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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 | |
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 | |
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 | |
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 | |
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 | |
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 |
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