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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * acpi_ac.c - ACPI AC Adapter Driver (Revision: 27)
4 *
5 * Copyright (C) 2001, 2002 Andy Grover <[email protected]>
6 * Copyright (C) 2001, 2002 Paul Diefenbaugh <[email protected]>
7 */
8
9#define pr_fmt(fmt) "ACPI: AC: " fmt
10
11#include <linux/kernel.h>
12#include <linux/module.h>
13#include <linux/slab.h>
14#include <linux/init.h>
15#include <linux/types.h>
16#include <linux/dmi.h>
17#include <linux/delay.h>
18#include <linux/platform_device.h>
19#include <linux/power_supply.h>
20#include <linux/string_choices.h>
21#include <linux/acpi.h>
22#include <acpi/battery.h>
23
24#define ACPI_AC_FILE_STATE "state"
25#define ACPI_AC_NOTIFY_STATUS 0x80
26#define ACPI_AC_STATUS_OFFLINE 0x00
27#define ACPI_AC_STATUS_ONLINE 0x01
28#define ACPI_AC_STATUS_UNKNOWN 0xFF
29
30MODULE_AUTHOR("Paul Diefenbaugh");
31MODULE_DESCRIPTION("ACPI AC Adapter Driver");
32MODULE_LICENSE("GPL");
33
34static const struct acpi_device_id ac_device_ids[] = {
35 {"ACPI0003", 0},
36 {"", 0},
37};
38MODULE_DEVICE_TABLE(acpi, ac_device_ids);
39
40static int ac_sleep_before_get_state_ms;
41static int ac_only;
42
43struct acpi_ac {
44 struct power_supply *charger;
45 struct power_supply_desc charger_desc;
46 struct acpi_device *device;
47 unsigned long long state;
48 struct notifier_block battery_nb;
49};
50
51#define to_acpi_ac(x) power_supply_get_drvdata(x)
52
53/* AC Adapter Management */
54static int acpi_ac_get_state(struct acpi_ac *ac)
55{
56 acpi_status status = AE_OK;
57
58 if (!ac)
59 return -EINVAL;
60
61 if (ac_only) {
62 ac->state = 1;
63 return 0;
64 }
65
66 status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL,
67 &ac->state);
68 if (ACPI_FAILURE(status)) {
69 acpi_handle_info(ac->device->handle,
70 "Error reading AC Adapter state: %s\n",
71 acpi_format_exception(status));
72 ac->state = ACPI_AC_STATUS_UNKNOWN;
73 return -ENODEV;
74 }
75
76 return 0;
77}
78
79/* sysfs I/F */
80static int get_ac_property(struct power_supply *psy,
81 enum power_supply_property psp,
82 union power_supply_propval *val)
83{
84 struct acpi_ac *ac = to_acpi_ac(psy);
85
86 if (!ac)
87 return -ENODEV;
88
89 if (acpi_ac_get_state(ac))
90 return -ENODEV;
91
92 switch (psp) {
93 case POWER_SUPPLY_PROP_ONLINE:
94 val->intval = ac->state;
95 break;
96 default:
97 return -EINVAL;
98 }
99
100 return 0;
101}
102
103static const enum power_supply_property ac_props[] = {
104 POWER_SUPPLY_PROP_ONLINE,
105};
106
107/* Driver Model */
108static void acpi_ac_notify(acpi_handle handle, u32 event, void *data)
109{
110 struct acpi_ac *ac = data;
111 struct acpi_device *adev = ac->device;
112
113 switch (event) {
114 default:
115 acpi_handle_debug(adev->handle, "Unsupported event [0x%x]\n",
116 event);
117 fallthrough;
118 case ACPI_AC_NOTIFY_STATUS:
119 case ACPI_NOTIFY_BUS_CHECK:
120 case ACPI_NOTIFY_DEVICE_CHECK:
121 /*
122 * A buggy BIOS may notify AC first and then sleep for
123 * a specific time before doing actual operations in the
124 * EC event handler (_Qxx). This will cause the AC state
125 * reported by the ACPI event to be incorrect, so wait for a
126 * specific time for the EC event handler to make progress.
127 */
128 if (ac_sleep_before_get_state_ms > 0)
129 msleep(ac_sleep_before_get_state_ms);
130
131 acpi_ac_get_state(ac);
132 acpi_bus_generate_netlink_event(ACPI_AC_CLASS,
133 dev_name(&adev->dev), event,
134 ac->state);
135 acpi_notifier_call_chain(ACPI_AC_CLASS, acpi_device_bid(adev),
136 event, ac->state);
137 power_supply_changed(ac->charger);
138 }
139}
140
141static int acpi_ac_battery_notify(struct notifier_block *nb,
142 unsigned long action, void *data)
143{
144 struct acpi_ac *ac = container_of(nb, struct acpi_ac, battery_nb);
145 struct acpi_bus_event *event = (struct acpi_bus_event *)data;
146
147 /*
148 * On HP Pavilion dv6-6179er AC status notifications aren't triggered
149 * when adapter is plugged/unplugged. However, battery status
150 * notifications are triggered when battery starts charging or
151 * discharging. Re-reading AC status triggers lost AC notifications,
152 * if AC status has changed.
