1 /*
2 * Battery class driver for Apple PMU
3 *
4 * Copyright © 2006 David Woodhouse <dwmw2@infradead.org>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10
11 #include <linux/module.h>
12 #include <linux/platform_device.h>
13 #include <linux/err.h>
14 #include <linux/power_supply.h>
15 #include <linux/adb.h>
16 #include <linux/pmu.h>
17 #include <linux/slab.h>
18
19 static struct pmu_battery_dev {
20 struct power_supply bat;
21 struct pmu_battery_info *pbi;
22 char name[16];
23 int propval;
24 } *pbats[PMU_MAX_BATTERIES];
25
26 #define to_pmu_battery_dev(x) container_of(x, struct pmu_battery_dev, bat)
27
28 /*********************************************************************
29 * Power
30 *********************************************************************/
31
pmu_get_ac_prop(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)32 static int pmu_get_ac_prop(struct power_supply *psy,
33 enum power_supply_property psp,
34 union power_supply_propval *val)
35 {
36 switch (psp) {
37 case POWER_SUPPLY_PROP_ONLINE:
38 val->intval = (!!(pmu_power_flags & PMU_PWR_AC_PRESENT)) ||
39 (pmu_battery_count == 0);
40 break;
41 default:
42 return -EINVAL;
43 }
44
45 return 0;
46 }
47
48 static enum power_supply_property pmu_ac_props[] = {
49 POWER_SUPPLY_PROP_ONLINE,
50 };
51
52 static struct power_supply pmu_ac = {
53 .name = "pmu-ac",
54 .type = POWER_SUPPLY_TYPE_MAINS,
55 .properties = pmu_ac_props,
56 .num_properties = ARRAY_SIZE(pmu_ac_props),
57 .get_property = pmu_get_ac_prop,
58 };
59
60 /*********************************************************************
61 * Battery properties
62 *********************************************************************/
63
64 static char *pmu_batt_types[] = {
65 "Smart", "Comet", "Hooper", "Unknown"
66 };
67
pmu_bat_get_model_name(struct pmu_battery_info * pbi)68 static char *pmu_bat_get_model_name(struct pmu_battery_info *pbi)
69 {
70 switch (pbi->flags & PMU_BATT_TYPE_MASK) {
71 case PMU_BATT_TYPE_SMART:
72 return pmu_batt_types[0];
73 case PMU_BATT_TYPE_COMET:
74 return pmu_batt_types[1];
75 case PMU_BATT_TYPE_HOOPER:
76 return pmu_batt_types[2];
77 default: break;
78 }
79 return pmu_batt_types[3];
80 }
81
pmu_bat_get_property(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)82 static int pmu_bat_get_property(struct power_supply *psy,
83 enum power_supply_property psp,
84 union power_supply_propval *val)
85 {
86 struct pmu_battery_dev *pbat = to_pmu_battery_dev(psy);
87 struct pmu_battery_info *pbi = pbat->pbi;
88
89 switch (psp) {
90 case POWER_SUPPLY_PROP_STATUS:
91 if (pbi->flags & PMU_BATT_CHARGING)
92 val->intval = POWER_SUPPLY_STATUS_CHARGING;
93 else if (pmu_power_flags & PMU_PWR_AC_PRESENT)
94 val->intval = POWER_SUPPLY_STATUS_FULL;
95 else
96 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
97 break;
98 case POWER_SUPPLY_PROP_PRESENT:
99 val->intval = !!(pbi->flags & PMU_BATT_PRESENT);
100 break;
101 case POWER_SUPPLY_PROP_MODEL_NAME:
102 val->strval = pmu_bat_get_model_name(pbi);
103 break;
104 case POWER_SUPPLY_PROP_ENERGY_AVG:
105 val->intval = pbi->charge * 1000; /* mWh -> µWh */
106 break;
107 case POWER_SUPPLY_PROP_ENERGY_FULL:
108 val->intval = pbi->max_charge * 1000; /* mWh -> µWh */
109 break;
110 case POWER_SUPPLY_PROP_CURRENT_AVG:
111 val->intval = pbi->amperage * 1000; /* mA -> µA */
112 break;
113 case POWER_SUPPLY_PROP_VOLTAGE_AVG:
114 val->intval = pbi->voltage * 1000; /* mV -> µV */
115 break;
116 case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
117 val->intval = pbi->time_remaining;
118 break;
119 default:
120 return -EINVAL;
121 }
122
123 return 0;
124 }
125
126 static enum power_supply_property pmu_bat_props[] = {
127 POWER_SUPPLY_PROP_STATUS,
128 POWER_SUPPLY_PROP_PRESENT,
129 POWER_SUPPLY_PROP_MODEL_NAME,
130 POWER_SUPPLY_PROP_ENERGY_AVG,
131 POWER_SUPPLY_PROP_ENERGY_FULL,
132 POWER_SUPPLY_PROP_CURRENT_AVG,
133 POWER_SUPPLY_PROP_VOLTAGE_AVG,
134 POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
135 };
136
137 /*********************************************************************
138 * Initialisation
139 *********************************************************************/
140
141 static struct platform_device *bat_pdev;
142
pmu_bat_init(void)143 static int __init pmu_bat_init(void)
144 {
145 int ret;
146 int i;
147
148 bat_pdev = platform_device_register_simple("pmu-battery",
149 0, NULL, 0);
150 if (IS_ERR(bat_pdev)) {
151 ret = PTR_ERR(bat_pdev);
152 goto pdev_register_failed;
153 }
154
155 ret = power_supply_register(&bat_pdev->dev, &pmu_ac);
156 if (ret)
157 goto ac_register_failed;
158
159 for (i = 0; i < pmu_battery_count; i++) {
160 struct pmu_battery_dev *pbat = kzalloc(sizeof(*pbat),
161 GFP_KERNEL);
162 if (!pbat)
163 break;
164
165 sprintf(pbat->name, "PMU_battery_%d", i);
166 pbat->bat.name = pbat->name;
167 pbat->bat.properties = pmu_bat_props;
168 pbat->bat.num_properties = ARRAY_SIZE(pmu_bat_props);
169 pbat->bat.get_property = pmu_bat_get_property;
170 pbat->pbi = &pmu_batteries[i];
171
172 ret = power_supply_register(&bat_pdev->dev, &pbat->bat);
173 if (ret) {
174 kfree(pbat);
175 goto battery_register_failed;
176 }
177 pbats[i] = pbat;
178 }
179
180 goto success;
181
182 battery_register_failed:
183 while (i--) {
184 if (!pbats[i])
185 continue;
186 power_supply_unregister(&pbats[i]->bat);
187 kfree(pbats[i]);
188 }
189 power_supply_unregister(&pmu_ac);
190 ac_register_failed:
191 platform_device_unregister(bat_pdev);
192 pdev_register_failed:
193 success:
194 return ret;
195 }
196
pmu_bat_exit(void)197 static void __exit pmu_bat_exit(void)
198 {
199 int i;
200
201 for (i = 0; i < PMU_MAX_BATTERIES; i++) {
202 if (!pbats[i])
203 continue;
204 power_supply_unregister(&pbats[i]->bat);
205 kfree(pbats[i]);
206 }
207 power_supply_unregister(&pmu_ac);
208 platform_device_unregister(bat_pdev);
209 }
210
211 module_init(pmu_bat_init);
212 module_exit(pmu_bat_exit);
213
214 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
215 MODULE_LICENSE("GPL");
216 MODULE_DESCRIPTION("PMU battery driver");
217