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