153 */
154 if (strcmp(event->device_class, ACPI_BATTERY_CLASS) == 0 &&
155 event->type == ACPI_BATTERY_NOTIFY_STATUS)
156 acpi_ac_get_state(ac);
157
158 return NOTIFY_OK;
159}
160
161static int __init thinkpad_e530_quirk(const struct dmi_system_id *d)
162{
163 ac_sleep_before_get_state_ms = 1000;
164 return 0;
165}
166
167static int __init ac_only_quirk(const struct dmi_system_id *d)
168{
169 ac_only = 1;
170 return 0;
171}
172
173/* Please keep this list alphabetically sorted */
174static const struct dmi_system_id ac_dmi_table[] __initconst = {
175 {
176 /* Kodlix GK45 returning incorrect state */
177 .callback = ac_only_quirk,
178 .matches = {
179 DMI_MATCH(DMI_PRODUCT_NAME, "GK45"),
180 },
181 },
182 {
183 /* Lenovo Thinkpad e530, see comment in acpi_ac_notify() */
184 .callback = thinkpad_e530_quirk,
185 .matches = {
186 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
187 DMI_MATCH(DMI_PRODUCT_NAME, "32597CG"),
188 },
189 },
190 {},
191};
192
193static int acpi_ac_probe(struct platform_device *pdev)
194{
195 struct power_supply_config psy_cfg = {};
196 struct device *dev = &pdev->dev;
197 struct acpi_device *adev;
198 struct acpi_ac *ac;
199 int result;
200
201 adev = ACPI_COMPANION(&pdev->dev);
202 if (!adev)
203 return -ENODEV;
204
205 ac = devm_kzalloc(dev, sizeof(*ac), GFP_KERNEL);
206 if (!ac)
207 return -ENOMEM;
208
209 ac->device = adev;
210
211 platform_set_drvdata(pdev, ac);
212
213 result = acpi_ac_get_state(ac);
214 if (result)
215 return result;
216
217 psy_cfg.drv_data = ac;
218
219 ac->charger_desc.name = acpi_device_bid(adev);
220 ac->charger_desc.type = POWER_SUPPLY_TYPE_MAINS;
221 ac->charger_desc.properties = ac_props;
222 ac->charger_desc.num_properties = ARRAY_SIZE(ac_props);
223 ac->charger_desc.get_property = get_ac_property;
224 ac->charger = devm_power_supply_register(dev, &ac->charger_desc, &psy_cfg);
225 if (IS_ERR(ac->charger))
226 return PTR_ERR(ac->charger);
227
228 pr_info("AC Adapter [%s] (%s-line)\n", acpi_device_bid(adev),
229 str_on_off(ac->state));
230
231 result = devm_acpi_install_notify_handler(dev, ACPI_ALL_NOTIFY,
232 acpi_ac_notify, ac);
233 if (result)
234 return result;
235
236 ac->battery_nb.notifier_call = acpi_ac_battery_notify;
237 register_acpi_notifier(&ac->battery_nb);
238
239 return 0;
240}
241
242#ifdef CONFIG_PM_SLEEP
243static int acpi_ac_resume(struct device *dev)
244{
245 struct acpi_ac *ac = dev_get_drvdata(dev);
246 unsigned int old_state;
247
248 old_state = ac->state;
249 if (acpi_ac_get_state(ac))
250 return 0;
251 if (old_state != ac->state)
252 power_supply_changed(ac->charger);
253
254 return 0;
255}
256#endif
257
258static SIMPLE_DEV_PM_OPS(acpi_ac_pm, NULL, acpi_ac_resume);
259
260static void acpi_ac_remove(struct platform_device *pdev)
261{
262 struct acpi_ac *ac = platform_get_drvdata(pdev);
263
264 unregister_acpi_notifier(&ac->battery_nb);
265}
266
267static struct platform_driver acpi_ac_driver = {
268 .probe = acpi_ac_probe,
269 .remove = acpi_ac_remove,
270 .driver = {
271 .name = "ac",
272 .acpi_match_table = ac_device_ids,
273 .pm = &acpi_ac_pm,
274 },
275};
276
277static int __init acpi_ac_init(void)
278{
279 int result;
280
281 if (acpi_disabled)
282 return -ENODEV;
283
284 if (acpi_quirk_skip_acpi_ac_and_battery())
285 return -ENODEV;
286
287 dmi_check_system(ac_dmi_table);
288
289 result = platform_driver_register(&acpi_ac_driver);
290 if (result < 0)
291 return -ENODEV;
292
293 return 0;
294}
295
296static void __exit acpi_ac_exit(void)
297{
298 platform_driver_unregister(&acpi_ac_driver);
299}
300module_init(acpi_ac_init);
301module_exit(acpi_ac_exit);