summaryrefslogtreecommitdiffstats
path: root/drivers/power/pmu_battery.c
blob: 9c87ad564803b96f0b915b75edaf2ae48fd7bfaf (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
/*
 * Battery class driver for Apple PMU
 *
 *	Copyright © 2006  David Woodhouse <dwmw2@infradead.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/err.h>
#include <linux/power_supply.h>
#include <linux/adb.h>
#include <linux/pmu.h>

static struct pmu_battery_dev {
	struct power_supply bat;
	struct pmu_battery_info *pbi;
	char name[16];
	int propval;
} *pbats[PMU_MAX_BATTERIES];

#define to_pmu_battery_dev(x) container_of(x, struct pmu_battery_dev, bat)

/*********************************************************************
 *		Power
 *********************************************************************/

static int pmu_get_ac_prop(struct power_supply *psy,
			   enum power_supply_property psp,
			   union power_supply_propval *val)
{
	switch (psp) {
	case POWER_SUPPLY_PROP_ONLINE:
		val->intval = (!!(pmu_power_flags & PMU_PWR_AC_PRESENT)) ||
			      (pmu_battery_count == 0);
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

static enum power_supply_property pmu_ac_props[] = {
	POWER_SUPPLY_PROP_ONLINE,
};

static struct power_supply pmu_ac = {
	.name = "pmu-ac",
	.type = POWER_SUPPLY_TYPE_MAINS,
	.properties = pmu_ac_props,
	.num_properties = ARRAY_SIZE(pmu_ac_props),
	.get_property = pmu_get_ac_prop,
};

/*********************************************************************
 *		Battery properties
 *********************************************************************/

static char *pmu_batt_types[] = {
	"Smart", "Comet", "Hooper", "Unknown"
};

static char *pmu_bat_get_model_name(struct pmu_battery_info *pbi)
{
	switch (pbi->flags & PMU_BATT_TYPE_MASK) {
	case PMU_BATT_TYPE_SMART:
		return pmu_batt_types[0];
	case PMU_BATT_TYPE_COMET:
		return pmu_batt_types[1];
	case PMU_BATT_TYPE_HOOPER:
		return pmu_batt_types[2];
	default: break;
	}
	return pmu_batt_types[3];
}

static int pmu_bat_get_property(struct power_supply *psy,
				enum power_supply_property psp,
				union power_supply_propval *val)
{
	struct pmu_battery_dev *pbat = to_pmu_battery_dev(psy);
	struct pmu_battery_info *pbi = pbat->pbi;

	switch (psp) {
	case POWER_SUPPLY_PROP_STATUS:
		if (pbi->flags & PMU_BATT_CHARGING)
			val->intval = POWER_SUPPLY_STATUS_CHARGING;
		else if (pmu_power_flags & PMU_PWR_AC_PRESENT)
			val->intval = POWER_SUPPLY_STATUS_FULL;
		else
			val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
		break;
	case POWER_SUPPLY_PROP_PRESENT:
		val->intval = !!(pbi->flags & PMU_BATT_PRESENT);
		break;
	case POWER_SUPPLY_PROP_MODEL_NAME:
		val->strval = pmu_bat_get_model_name(pbi);
		break;
	case POWER_SUPPLY_PROP_ENERGY_AVG:
		val->intval = pbi->charge     * 1000; /* mWh -> µWh */
		break;
	case POWER_SUPPLY_PROP_ENERGY_FULL:
		val->intval = pbi->max_charge * 1000; /* mWh -> µWh */
		break;
	case POWER_SUPPLY_PROP_CURRENT_AVG:
		val->intval = pbi->amperage   * 1000; /* mA -> µA */
		break;
	case POWER_SUPPLY_PROP_VOLTAGE_AVG:
		val->intval = pbi->voltage    * 1000; /* mV -> µV */
		break;
	case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
		val->intval = pbi->time_remaining;
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

static enum power_supply_property pmu_bat_props[] = {
	POWER_SUPPLY_PROP_STATUS,
	POWER_SUPPLY_PROP_PRESENT,
	POWER_SUPPLY_PROP_MODEL_NAME,
	POWER_SUPPLY_PROP_ENERGY_AVG,
	POWER_SUPPLY_PROP_ENERGY_FULL,
	POWER_SUPPLY_PROP_CURRENT_AVG,
	POWER_SUPPLY_PROP_VOLTAGE_AVG,
	POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
};

/*********************************************************************
 *		Initialisation
 *********************************************************************/

static struct platform_device *bat_pdev;

static int __init pmu_bat_init(void)
{
	int ret;
	int i;

	bat_pdev = platform_device_register_simple("pmu-battery",
						   0, NULL, 0);
	if (IS_ERR(bat_pdev)) {
		ret = PTR_ERR(bat_pdev);
		goto pdev_register_failed;
	}

	ret = power_supply_register(&bat_pdev->dev, &pmu_ac);
	if (ret)
		goto ac_register_failed;

	for (i = 0; i < pmu_battery_count; i++) {
		struct pmu_battery_dev *pbat = kzalloc(sizeof(*pbat),
						       GFP_KERNEL);
		if (!pbat)
			break;

		sprintf(pbat->name, "PMU_battery_%d", i);
		pbat->bat.name = pbat->name;
		pbat->bat.properties = pmu_bat_props;
		pbat->bat.num_properties = ARRAY_SIZE(pmu_bat_props);
		pbat->bat.get_property = pmu_bat_get_property;
		pbat->pbi = &pmu_batteries[i];

		ret = power_supply_register(&bat_pdev->dev, &pbat->bat);
		if (ret) {
			kfree(pbat);
			goto battery_register_failed;
		}
		pbats[i] = pbat;
	}

	goto success;

battery_register_failed:
	while (i--) {
		if (!pbats[i])
			continue;
		power_supply_unregister(&pbats[i]->bat);
		kfree(pbats[i]);
	}
	power_supply_unregister(&pmu_ac);
ac_register_failed:
	platform_device_unregister(bat_pdev);
pdev_register_failed:
success:
	return ret;
}

static void __exit pmu_bat_exit(void)
{
	int i;

	for (i = 0; i < PMU_MAX_BATTERIES; i++) {
		if (!pbats[i])
			continue;
		power_supply_unregister(&pbats[i]->bat);
		kfree(pbats[i]);
	}
	power_supply_unregister(&pmu_ac);
	platform_device_unregister(bat_pdev);
}

module_init(pmu_bat_init);
module_exit(pmu_bat_exit);

MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("PMU battery driver");