1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Battery class driver for Apple PMU
4 *
5 * Copyright © 2006 David Woodhouse <dwmw2@infradead.org>
6 */
7
8#include <linux/module.h>
9#include <linux/platform_device.h>
10#include <linux/err.h>
11#include <linux/power_supply.h>
12#include <linux/adb.h>
13#include <linux/pmu.h>
14#include <linux/slab.h>
15
16static struct pmu_battery_dev {
17 struct power_supply *bat;
18 struct power_supply_desc bat_desc;
19 struct pmu_battery_info *pbi;
20 char name[16];
21 int propval;
22} *pbats[PMU_MAX_BATTERIES];
23
24#define to_pmu_battery_dev(x) power_supply_get_drvdata(x)
25
26/*********************************************************************
27 * Power
28 *********************************************************************/
29
30static int pmu_get_ac_prop(struct power_supply *psy,
31 enum power_supply_property psp,
32 union power_supply_propval *val)
33{
34 switch (psp) {
35 case POWER_SUPPLY_PROP_ONLINE:
36 val->intval = (!!(pmu_power_flags & PMU_PWR_AC_PRESENT)) ||
37 (pmu_battery_count == 0);
38 break;
39 default:
40 return -EINVAL;
41 }
42
43 return 0;
44}
45
46static enum power_supply_property pmu_ac_props[] = {
47 POWER_SUPPLY_PROP_ONLINE,
48};
49
50static const struct power_supply_desc pmu_ac_desc = {
51 .name = "pmu-ac",
52 .type = POWER_SUPPLY_TYPE_MAINS,
53 .properties = pmu_ac_props,
54 .num_properties = ARRAY_SIZE(pmu_ac_props),
55 .get_property = pmu_get_ac_prop,
56};
57
58static struct power_supply *pmu_ac;
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 = 0;
146 int i;
147
148 bat_pdev = platform_device_register_simple(name: "pmu-battery",
149 id: 0, NULL, num: 0);
150 if (IS_ERR(ptr: bat_pdev)) {
151 ret = PTR_ERR(ptr: bat_pdev);
152 goto pdev_register_failed;
153 }
154
155 pmu_ac = power_supply_register(parent: &bat_pdev->dev, desc: &pmu_ac_desc, NULL);
156 if (IS_ERR(ptr: pmu_ac)) {
157 ret = PTR_ERR(ptr: pmu_ac);
158 goto ac_register_failed;
159 }
160
161 for (i = 0; i < pmu_battery_count; i++) {
162 struct power_supply_config psy_cfg = {};
163 struct pmu_battery_dev *pbat = kzalloc(sizeof(*pbat),
164 GFP_KERNEL);
165 if (!pbat)
166 break;
167
168 sprintf(buf: pbat->name, fmt: "PMU_battery_%d", i);
169 pbat->bat_desc.name = pbat->name;
170 pbat->bat_desc.properties = pmu_bat_props;
171 pbat->bat_desc.num_properties = ARRAY_SIZE(pmu_bat_props);
172 pbat->bat_desc.get_property = pmu_bat_get_property;
173 pbat->bat_desc.type = POWER_SUPPLY_TYPE_BATTERY;
174 pbat->pbi = &pmu_batteries[i];
175 psy_cfg.drv_data = pbat;
176
177 pbat->bat = power_supply_register(parent: &bat_pdev->dev,
178 desc: &pbat->bat_desc,
179 cfg: &psy_cfg);
180 if (IS_ERR(ptr: pbat->bat)) {
181 ret = PTR_ERR(ptr: pbat->bat);
182 kfree(objp: pbat);
183 goto battery_register_failed;
184 }
185 pbats[i] = pbat;
186 }
187
188 goto success;
189
190battery_register_failed:
191 while (i--) {
192 if (!pbats[i])
193 continue;
194 power_supply_unregister(psy: pbats[i]->bat);
195 kfree(objp: pbats[i]);
196 }
197 power_supply_unregister(psy: pmu_ac);
198ac_register_failed:
199 platform_device_unregister(bat_pdev);
200pdev_register_failed:
201success:
202 return ret;
203}
204
205static void __exit pmu_bat_exit(void)
206{
207 int i;
208
209 for (i = 0; i < PMU_MAX_BATTERIES; i++) {
210 if (!pbats[i])
211 continue;
212 power_supply_unregister(psy: pbats[i]->bat);
213 kfree(objp: pbats[i]);
214 }
215 power_supply_unregister(psy: pmu_ac);
216 platform_device_unregister(bat_pdev);
217}
218
219module_init(pmu_bat_init);
220module_exit(pmu_bat_exit);
221
222MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
223MODULE_LICENSE("GPL");
224MODULE_DESCRIPTION("PMU battery driver");
225

source code of linux/drivers/power/supply/pmu_battery.c