Root/drivers/power/pmu_battery.c

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
19static 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
32static 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
48static enum power_supply_property pmu_ac_props[] = {
49    POWER_SUPPLY_PROP_ONLINE,
50};
51
52static 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
64static char *pmu_batt_types[] = {
65    "Smart", "Comet", "Hooper", "Unknown"
66};
67
68static 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
82static 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
126static 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
141static struct platform_device *bat_pdev;
142
143static 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
182battery_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);
190ac_register_failed:
191    platform_device_unregister(bat_pdev);
192pdev_register_failed:
193success:
194    return ret;
195}
196
197static 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
211module_init(pmu_bat_init);
212module_exit(pmu_bat_exit);
213
214MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
215MODULE_LICENSE("GPL");
216MODULE_DESCRIPTION("PMU battery driver");
217

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