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
31 MODULE_AUTHOR("Paul Diefenbaugh");
32 MODULE_DESCRIPTION("ACPI AC Adapter Driver");
33 MODULE_LICENSE("GPL");
34
35 static int acpi_ac_add(struct acpi_device *device);
36 static void acpi_ac_remove(struct acpi_device *device);
37 static void acpi_ac_notify(acpi_handle handle, u32 event, void *data);
38
39 static const struct acpi_device_id ac_device_ids[] = {
40 {"ACPI0003", 0},
41 {"", 0},
42 };
43 MODULE_DEVICE_TABLE(acpi, ac_device_ids);
44
45 #ifdef CONFIG_PM_SLEEP
46 static int acpi_ac_resume(struct device *dev);
47 #endif
48 static SIMPLE_DEV_PM_OPS(acpi_ac_pm, NULL, acpi_ac_resume);
49
50 static int ac_sleep_before_get_state_ms;
51 static int ac_only;
52
53 static struct acpi_driver acpi_ac_driver = {
54 .name = "ac",
55 .class = ACPI_AC_CLASS,
56 .ids = ac_device_ids,
57 .ops = {
58 .add = acpi_ac_add,
59 .remove = acpi_ac_remove,
60 },
61 .drv.pm = &acpi_ac_pm,
62 };
63
64 struct acpi_ac {
65 struct power_supply *charger;
66 struct power_supply_desc charger_desc;
67 struct acpi_device *device;
68 unsigned long long state;
69 struct notifier_block battery_nb;
70 };
71
72 #define to_acpi_ac(x) power_supply_get_drvdata(x)
73
74 /* AC Adapter Management */
acpi_ac_get_state(struct acpi_ac * ac)75 static int acpi_ac_get_state(struct acpi_ac *ac)
76 {
77 acpi_status status = AE_OK;
78
79 if (!ac)
80 return -EINVAL;
81
82 if (ac_only) {
83 ac->state = 1;
84 return 0;
85 }
86
87 status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL,
88 &ac->state);
89 if (ACPI_FAILURE(status)) {
90 acpi_handle_info(ac->device->handle,
91 "Error reading AC Adapter state: %s\n",
92 acpi_format_exception(status));
93 ac->state = ACPI_AC_STATUS_UNKNOWN;
94 return -ENODEV;
95 }
96
97 return 0;
98 }
99
100 /* sysfs I/F */
get_ac_property(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)101 static int get_ac_property(struct power_supply *psy,
102 enum power_supply_property psp,
103 union power_supply_propval *val)
104 {
105 struct acpi_ac *ac = to_acpi_ac(psy);
106
107 if (!ac)
108 return -ENODEV;
109
110 if (acpi_ac_get_state(ac))
111 return -ENODEV;
112
113 switch (psp) {
114 case POWER_SUPPLY_PROP_ONLINE:
115 val->intval = ac->state;
116 break;
117 default:
118 return -EINVAL;
119 }
120
121 return 0;
122 }
123
124 static enum power_supply_property ac_props[] = {
125 POWER_SUPPLY_PROP_ONLINE,
126 };
127
128 /* Driver Model */
acpi_ac_notify(acpi_handle handle,u32 event,void * data)129 static void acpi_ac_notify(acpi_handle handle, u32 event, void *data)
130 {
131 struct acpi_device *device = data;
132 struct acpi_ac *ac = acpi_driver_data(device);
133
134 if (!ac)
135 return;
136
137 switch (event) {
138 default:
139 acpi_handle_debug(device->handle, "Unsupported event [0x%x]\n",
140 event);
141 fallthrough;
142 case ACPI_AC_NOTIFY_STATUS:
143 case ACPI_NOTIFY_BUS_CHECK:
144 case ACPI_NOTIFY_DEVICE_CHECK:
145 /*
146 * A buggy BIOS may notify AC first and then sleep for
147 * a specific time before doing actual operations in the
148 * EC event handler (_Qxx). This will cause the AC state
149 * reported by the ACPI event to be incorrect, so wait for a
150 * specific time for the EC event handler to make progress.
151 */
152 if (ac_sleep_before_get_state_ms > 0)
153 msleep(ac_sleep_before_get_state_ms);
154
155 acpi_ac_get_state(ac);
156 acpi_bus_generate_netlink_event(device->pnp.device_class,
157 dev_name(&device->dev), event,
158 (u32) ac->state);
159 acpi_notifier_call_chain(device, event, (u32) ac->state);
160 kobject_uevent(&ac->charger->dev.kobj, KOBJ_CHANGE);
161 }
162 }
163
acpi_ac_battery_notify(struct notifier_block * nb,unsigned long action,void * data)164 static int acpi_ac_battery_notify(struct notifier_block *nb,
165 unsigned long action, void *data)
166 {
167 struct acpi_ac *ac = container_of(nb, struct acpi_ac, battery_nb);
168 struct acpi_bus_event *event = (struct acpi_bus_event *)data;
169
170 /*
171 * On HP Pavilion dv6-6179er AC status notifications aren't triggered
172 * when adapter is plugged/unplugged. However, battery status
173 * notifications are triggered when battery starts charging or
174 * discharging. Re-reading AC status triggers lost AC notifications,
175 * if AC status has changed.
