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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 <andrew.grover@intel.com>
6 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
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_CLASS "ac_adapter"
25#define ACPI_AC_DEVICE_NAME "AC Adapter"
26#define ACPI_AC_FILE_STATE "state"
27#define ACPI_AC_NOTIFY_STATUS 0x80
28#define ACPI_AC_STATUS_OFFLINE 0x00
29#define ACPI_AC_STATUS_ONLINE 0x01
30#define ACPI_AC_STATUS_UNKNOWN 0xFF
31
32MODULE_AUTHOR("Paul Diefenbaugh");
33MODULE_DESCRIPTION("ACPI AC Adapter Driver");
34MODULE_LICENSE("GPL");
35
36static int acpi_ac_probe(struct platform_device *pdev);
37static void acpi_ac_remove(struct platform_device *pdev);
38
39static void acpi_ac_notify(acpi_handle handle, u32 event, void *data);
40
41static const struct acpi_device_id ac_device_ids[] = {
42 {"ACPI0003", 0},
43 {"", 0},
44};
45MODULE_DEVICE_TABLE(acpi, ac_device_ids);
46
47#ifdef CONFIG_PM_SLEEP
48static int acpi_ac_resume(struct device *dev);
49#endif
50static SIMPLE_DEV_PM_OPS(acpi_ac_pm, NULL, acpi_ac_resume);
51
52static int ac_sleep_before_get_state_ms;
53static int ac_only;
54
55struct acpi_ac {
56 struct power_supply *charger;
57 struct power_supply_desc charger_desc;
58 struct acpi_device *device;
59 unsigned long long state;
60 struct notifier_block battery_nb;
61};
62
63#define to_acpi_ac(x) power_supply_get_drvdata(x)
64
65/* AC Adapter Management */
66static int acpi_ac_get_state(struct acpi_ac *ac)
67{
68 acpi_status status = AE_OK;
69
70 if (!ac)
71 return -EINVAL;
72
73 if (ac_only) {
74 ac->state = 1;
75 return 0;
76 }
77
78 status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL,
79 &ac->state);
80 if (ACPI_FAILURE(status)) {
81 acpi_handle_info(ac->device->handle,
82 "Error reading AC Adapter state: %s\n",
83 acpi_format_exception(status));
84 ac->state = ACPI_AC_STATUS_UNKNOWN;
85 return -ENODEV;
86 }
87
88 return 0;
89}
90
91/* sysfs I/F */
92static int get_ac_property(struct power_supply *psy,
93 enum power_supply_property psp,
94 union power_supply_propval *val)
95{
96 struct acpi_ac *ac = to_acpi_ac(psy);
97
98 if (!ac)
99 return -ENODEV;
100
101 if (acpi_ac_get_state(ac))
102 return -ENODEV;
103
104 switch (psp) {
105 case POWER_SUPPLY_PROP_ONLINE:
106 val->intval = ac->state;
107 break;
108 default:
109 return -EINVAL;
110 }
111
112 return 0;
113}
114
115static const enum power_supply_property ac_props[] = {
116 POWER_SUPPLY_PROP_ONLINE,
117};
118
119/* Driver Model */
120static void acpi_ac_notify(acpi_handle handle, u32 event, void *data)
121{
122 struct acpi_ac *ac = data;
123 struct acpi_device *adev = ac->device;
124
125 switch (event) {
126 default:
127 acpi_handle_debug(adev->handle, "Unsupported event [0x%x]\n",
128 event);
129 fallthrough;
130 case ACPI_AC_NOTIFY_STATUS:
131 case ACPI_NOTIFY_BUS_CHECK:
132 case ACPI_NOTIFY_DEVICE_CHECK:
133 /*
134 * A buggy BIOS may notify AC first and then sleep for
135 * a specific time before doing actual operations in the
136 * EC event handler (_Qxx). This will cause the AC state
137 * reported by the ACPI event to be incorrect, so wait for a
138 * specific time for the EC event handler to make progress.
