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