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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/*
2 * acpi_ac.c - ACPI AC Adapter Driver ($Revision: 27 $)
3 *
4 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
5 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
6 *
7 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or (at
12 * your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write to the Free Software Foundation, Inc.,
21 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
22 *
23 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
24 */
25
26#include <linux/kernel.h>
27#include <linux/module.h>
28#include <linux/slab.h>
29#include <linux/init.h>
30#include <linux/types.h>
31#include <linux/dmi.h>
32#include <linux/delay.h>
33#include <linux/platform_device.h>
34#include <linux/power_supply.h>
35#include <linux/acpi.h>
36#include "battery.h"
37
38#define PREFIX "ACPI: "
39
40#define ACPI_AC_CLASS "ac_adapter"
41#define ACPI_AC_DEVICE_NAME "AC Adapter"
42#define ACPI_AC_FILE_STATE "state"
43#define ACPI_AC_NOTIFY_STATUS 0x80
44#define ACPI_AC_STATUS_OFFLINE 0x00
45#define ACPI_AC_STATUS_ONLINE 0x01
46#define ACPI_AC_STATUS_UNKNOWN 0xFF
47
48#define _COMPONENT ACPI_AC_COMPONENT
49ACPI_MODULE_NAME("ac");
50
51MODULE_AUTHOR("Paul Diefenbaugh");
52MODULE_DESCRIPTION("ACPI AC Adapter Driver");
53MODULE_LICENSE("GPL");
54
55static int acpi_ac_add(struct acpi_device *device);
56static int acpi_ac_remove(struct acpi_device *device);
57static void acpi_ac_notify(struct acpi_device *device, u32 event);
58
59static const struct acpi_device_id ac_device_ids[] = {
60 {"ACPI0003", 0},
61 {"", 0},
62};
63MODULE_DEVICE_TABLE(acpi, ac_device_ids);
64
65#ifdef CONFIG_PM_SLEEP
66static int acpi_ac_resume(struct device *dev);
67#endif
68static SIMPLE_DEV_PM_OPS(acpi_ac_pm, NULL, acpi_ac_resume);
69
70static int ac_sleep_before_get_state_ms;
71
72static struct acpi_driver acpi_ac_driver = {
73 .name = "ac",
74 .class = ACPI_AC_CLASS,
75 .ids = ac_device_ids,
76 .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
77 .ops = {
78 .add = acpi_ac_add,
79 .remove = acpi_ac_remove,
80 .notify = acpi_ac_notify,
81 },
82 .drv.pm = &acpi_ac_pm,
83};
84
85struct acpi_ac {
86 struct power_supply charger;
87 struct acpi_device * device;
88 unsigned long long state;
89 struct notifier_block battery_nb;
90};
91
92#define to_acpi_ac(x) container_of(x, struct acpi_ac, charger)
93
94/* --------------------------------------------------------------------------
95 AC Adapter Management
96 -------------------------------------------------------------------------- */
97
98static int acpi_ac_get_state(struct acpi_ac *ac)
99{
100 acpi_status status = AE_OK;
101
102 if (!ac)
103 return -EINVAL;
104
105 status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL,
106 &ac->state);
107 if (ACPI_FAILURE(status)) {
108 ACPI_EXCEPTION((AE_INFO, status,
109 "Error reading AC Adapter state"));
110 ac->state = ACPI_AC_STATUS_UNKNOWN;
111 return -ENODEV;
112 }
113
114 return 0;
115}
116
117/* --------------------------------------------------------------------------
118 sysfs I/F
119 -------------------------------------------------------------------------- */
120static int get_ac_property(struct power_supply *psy,
121 enum power_supply_property psp,
122 union power_supply_propval *val)
123{
124 struct acpi_ac *ac = to_acpi_ac(psy);
125
126 if (!ac)
127 return -ENODEV;
128
129 if (acpi_ac_get_state(ac))
130 return -ENODEV;
131
132 switch (psp) {
133 case POWER_SUPPLY_PROP_ONLINE:
134 val->intval = ac->state;
135 break;
136 default:
137 return -EINVAL;
138 }
139 return 0;
140}
141
142static enum power_supply_property ac_props[] = {
143 POWER_SUPPLY_PROP_ONLINE,
144};
145
146/* --------------------------------------------------------------------------
147 Driver Model
148 -------------------------------------------------------------------------- */
149
150static void acpi_ac_notify(struct acpi_device *device, u32 event)
151{
152 struct acpi_ac *ac = acpi_driver_data(device);
153
154 if (!ac)
155 return;
156
157 switch (event) {
158 default:
159 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
160 "Unsupported event [0x%x]\n", event));
161 case ACPI_AC_NOTIFY_STATUS:
162 case ACPI_NOTIFY_BUS_CHECK:
163 case ACPI_NOTIFY_DEVICE_CHECK:
164 /*
165 * A buggy BIOS may notify AC first and then sleep for
166 * a specific time before doing actual operations in the
167 * EC event handler (_Qxx). This will cause the AC state
168 * reported by the ACPI event to be incorrect, so wait for a
169 * specific time for the EC event handler to make progress.