139 */
140 if (ac_sleep_before_get_state_ms > 0)
141 msleep(ac_sleep_before_get_state_ms);
142
143 acpi_ac_get_state(ac);
144 acpi_bus_generate_netlink_event(adev->pnp.device_class,
145 dev_name(&adev->dev), event,
146 (u32) ac->state);
147 acpi_notifier_call_chain(adev, event, (u32) ac->state);
148 power_supply_changed(ac->charger);
149 }
150}
151
152static int acpi_ac_battery_notify(struct notifier_block *nb,
153 unsigned long action, void *data)
154{
155 struct acpi_ac *ac = container_of(nb, struct acpi_ac, battery_nb);
156 struct acpi_bus_event *event = (struct acpi_bus_event *)data;
157
158 /*
159 * On HP Pavilion dv6-6179er AC status notifications aren't triggered
160 * when adapter is plugged/unplugged. However, battery status
161 * notifications are triggered when battery starts charging or
162 * discharging. Re-reading AC status triggers lost AC notifications,
163 * if AC status has changed.
164 */
165 if (strcmp(event->device_class, ACPI_BATTERY_CLASS) == 0 &&
166 event->type == ACPI_BATTERY_NOTIFY_STATUS)
167 acpi_ac_get_state(ac);
168
169 return NOTIFY_OK;
170}
171
172static int __init thinkpad_e530_quirk(const struct dmi_system_id *d)
173{
174 ac_sleep_before_get_state_ms = 1000;
175 return 0;
176}
177
178static int __init ac_only_quirk(const struct dmi_system_id *d)
179{
180 ac_only = 1;
181 return 0;
182}
183
184/* Please keep this list alphabetically sorted */
185static const struct dmi_system_id ac_dmi_table[] __initconst = {
186 {
187 /* Kodlix GK45 returning incorrect state */
188 .callback = ac_only_quirk,
189 .matches = {
190 DMI_MATCH(DMI_PRODUCT_NAME, "GK45"),
191 },
192 },
193 {
194 /* Lenovo Thinkpad e530, see comment in acpi_ac_notify() */
195 .callback = thinkpad_e530_quirk,
196 .matches = {
197 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
198 DMI_MATCH(DMI_PRODUCT_NAME, "32597CG"),
199 },
200 },
201 {},
202};
203
204static int acpi_ac_probe(struct platform_device *pdev)
205{
206 struct acpi_device *adev = ACPI_COMPANION(&pdev->dev);
207 struct power_supply_config psy_cfg = {};
208 struct acpi_ac *ac;
209 int result;
210
211 ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL);
212 if (!ac)
213 return -ENOMEM;
214
215 ac->device = adev;
216 strscpy(acpi_device_name(adev), ACPI_AC_DEVICE_NAME);
217 strscpy(acpi_device_class(adev), ACPI_AC_CLASS);
218
219 platform_set_drvdata(pdev, ac);
220
221 result = acpi_ac_get_state(ac);
222 if (result)
223 goto err_release_ac;
224
225 psy_cfg.drv_data = ac;
226
227 ac->charger_desc.name = acpi_device_bid(adev);
228 ac->charger_desc.type = POWER_SUPPLY_TYPE_MAINS;
229 ac->charger_desc.properties = ac_props;
230 ac->charger_desc.num_properties = ARRAY_SIZE(ac_props);
231 ac->charger_desc.get_property = get_ac_property;
232 ac->charger = power_supply_register(&pdev->dev,
233 &ac->charger_desc, &psy_cfg);
234 if (IS_ERR(ac->charger)) {
235 result = PTR_ERR(ac->charger);
236 goto err_release_ac;
237 }
238
239 pr_info("%s [%s] (%s-line)\n", acpi_device_name(adev),
240 acpi_device_bid(adev), str_on_off(ac->state));
241
242 ac->battery_nb.notifier_call = acpi_ac_battery_notify;
