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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#ifdef CONFIG_ACPI_PROCFS_POWER
32#include <linux/proc_fs.h>
33#include <linux/seq_file.h>
34#endif
35#include <linux/power_supply.h>
36#include <acpi/acpi_bus.h>
37#include <acpi/acpi_drivers.h>
38
39#define PREFIX "ACPI: "
40
41#define ACPI_AC_CLASS "ac_adapter"
42#define ACPI_AC_DEVICE_NAME "AC Adapter"
43#define ACPI_AC_FILE_STATE "state"
44#define ACPI_AC_NOTIFY_STATUS 0x80
45#define ACPI_AC_STATUS_OFFLINE 0x00
46#define ACPI_AC_STATUS_ONLINE 0x01
47#define ACPI_AC_STATUS_UNKNOWN 0xFF
48
49#define _COMPONENT ACPI_AC_COMPONENT
50ACPI_MODULE_NAME("ac");
51
52MODULE_AUTHOR("Paul Diefenbaugh");
53MODULE_DESCRIPTION("ACPI AC Adapter Driver");
54MODULE_LICENSE("GPL");
55
56#ifdef CONFIG_ACPI_PROCFS_POWER
57extern struct proc_dir_entry *acpi_lock_ac_dir(void);
58extern void *acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir);
59static int acpi_ac_open_fs(struct inode *inode, struct file *file);
60#endif
61
62static int acpi_ac_add(struct acpi_device *device);
63static int acpi_ac_remove(struct acpi_device *device, int type);
64static int acpi_ac_resume(struct acpi_device *device);
65static void acpi_ac_notify(struct acpi_device *device, u32 event);
66
67static const struct acpi_device_id ac_device_ids[] = {
68 {"ACPI0003", 0},
69 {"", 0},
70};
71MODULE_DEVICE_TABLE(acpi, ac_device_ids);
72
73static struct acpi_driver acpi_ac_driver = {
74 .name = "ac",
75 .class = ACPI_AC_CLASS,
76 .ids = ac_device_ids,
77 .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
78 .ops = {
79 .add = acpi_ac_add,
80 .remove = acpi_ac_remove,
81 .resume = acpi_ac_resume,
82 .notify = acpi_ac_notify,
83 },
84};
85
86struct acpi_ac {
87 struct power_supply charger;
88 struct acpi_device * device;
89 unsigned long long state;
90};
91
92#define to_acpi_ac(x) container_of(x, struct acpi_ac, charger)
93
94#ifdef CONFIG_ACPI_PROCFS_POWER
95static const struct file_operations acpi_ac_fops = {
96 .owner = THIS_MODULE,
97 .open = acpi_ac_open_fs,
98 .read = seq_read,
99 .llseek = seq_lseek,
100 .release = single_release,
101};
102#endif
103
104/* --------------------------------------------------------------------------
105 AC Adapter Management
106 -------------------------------------------------------------------------- */
107
108static int acpi_ac_get_state(struct acpi_ac *ac)
109{
110 acpi_status status = AE_OK;
111
112
113 if (!ac)
114 return -EINVAL;
115
116 status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL, &ac->state);
117 if (ACPI_FAILURE(status)) {
118 ACPI_EXCEPTION((AE_INFO, status, "Error reading AC Adapter state"));
119 ac->state = ACPI_AC_STATUS_UNKNOWN;
120 return -ENODEV;
121 }
122
123 return 0;
124}
125
126/* --------------------------------------------------------------------------
127 sysfs I/F
128 -------------------------------------------------------------------------- */
129static int get_ac_property(struct power_supply *psy,
130 enum power_supply_property psp,
131 union power_supply_propval *val)
132{
133 struct acpi_ac *ac = to_acpi_ac(psy);
134
135 if (!ac)
136 return -ENODEV;
137
138 if (acpi_ac_get_state(ac))
139 return -ENODEV;
140
141 switch (psp) {
142 case POWER_SUPPLY_PROP_ONLINE:
143 val->intval = ac->state;
144 break;
145 default:
146 return -EINVAL;
147 }
148 return 0;
149}
150
151static enum power_supply_property ac_props[] = {
152 POWER_SUPPLY_PROP_ONLINE,
153};
154
155#ifdef CONFIG_ACPI_PROCFS_POWER
156/* --------------------------------------------------------------------------
157 FS Interface (/proc)
158 -------------------------------------------------------------------------- */
159
160static struct proc_dir_entry *acpi_ac_dir;
161
162static int acpi_ac_seq_show(struct seq_file *seq, void *offset)
163{
164 struct acpi_ac *ac = seq->private;
165
166
167 if (!ac)
168 return 0;
169
170 if (acpi_ac_get_state(ac)) {
171 seq_puts(seq, "ERROR: Unable to read AC Adapter state\n");
172 return 0;
173 }
174
175 seq_puts(seq, "state: ");
176 switch (ac->state) {
177 case ACPI_AC_STATUS_OFFLINE:
178 seq_puts(seq, "off-line\n");
179 break;
180 case ACPI_AC_STATUS_ONLINE:
181 seq_puts(seq, "on-line\n");
182 break;
183 default:
184 seq_puts(seq, "unknown\n");
185 break;
186 }
187
188 return 0;
189}
190
191static int acpi_ac_open_fs(struct inode *inode, struct file *file)
192{
193 return single_open(file, acpi_ac_seq_show, PDE(inode)->data);
194}
195
196static int acpi_ac_add_fs(struct acpi_device *device)
197{
198 struct proc_dir_entry *entry = NULL;