170 */
171 if (ac_sleep_before_get_state_ms > 0)
172 msleep(ac_sleep_before_get_state_ms);
173
174 acpi_ac_get_state(ac);
175 acpi_bus_generate_netlink_event(device->pnp.device_class,
176 dev_name(&device->dev), event,
177 (u32) ac->state);
178 acpi_notifier_call_chain(device, event, (u32) ac->state);
179 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
180 }
181
182 return;
183}
184
185static int acpi_ac_battery_notify(struct notifier_block *nb,
186 unsigned long action, void *data)
187{
188 struct acpi_ac *ac = container_of(nb, struct acpi_ac, battery_nb);
189 struct acpi_bus_event *event = (struct acpi_bus_event *)data;
190
191 /*
192 * On HP Pavilion dv6-6179er AC status notifications aren't triggered
193 * when adapter is plugged/unplugged. However, battery status
194 * notifcations are triggered when battery starts charging or
195 * discharging. Re-reading AC status triggers lost AC notifications,
196 * if AC status has changed.
197 */
198 if (strcmp(event->device_class, ACPI_BATTERY_CLASS) == 0 &&
199 event->type == ACPI_BATTERY_NOTIFY_STATUS)
200 acpi_ac_get_state(ac);
201
202 return NOTIFY_OK;
203}
204
205static int thinkpad_e530_quirk(const struct dmi_system_id *d)
206{
207 ac_sleep_before_get_state_ms = 1000;
208 return 0;
209}
210
211static struct dmi_system_id ac_dmi_table[] = {
212 {
213 .callback = thinkpad_e530_quirk,
214 .ident = "thinkpad e530",
215 .matches = {
216 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
217 DMI_MATCH(DMI_PRODUCT_NAME, "32597CG"),
218 },
219 },
220 {},
221};
222
223static int acpi_ac_add(struct acpi_device *device)
224{
225 int result = 0;
226 struct acpi_ac *ac = NULL;
227
228
229 if (!device)
230 return -EINVAL;
231
232 ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL);
233 if (!ac)
234 return -ENOMEM;
235
236 ac->device = device;
237 strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME);
238 strcpy(acpi_device_class(device), ACPI_AC_CLASS);
239 device->driver_data = ac;
240
241 result = acpi_ac_get_state(ac);
242 if (result)
243 goto end;
244
245 ac->charger.name = acpi_device_bid(device);
246 ac->charger.type = POWER_SUPPLY_TYPE_MAINS;
247 ac->charger.properties = ac_props;
248 ac->charger.num_properties = ARRAY_SIZE(ac_props);
249 ac->charger.get_property = get_ac_property;
250 result = power_supply_register(&ac->device->dev, &ac->charger);
251 if (result)
252 goto end;
253
254 printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
255 acpi_device_name(device), acpi_device_bid(device),
256 ac->state ? "on-line" : "off-line");
257
258 ac->battery_nb.notifier_call = acpi_ac_battery_notify;
259 register_acpi_notifier(&ac->battery_nb);
260end:
261 if (result)
262 kfree(ac);
263
264 dmi_check_system(ac_dmi_table);
265 return result;
266}
267
268#ifdef CONFIG_PM_SLEEP
269static int acpi_ac_resume(struct device *dev)
270{
271 struct acpi_ac *ac;
272 unsigned old_state;
273
274 if (!dev)
275 return -EINVAL;
276
277 ac = acpi_driver_data(to_acpi_device(dev));
278 if (!ac)
279 return -EINVAL;
280
281 old_state = ac->state;
282 if (acpi_ac_get_state(ac))
283 return 0;
284 if (old_state != ac->state)
285 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
286 return 0;
287}
288#else
289#define acpi_ac_resume NULL
290#endif
291
292static int acpi_ac_remove(struct acpi_device *device)
293{
294 struct acpi_ac *ac = NULL;
295
296
297 if (!device || !acpi_driver_data(device))
298 return -EINVAL;
299
300 ac = acpi_driver_data(device);
301
302 if (ac->charger.dev)
303 power_supply_unregister(&ac->charger);
304 unregister_acpi_notifier(&ac->battery_nb);
305
306 kfree(ac);
307
308 return 0;
309}
310
311static int __init acpi_ac_init(void)
312{
313 int result;
314
315 if (acpi_disabled)
316 return -ENODEV;
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);