243 register_acpi_notifier(&ac->battery_nb);
244
245 result = acpi_dev_install_notify_handler(adev, ACPI_ALL_NOTIFY,
246 acpi_ac_notify, ac);
247 if (result)
248 goto err_unregister;
249
250 return 0;
251
252err_unregister:
253 power_supply_unregister(ac->charger);
254 unregister_acpi_notifier(&ac->battery_nb);
255err_release_ac:
256 kfree(ac);
257
258 return result;
259}
260
261#ifdef CONFIG_PM_SLEEP
262static int acpi_ac_resume(struct device *dev)
263{
264 struct acpi_ac *ac = dev_get_drvdata(dev);
265 unsigned int old_state;
266
267 old_state = ac->state;
268 if (acpi_ac_get_state(ac))
269 return 0;
270 if (old_state != ac->state)
271 power_supply_changed(ac->charger);
272
273 return 0;
274}
275#else
276#define acpi_ac_resume NULL
277#endif
278
279static void acpi_ac_remove(struct platform_device *pdev)
280{
281 struct acpi_ac *ac = platform_get_drvdata(pdev);
282
283 acpi_dev_remove_notify_handler(ac->device, ACPI_ALL_NOTIFY,
284 acpi_ac_notify);
285 power_supply_unregister(ac->charger);
286 unregister_acpi_notifier(&ac->battery_nb);
287
288 kfree(ac);
289}
290
291static struct platform_driver acpi_ac_driver = {
292 .probe = acpi_ac_probe,
293 .remove = acpi_ac_remove,
294 .driver = {
295 .name = "ac",
296 .acpi_match_table = ac_device_ids,
297 .pm = &acpi_ac_pm,
298 },
299};
300
301static int __init acpi_ac_init(void)
302{
303 int result;
304
305 if (acpi_disabled)
306 return -ENODEV;
307
308 if (acpi_quirk_skip_acpi_ac_and_battery())
309 return -ENODEV;
310
311 dmi_check_system(ac_dmi_table);
312
313 result = platform_driver_register(&acpi_ac_driver);
314 if (result < 0)
315 return -ENODEV;
316
317 return 0;
318}
319
320static void __exit acpi_ac_exit(void)
321{
322 platform_driver_unregister(&acpi_ac_driver);
323}
324module_init(acpi_ac_init);
325module_exit(acpi_ac_exit);
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 <andrew.grover@intel.com>
6 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
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/acpi.h>
21#include <acpi/battery.h>
22
23#define ACPI_AC_CLASS "ac_adapter"
24#define ACPI_AC_DEVICE_NAME "AC Adapter"
25#define ACPI_AC_FILE_STATE "state"
26#define ACPI_AC_NOTIFY_STATUS 0x80
27#define ACPI_AC_STATUS_OFFLINE 0x00
28#define ACPI_AC_STATUS_ONLINE 0x01
29#define ACPI_AC_STATUS_UNKNOWN 0xFF
30
31MODULE_AUTHOR("Paul Diefenbaugh");
32MODULE_DESCRIPTION("ACPI AC Adapter Driver");
33MODULE_LICENSE("GPL");
34
35static int acpi_ac_add(struct acpi_device *device);
36static void acpi_ac_remove(struct acpi_device *device);
37static void acpi_ac_notify(struct acpi_device *device, u32 event);
38
39static const struct acpi_device_id ac_device_ids[] = {
40 {"ACPI0003", 0},
41 {"", 0},
42};
43MODULE_DEVICE_TABLE(acpi, ac_device_ids);
44
45#ifdef CONFIG_PM_SLEEP
46static int acpi_ac_resume(struct device *dev);
47#endif
48static SIMPLE_DEV_PM_OPS(acpi_ac_pm, NULL, acpi_ac_resume);
49
50static int ac_sleep_before_get_state_ms;
51static int ac_only;
52
53static struct acpi_driver acpi_ac_driver = {
54 .name = "ac",
55 .class = ACPI_AC_CLASS,
56 .ids = ac_device_ids,
57 .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