199
200 printk(KERN_WARNING PREFIX "Deprecated procfs I/F for AC is loaded,"
201 " please retry with CONFIG_ACPI_PROCFS_POWER cleared\n");
202 if (!acpi_device_dir(device)) {
203 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
204 acpi_ac_dir);
205 if (!acpi_device_dir(device))
206 return -ENODEV;
207 }
208
209 /* 'state' [R] */
210 entry = proc_create_data(ACPI_AC_FILE_STATE,
211 S_IRUGO, acpi_device_dir(device),
212 &acpi_ac_fops, acpi_driver_data(device));
213 if (!entry)
214 return -ENODEV;
215 return 0;
216}
217
218static int acpi_ac_remove_fs(struct acpi_device *device)
219{
220
221 if (acpi_device_dir(device)) {
222 remove_proc_entry(ACPI_AC_FILE_STATE, acpi_device_dir(device));
223
224 remove_proc_entry(acpi_device_bid(device), acpi_ac_dir);
225 acpi_device_dir(device) = NULL;
226 }
227
228 return 0;
229}
230#endif
231
232/* --------------------------------------------------------------------------
233 Driver Model
234 -------------------------------------------------------------------------- */
235
236static void acpi_ac_notify(struct acpi_device *device, u32 event)
237{
238 struct acpi_ac *ac = acpi_driver_data(device);
239
240
241 if (!ac)
242 return;
243
244 switch (event) {
245 default:
246 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
247 "Unsupported event [0x%x]\n", event));
248 case ACPI_AC_NOTIFY_STATUS:
249 case ACPI_NOTIFY_BUS_CHECK:
250 case ACPI_NOTIFY_DEVICE_CHECK:
251 acpi_ac_get_state(ac);
252 acpi_bus_generate_proc_event(device, event, (u32) ac->state);
253 acpi_bus_generate_netlink_event(device->pnp.device_class,
254 dev_name(&device->dev), event,
255 (u32) ac->state);
256 acpi_notifier_call_chain(device, event, (u32) ac->state);
257 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
258 }
259
260 return;
261}
262
263static int acpi_ac_add(struct acpi_device *device)
264{
265 int result = 0;
266 struct acpi_ac *ac = NULL;
267
268
269 if (!device)
270 return -EINVAL;
271
272 ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL);
273 if (!ac)
274 return -ENOMEM;
275
276 ac->device = device;
277 strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME);
278 strcpy(acpi_device_class(device), ACPI_AC_CLASS);
279 device->driver_data = ac;
280
281 result = acpi_ac_get_state(ac);
282 if (result)
283 goto end;
284
285#ifdef CONFIG_ACPI_PROCFS_POWER
286 result = acpi_ac_add_fs(device);
287#endif
288 if (result)
289 goto end;
290 ac->charger.name = acpi_device_bid(device);
291 ac->charger.type = POWER_SUPPLY_TYPE_MAINS;
292 ac->charger.properties = ac_props;
293 ac->charger.num_properties = ARRAY_SIZE(ac_props);
294 ac->charger.get_property = get_ac_property;
295 power_supply_register(&ac->device->dev, &ac->charger);
296
297 printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
298 acpi_device_name(device), acpi_device_bid(device),
299 ac->state ? "on-line" : "off-line");
300
301 end:
302 if (result) {
303#ifdef CONFIG_ACPI_PROCFS_POWER
304 acpi_ac_remove_fs(device);
305#endif
306 kfree(ac);
307 }
308
309 return result;
310}
311
312static int acpi_ac_resume(struct acpi_device *device)
313{
314 struct acpi_ac *ac;
315 unsigned old_state;
316 if (!device || !acpi_driver_data(device))
317 return -EINVAL;
318 ac = acpi_driver_data(device);
319 old_state = ac->state;
320 if (acpi_ac_get_state(ac))
321 return 0;
322 if (old_state != ac->state)
323 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
324 return 0;
325}
326
327static int acpi_ac_remove(struct acpi_device *device, int type)
328{
329 struct acpi_ac *ac = NULL;
330
331
332 if (!device || !acpi_driver_data(device))
333 return -EINVAL;
334
335 ac = acpi_driver_data(device);
336
337 if (ac->charger.dev)
338 power_supply_unregister(&ac->charger);
339#ifdef CONFIG_ACPI_PROCFS_POWER
340 acpi_ac_remove_fs(device);
341#endif
342
343 kfree(ac);
344
345 return 0;
346}
347
348static int __init acpi_ac_init(void)
349{
350 int result;
351
352 if (acpi_disabled)
353 return -ENODEV;
354
355#ifdef CONFIG_ACPI_PROCFS_POWER
356 acpi_ac_dir = acpi_lock_ac_dir();
357 if (!acpi_ac_dir)
358 return -ENODEV;
359#endif
360
361 result = acpi_bus_register_driver(&acpi_ac_driver);
362 if (result < 0) {
363#ifdef CONFIG_ACPI_PROCFS_POWER
364 acpi_unlock_ac_dir(acpi_ac_dir);
365#endif
366 return -ENODEV;
367 }
368
369 return 0;
370}
371
372static void __exit acpi_ac_exit(void)
373{
374
375 acpi_bus_unregister_driver(&acpi_ac_driver);
376
377#ifdef CONFIG_ACPI_PROCFS_POWER
378 acpi_unlock_ac_dir(acpi_ac_dir);
379#endif
380
381 return;
382}
383
384module_init(acpi_ac_init);
385module_exit(acpi_ac_exit);