = POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN; | |
105 | now_prop = POWER_SUPPLY_PROP_CHARGE_NOW; | |
106 | avg_prop = POWER_SUPPLY_PROP_CHARGE_AVG; | |
107 | } else { | |
108 | full_prop = POWER_SUPPLY_PROP_ENERGY_FULL; | |
109 | empty_prop = POWER_SUPPLY_PROP_ENERGY_EMPTY; | |
110 | full_design_prop = POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN; | |
111 | empty_design_prop = POWER_SUPPLY_PROP_ENERGY_EMPTY_DESIGN; | |
112 | now_prop = POWER_SUPPLY_PROP_ENERGY_NOW; | |
113 | avg_prop = POWER_SUPPLY_PROP_ENERGY_AVG; | |
114 | } | |
115 | ||
116 | if (_MPSY_PROP(full_prop, &full)) { | |
117 | /* if battery can't report this property, use design value */ | |
118 | if (_MPSY_PROP(full_design_prop, &full)) | |
119 | return -1; | |
120 | } | |
121 | ||
122 | if (_MPSY_PROP(avg_prop, &cur)) { | |
123 | /* if battery can't report average value, use momentary */ | |
124 | if (_MPSY_PROP(now_prop, &cur)) | |
125 | return -1; | |
126 | } | |
127 | ||
128 | if (_MPSY_PROP(empty_prop, &empty)) { | |
129 | /* if battery can't report this property, use design value */ | |
130 | if (_MPSY_PROP(empty_design_prop, &empty)) | |
131 | empty.intval = 0; | |
132 | } | |
133 | ||
134 | if (full.intval - empty.intval) | |
135 | ret = ((cur.intval - empty.intval) * 100L) / | |
136 | (full.intval - empty.intval); | |
137 | else | |
138 | return -1; | |
139 | ||
140 | if (ret > 100) | |
141 | return 100; | |
142 | else if (ret < 0) | |
143 | return 0; | |
144 | ||
145 | return ret; | |
146 | } | |
147 | ||
148 | static void apm_battery_apm_get_power_status(struct apm_power_info *info) | |
149 | { | |
150 | union power_supply_propval status; | |
151 | union power_supply_propval capacity, time_to_full, time_to_empty; | |
152 | ||
153 | down(&power_supply_class->sem); | |
154 | find_main_battery(); | |
155 | if (!main_battery) { | |
156 | up(&power_supply_class->sem); | |
157 | return; | |
158 | } | |
159 | ||
160 | /* status */ | |
161 | ||
162 | if (MPSY_PROP(STATUS, &status)) | |
163 | status.intval = POWER_SUPPLY_STATUS_UNKNOWN; | |
164 | ||
165 | /* ac line status */ | |
166 | ||
167 | if ((status.intval == POWER_SUPPLY_STATUS_CHARGING) || | |
168 | (status.intval == POWER_SUPPLY_STATUS_NOT_CHARGING) || | |
169 | (status.intval == POWER_SUPPLY_STATUS_FULL)) | |
170 | info->ac_line_status = APM_AC_ONLINE; | |
171 | else | |
172 | info->ac_line_status = APM_AC_OFFLINE; | |
173 | ||
174 | /* battery life (i.e. capacity, in percents) */ | |
175 | ||
176 | if (MPSY_PROP(CAPACITY, &capacity) == 0) { | |
177 | info->battery_life = capacity.intval; | |
178 | } else { | |
179 | /* try calculate using energy */ | |
180 | info->battery_life = calculate_capacity(0); | |
181 | /* if failed try calculate using charge instead */ | |
182 | if (info->battery_life == -1) | |
183 | info->battery_life = calculate_capacity(1); | |
184 | } | |
185 | ||
186 | /* charging status */ | |
187 | ||
188 | if (status.intval == POWER_SUPPLY_STATUS_CHARGING) { | |
189 | info->battery_status = APM_BATTERY_STATUS_CHARGING; | |
190 | } else { | |
191 | if (info->battery_life > 50) | |
192 | info->battery_status = APM_BATTERY_STATUS_HIGH; | |
193 | else if (info->battery_life > 5) | |
194 | info->battery_status = APM_BATTERY_STATUS_LOW; | |
195 | else | |
196 | info->battery_status = APM_BATTERY_STATUS_CRITICAL; | |
197 | } | |
198 | info->battery_flag = info->battery_status; | |
199 | ||
200 | /* time */ | |
201 | ||
202 | info->units = APM_UNITS_MINS; | |
203 | ||
204 | if (status.intval == POWER_SUPPLY_STATUS_CHARGING) { | |
205 | if (MPSY_PROP(TIME_TO_FULL_AVG, &time_to_full)) { | |
206 | if (MPSY_PROP(TIME_TO_FULL_NOW, &time_to_full)) | |
207 | info->time = calculate_time(status.intval); | |
208 | else | |
209 | info->time = time_to_full.intval / 60; | |
210 | } | |
211 | } else { | |
212 | if (MPSY_PROP(TIME_TO_EMPTY_AVG, &time_to_empty)) { | |
213 | if (MPSY_PROP(TIME_TO_EMPTY_NOW, &time_to_empty)) | |
214 | info->time = calculate_time(status.intval); | |
215 | else | |
216 | info->time = time_to_empty.intval / 60; | |
217 | } | |
218 | } | |
219 | ||
220 | up(&power_supply_class->sem); | |
221 | return; | |
222 | } | |
223 | ||
224 | static int __init apm_battery_init(void) | |
225 | { | |
226 | printk(KERN_INFO "APM Battery Driver\n"); | |
227 | ||
228 | apm_get_power_status = apm_battery_apm_get_power_status; | |
229 | return 0; | |
230 | } | |
231 | ||
232 | static void __exit apm_battery_exit(void) | |
233 | { | |
234 | apm_get_power_status = NULL; | |
235 | return; | |
236 | } | |
237 | ||
238 | module_init(apm_battery_init); | |
239 | module_exit(apm_battery_exit); | |
240 | ||
241 | MODULE_AUTHOR("Eugeny Boger <eugenyboger@dgap.mipt.ru>"); | |
242 | MODULE_DESCRIPTION("APM emulation driver for battery monitoring class"); | |
243 | MODULE_LICENSE("GPL"); |