58 .ops = {
59 .add = acpi_ac_add,
60 .remove = acpi_ac_remove,
61 .notify = acpi_ac_notify,
62 },
63 .drv.pm = &acpi_ac_pm,
64};
65
66struct acpi_ac {
67 struct power_supply *charger;
68 struct power_supply_desc charger_desc;
69 struct acpi_device *device;
70 unsigned long long state;
71 struct notifier_block battery_nb;
72};
73
74#define to_acpi_ac(x) power_supply_get_drvdata(x)
75
76/* AC Adapter Management */
77static int acpi_ac_get_state(struct acpi_ac *ac)
78{
79 acpi_status status = AE_OK;
80
81 if (!ac)
82 return -EINVAL;
83
84 if (ac_only) {
85 ac->state = 1;
86 return 0;
87 }
88
89 status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL,
90 &ac->state);
91 if (ACPI_FAILURE(status)) {
92 acpi_handle_info(ac->device->handle,
93 "Error reading AC Adapter state: %s\n",
94 acpi_format_exception(status));
95 ac->state = ACPI_AC_STATUS_UNKNOWN;
96 return -ENODEV;
97 }
98
99 return 0;
100}
101
102/* sysfs I/F */
103static int get_ac_property(struct power_supply *psy,
104 enum power_supply_property psp,
105 union power_supply_propval *val)
106{
107 struct acpi_ac *ac = to_acpi_ac(psy);
108
109 if (!ac)
110 return -ENODEV;
111
112 if (acpi_ac_get_state(ac))
113 return -ENODEV;
114
115 switch (psp) {
116 case POWER_SUPPLY_PROP_ONLINE:
117 val->intval = ac->state;
118 break;
119 default:
120 return -EINVAL;
121 }
122
123 return 0;
124}
125
126static enum power_supply_property ac_props[] = {
127 POWER_SUPPLY_PROP_ONLINE,
128};
129
130/* Driver Model */
131static void acpi_ac_notify(struct acpi_device *device, u32 event)
132{
133 struct acpi_ac *ac = acpi_driver_data(device);
134
135 if (!ac)
136 return;
137
138 switch (event) {
139 default:
140 acpi_handle_debug(device->handle, "Unsupported event [0x%x]\n",
141 event);
142 fallthrough;
143 case ACPI_AC_NOTIFY_STATUS:
144 case ACPI_NOTIFY_BUS_CHECK:
145 case ACPI_NOTIFY_DEVICE_CHECK:
146 /*
147 * A buggy BIOS may notify AC first and then sleep for
148 * a specific time before doing actual operations in the
149 * EC event handler (_Qxx). This will cause the AC state
150 * reported by the ACPI event to be incorrect, so wait for a
151 * specific time for the EC event handler to make progress.
152 */
153 if (ac_sleep_before_get_state_ms > 0)
154 msleep(ac_sleep_before_get_state_ms);
155
156 acpi_ac_get_state(ac);
157 acpi_bus_generate_netlink_event(device->pnp.device_class,
158 dev_name(&device->dev), event,
159 (u32) ac->state);
160 acpi_notifier_call_chain(device, event, (u32) ac->state);
161 kobject_uevent(&ac->charger->dev.kobj, KOBJ_CHANGE);
162 }
163}
164
165static int acpi_ac_battery_notify(struct notifier_block *nb,
166 unsigned long action, void *data)
167{
168 struct acpi_ac *ac = container_of(nb, struct acpi_ac, battery_nb);
169 struct acpi_bus_event *event = (struct acpi_bus_event *)data;
170
171 /*
172 * On HP Pavilion dv6-6179er AC status notifications aren't triggered
173 * when adapter is plugged/unplugged. However, battery status
174 * notifications are triggered when battery starts charging or
175 * discharging. Re-reading AC status triggers lost AC notifications,
176 * if AC status has changed.
