Merge tag 'kgdb-6.7-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/danielt...
[linux-2.6-microblaze.git] / drivers / acpi / ac.c
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
32 MODULE_AUTHOR("Paul Diefenbaugh");
33 MODULE_DESCRIPTION("ACPI AC Adapter Driver");
34 MODULE_LICENSE("GPL");
35
36 static int acpi_ac_probe(struct platform_device *pdev);
37 static void acpi_ac_remove(struct platform_device *pdev);
38
39 static void acpi_ac_notify(acpi_handle handle, u32 event, void *data);
40
41 static const struct acpi_device_id ac_device_ids[] = {
42         {"ACPI0003", 0},
43         {"", 0},
44 };
45 MODULE_DEVICE_TABLE(acpi, ac_device_ids);
46
47 #ifdef CONFIG_PM_SLEEP
48 static int acpi_ac_resume(struct device *dev);
49 #endif
50 static SIMPLE_DEV_PM_OPS(acpi_ac_pm, NULL, acpi_ac_resume);
51
52 static int ac_sleep_before_get_state_ms;
53 static int ac_only;
54
55 struct 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 */
66 static 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 */
92 static 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
115 static enum power_supply_property ac_props[] = {
116         POWER_SUPPLY_PROP_ONLINE,
117 };
118
119 /* Driver Model */
120 static 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                 kobject_uevent(&ac->charger->dev.kobj, KOBJ_CHANGE);
149         }
150 }
151
152 static 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
172 static 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
178 static 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 */
185 static 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
204 static 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         strcpy(acpi_device_name(adev), ACPI_AC_DEVICE_NAME);
217         strcpy(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
252 err_unregister:
253         power_supply_unregister(ac->charger);
254         unregister_acpi_notifier(&ac->battery_nb);
255 err_release_ac:
256         kfree(ac);
257
258         return result;
259 }
260
261 #ifdef CONFIG_PM_SLEEP
262 static 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                 kobject_uevent(&ac->charger->dev.kobj, KOBJ_CHANGE);
272
273         return 0;
274 }
275 #else
276 #define acpi_ac_resume NULL
277 #endif
278
279 static 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
291 static struct platform_driver acpi_ac_driver = {
292         .probe = acpi_ac_probe,
293         .remove_new = acpi_ac_remove,
294         .driver = {
295                 .name = "ac",
296                 .acpi_match_table = ac_device_ids,
297                 .pm = &acpi_ac_pm,
298         },
299 };
300
301 static 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
320 static void __exit acpi_ac_exit(void)
321 {
322         platform_driver_unregister(&acpi_ac_driver);
323 }
324 module_init(acpi_ac_init);
325 module_exit(acpi_ac_exit);