176 */
177 if (strcmp(event->device_class, ACPI_BATTERY_CLASS) == 0 &&
178 event->type == ACPI_BATTERY_NOTIFY_STATUS)
179 acpi_ac_get_state(ac);
180
181 return NOTIFY_OK;
182 }
183
thinkpad_e530_quirk(const struct dmi_system_id * d)184 static int __init thinkpad_e530_quirk(const struct dmi_system_id *d)
185 {
186 ac_sleep_before_get_state_ms = 1000;
187 return 0;
188 }
189
ac_only_quirk(const struct dmi_system_id * d)190 static int __init ac_only_quirk(const struct dmi_system_id *d)
191 {
192 ac_only = 1;
193 return 0;
194 }
195
196 /* Please keep this list alphabetically sorted */
197 static const struct dmi_system_id ac_dmi_table[] __initconst = {
198 {
199 /* Kodlix GK45 returning incorrect state */
200 .callback = ac_only_quirk,
201 .matches = {
202 DMI_MATCH(DMI_PRODUCT_NAME, "GK45"),
203 },
204 },
205 {
206 /* Lenovo Thinkpad e530, see comment in acpi_ac_notify() */
207 .callback = thinkpad_e530_quirk,
208 .matches = {
209 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
210 DMI_MATCH(DMI_PRODUCT_NAME, "32597CG"),
211 },
212 },
213 {},
214 };
215
acpi_ac_add(struct acpi_device * device)216 static int acpi_ac_add(struct acpi_device *device)
217 {
218 struct power_supply_config psy_cfg = {};
219 int result = 0;
220 struct acpi_ac *ac = NULL;
221
222
223 if (!device)
224 return -EINVAL;
225
226 ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL);
227 if (!ac)
228 return -ENOMEM;
229
230 ac->device = device;
231 strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME);
232 strcpy(acpi_device_class(device), ACPI_AC_CLASS);
233 device->driver_data = ac;
234
235 result = acpi_ac_get_state(ac);
236 if (result)
237 goto err_release_ac;
238
239 psy_cfg.drv_data = ac;
240
241 ac->charger_desc.name = acpi_device_bid(device);
242 ac->charger_desc.type = POWER_SUPPLY_TYPE_MAINS;
243 ac->charger_desc.properties = ac_props;
244 ac->charger_desc.num_properties = ARRAY_SIZE(ac_props);
245 ac->charger_desc.get_property = get_ac_property;
246 ac->charger = power_supply_register(&ac->device->dev,
247 &ac->charger_desc, &psy_cfg);
248 if (IS_ERR(ac->charger)) {
249 result = PTR_ERR(ac->charger);
250 goto err_release_ac;
251 }
252
253 pr_info("%s [%s] (%s)\n", acpi_device_name(device),
254 acpi_device_bid(device), ac->state ? "on-line" : "off-line");
255
256 ac->battery_nb.notifier_call = acpi_ac_battery_notify;
257 register_acpi_notifier(&ac->battery_nb);
258
259 result = acpi_dev_install_notify_handler(device, ACPI_ALL_NOTIFY,
260 acpi_ac_notify);
261 if (result)
262 goto err_unregister;
263
264 return 0;
265
266 err_unregister:
267 power_supply_unregister(ac->charger);
268 unregister_acpi_notifier(&ac->battery_nb);
269 err_release_ac:
270 kfree(ac);
271
272 return result;
273 }
274
275 #ifdef CONFIG_PM_SLEEP
acpi_ac_resume(struct device * dev)276 static int acpi_ac_resume(struct device *dev)
277 {
278 struct acpi_ac *ac;
279 unsigned int old_state;
280
281 if (!dev)
282 return -EINVAL;
283
284 ac = acpi_driver_data(to_acpi_device(dev));
285 if (!ac)
286 return -EINVAL;
287
288 old_state = ac->state;
289 if (acpi_ac_get_state(ac))
290 return 0;
291 if (old_state != ac->state)
292 kobject_uevent(&ac->charger->dev.kobj, KOBJ_CHANGE);
293
294 return 0;
295 }
296 #else
297 #define acpi_ac_resume NULL
298 #endif
299
acpi_ac_remove(struct acpi_device * device)300 static void acpi_ac_remove(struct acpi_device *device)
301 {
302 struct acpi_ac *ac = NULL;
303
304 if (!device || !acpi_driver_data(device))
305 return;
306
307 ac = acpi_driver_data(device);
308
309 acpi_dev_remove_notify_handler(device, ACPI_ALL_NOTIFY,
310 acpi_ac_notify);
311 power_supply_unregister(ac->charger);
312 unregister_acpi_notifier(&ac->battery_nb);
313
314 kfree(ac);
315 }
316
acpi_ac_init(void)317 static int __init acpi_ac_init(void)
318 {
319 int result;
320
321 if (acpi_disabled)
322 return -ENODEV;
323
324 if (acpi_quirk_skip_acpi_ac_and_battery())
325 return -ENODEV;
326
327 dmi_check_system(ac_dmi_table);
328
329 result = acpi_bus_register_driver(&acpi_ac_driver);
330 if (result < 0)
331 return -ENODEV;
332
333 return 0;
334 }
335
acpi_ac_exit(void)336 static void __exit acpi_ac_exit(void)
337 {
338 acpi_bus_unregister_driver(&acpi_ac_driver);
339 }
340 module_init(acpi_ac_init);
341 module_exit(acpi_ac_exit);
342