177 */
178 if (strcmp(event->device_class, ACPI_BATTERY_CLASS) == 0 &&
179 event->type == ACPI_BATTERY_NOTIFY_STATUS)
180 acpi_ac_get_state(ac);
181
182 return NOTIFY_OK;
183}
184
185static int __init thinkpad_e530_quirk(const struct dmi_system_id *d)
186{
187 ac_sleep_before_get_state_ms = 1000;
188 return 0;
189}
190
191static int __init ac_only_quirk(const struct dmi_system_id *d)
192{
193 ac_only = 1;
194 return 0;
195}
196
197/* Please keep this list alphabetically sorted */
198static const struct dmi_system_id ac_dmi_table[] __initconst = {
199 {
200 /* Kodlix GK45 returning incorrect state */
201 .callback = ac_only_quirk,
202 .matches = {
203 DMI_MATCH(DMI_PRODUCT_NAME, "GK45"),
204 },
205 },
206 {
207 /* Lenovo Thinkpad e530, see comment in acpi_ac_notify() */
208 .callback = thinkpad_e530_quirk,
209 .matches = {
210 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
211 DMI_MATCH(DMI_PRODUCT_NAME, "32597CG"),
212 },
213 },
214 {},
215};
216
217static int acpi_ac_add(struct acpi_device *device)
218{
219 struct power_supply_config psy_cfg = {};
220 int result = 0;
221 struct acpi_ac *ac = NULL;
222
223
224 if (!device)
225 return -EINVAL;
226
227 ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL);
228 if (!ac)
229 return -ENOMEM;
230
231 ac->device = device;
232 strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME);
233 strcpy(acpi_device_class(device), ACPI_AC_CLASS);
234 device->driver_data = ac;
235
236 result = acpi_ac_get_state(ac);
237 if (result)
238 goto end;
239
240 psy_cfg.drv_data = ac;
241
242 ac->charger_desc.name = acpi_device_bid(device);
243 ac->charger_desc.type = POWER_SUPPLY_TYPE_MAINS;
244 ac->charger_desc.properties = ac_props;
245 ac->charger_desc.num_properties = ARRAY_SIZE(ac_props);
246 ac->charger_desc.get_property = get_ac_property;
247 ac->charger = power_supply_register(&ac->device->dev,
248 &ac->charger_desc, &psy_cfg);
249 if (IS_ERR(ac->charger)) {
250 result = PTR_ERR(ac->charger);
251 goto end;
252 }
253
254 pr_info("%s [%s] (%s)\n", acpi_device_name(device),
255 acpi_device_bid(device), ac->state ? "on-line" : "off-line");
256
257 ac->battery_nb.notifier_call = acpi_ac_battery_notify;
258 register_acpi_notifier(&ac->battery_nb);
259end:
260 if (result)
261 kfree(ac);
262
263 return result;
264}
265
266#ifdef CONFIG_PM_SLEEP
267static int acpi_ac_resume(struct device *dev)
268{
269 struct acpi_ac *ac;
270 unsigned int old_state;
271
272 if (!dev)
273 return -EINVAL;
274
275 ac = acpi_driver_data(to_acpi_device(dev));
276 if (!ac)
277 return -EINVAL;
278
279 old_state = ac->state;
280 if (acpi_ac_get_state(ac))
281 return 0;
282 if (old_state != ac->state)
283 kobject_uevent(&ac->charger->dev.kobj, KOBJ_CHANGE);
284
285 return 0;
286}
287#else
288#define acpi_ac_resume NULL
289#endif
290
291static void acpi_ac_remove(struct acpi_device *device)
292{
293 struct acpi_ac *ac = NULL;
294
295 if (!device || !acpi_driver_data(device))
296 return;
297
298 ac = acpi_driver_data(device);
299
300 power_supply_unregister(ac->charger);
301 unregister_acpi_notifier(&ac->battery_nb);
302
303 kfree(ac);
304}
305
306static int __init acpi_ac_init(void)
307{
308 int result;
309
310 if (acpi_disabled)
311 return -ENODEV;
312
313 if (acpi_quirk_skip_acpi_ac_and_battery())
314 return -ENODEV;
315
316 dmi_check_system(ac_dmi_table);
317
318 result = acpi_bus_register_driver(&acpi_ac_driver);
319 if (result < 0)
320 return -ENODEV;
321
322 return 0;
323}
324
325static void __exit acpi_ac_exit(void)
326{
327 acpi_bus_unregister_driver(&acpi_ac_driver);
328}
329module_init(acpi_ac_init);
330module_exit(acpi_ac_exit);