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 | |
16 | static 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 | |
30 | static 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 | |
46 | static enum power_supply_property pmu_ac_props[] = { |
47 | POWER_SUPPLY_PROP_ONLINE, |
48 | }; |
49 | |
50 | static 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 | |
58 | static struct power_supply *pmu_ac; |
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 = 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(size: 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->pbi = &pmu_batteries[i]; |
174 | psy_cfg.drv_data = pbat; |
175 | |
176 | pbat->bat = power_supply_register(parent: &bat_pdev->dev, |
177 | desc: &pbat->bat_desc, |
178 | cfg: &psy_cfg); |
179 | if (IS_ERR(ptr: pbat->bat)) { |
180 | ret = PTR_ERR(ptr: pbat->bat); |
181 | kfree(objp: pbat); |
182 | goto battery_register_failed; |
183 | } |
184 | pbats[i] = pbat; |
185 | } |
186 | |
187 | goto success; |
188 | |
189 | battery_register_failed: |
190 | while (i--) { |
191 | if (!pbats[i]) |
192 | continue; |
193 | power_supply_unregister(psy: pbats[i]->bat); |
194 | kfree(objp: pbats[i]); |
195 | } |
196 | power_supply_unregister(psy: pmu_ac); |
197 | ac_register_failed: |
198 | platform_device_unregister(bat_pdev); |
199 | pdev_register_failed: |
200 | success: |
201 | return ret; |
202 | } |
203 | |
204 | static void __exit pmu_bat_exit(void) |
205 | { |
206 | int i; |
207 | |
208 | for (i = 0; i < PMU_MAX_BATTERIES; i++) { |
209 | if (!pbats[i]) |
210 | continue; |
211 | power_supply_unregister(psy: pbats[i]->bat); |
212 | kfree(objp: pbats[i]); |
213 | } |
214 | power_supply_unregister(psy: pmu_ac); |
215 | platform_device_unregister(bat_pdev); |
216 | } |
217 | |
218 | module_init(pmu_bat_init); |
219 | module_exit(pmu_bat_exit); |
220 | |
221 | MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>" ); |
222 | MODULE_LICENSE("GPL" ); |
223 | MODULE_DESCRIPTION("PMU battery driver" ); |
224 | |