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
36 static int acpi_ac_add(struct acpi_device *device);
37 static int acpi_ac_remove(struct acpi_device *device);
38 static void acpi_ac_notify(struct acpi_device *device, u32 event);
39
40 struct acpi_ac_bl {
41 const char *hid;
42 int hrv;
43 };
44
45 static const struct acpi_device_id ac_device_ids[] = {
46 {"ACPI0003", 0},
47 {"", 0},
48 };
49 MODULE_DEVICE_TABLE(acpi, ac_device_ids);
50
51 /* Lists of PMIC ACPI HIDs with an (often better) native charger driver */
52 static const struct acpi_ac_bl acpi_ac_blacklist[] = {
53 { "INT33F4", -1 }, /* X-Powers AXP288 PMIC */
54 { "INT34D3", 3 }, /* Intel Cherrytrail Whiskey Cove PMIC */
55 };
56
57 #ifdef CONFIG_PM_SLEEP
58 static int acpi_ac_resume(struct device *dev);
59 #endif
60 static SIMPLE_DEV_PM_OPS(acpi_ac_pm, NULL, acpi_ac_resume);
61
62 static int ac_sleep_before_get_state_ms;
63 static int ac_check_pmic = 1;
64 static int ac_only;
65
66 static struct acpi_driver acpi_ac_driver = {
67 .name = "ac",
68 .class = ACPI_AC_CLASS,
69 .ids = ac_device_ids,
70 .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
71 .ops = {
72 .add = acpi_ac_add,
73 .remove = acpi_ac_remove,
74 .notify = acpi_ac_notify,
75 },
76 .drv.pm = &acpi_ac_pm,
77 };
78
79 struct acpi_ac {
80 struct power_supply *charger;
81 struct power_supply_desc charger_desc;
82 struct acpi_device *device;
83 unsigned long long state;
84 struct notifier_block battery_nb;
85 };
86
87 #define to_acpi_ac(x) power_supply_get_drvdata(x)
88
89 /* AC Adapter Management */
acpi_ac_get_state(struct acpi_ac * ac)90 static int acpi_ac_get_state(struct acpi_ac *ac)
91 {
92 acpi_status status = AE_OK;
93
94 if (!ac)
95 return -EINVAL;
96
97 if (ac_only) {
98 ac->state = 1;
99 return 0;
100 }
101
102 status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL,
103 &ac->state);
104 if (ACPI_FAILURE(status)) {
105 acpi_handle_info(ac->device->handle,
106 "Error reading AC Adapter state: %s\n",
107 acpi_format_exception(status));
108 ac->state = ACPI_AC_STATUS_UNKNOWN;
109 return -ENODEV;
110 }
111
112 return 0;
113 }
114
115 /* sysfs I/F */
get_ac_property(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)116 static int get_ac_property(struct power_supply *psy,
117 enum power_supply_property psp,
118 union power_supply_propval *val)
119 {
120 struct acpi_ac *ac = to_acpi_ac(psy);
121
122 if (!ac)
123 return -ENODEV;
124
125 if (acpi_ac_get_state(ac))
126 return -ENODEV;
127
128 switch (psp) {
129 case POWER_SUPPLY_PROP_ONLINE:
130 val->intval = ac->state;
131 break;
132 default:
133 return -EINVAL;
134 }
135 return 0;
136 }
137
138 static enum power_supply_property ac_props[] = {
139 POWER_SUPPLY_PROP_ONLINE,
140 };
141
142 /* Driver Model */
acpi_ac_notify(struct acpi_device * device,u32 event)143 static void acpi_ac_notify(struct acpi_device *device, u32 event)
144 {
145 struct acpi_ac *ac = acpi_driver_data(device);
146
147 if (!ac)
148 return;
149
150 switch (event) {
151 default:
152 acpi_handle_debug(device->handle, "Unsupported event [0x%x]\n",
153 event);
154 fallthrough;
155 case ACPI_AC_NOTIFY_STATUS:
156 case ACPI_NOTIFY_BUS_CHECK:
157 case ACPI_NOTIFY_DEVICE_CHECK:
158 /*
159 * A buggy BIOS may notify AC first and then sleep for
160 * a specific time before doing actual operations in the
161 * EC event handler (_Qxx). This will cause the AC state
162 * reported by the ACPI event to be incorrect, so wait for a
163 * specific time for the EC event handler to make progress.
164 */
165 if (ac_sleep_before_get_state_ms > 0)
166 msleep(ac_sleep_before_get_state_ms);
167
168 acpi_ac_get_state(ac);
169 acpi_bus_generate_netlink_event(device->pnp.device_class,
170 dev_name(&device->dev), event,
171 (u32) ac->state);
172 acpi_notifier_call_chain(device, event, (u32) ac->state);
173 kobject_uevent(&ac->charger->dev.kobj, KOBJ_CHANGE);
174 }
175 }
176
acpi_ac_battery_notify(struct notifier_block * nb,unsigned long action,void * data)177 static int acpi_ac_battery_notify(struct notifier_block *nb,
178 unsigned long action, void *data)
179 {
180 struct acpi_ac *ac = container_of(nb, struct acpi_ac, battery_nb);
181 struct acpi_bus_event *event = (struct acpi_bus_event *)data;
182
183 /*
184 * On HP Pavilion dv6-6179er AC status notifications aren't triggered
185 * when adapter is plugged/unplugged. However, battery status
186 * notifications are triggered when battery starts charging or
187 * discharging. Re-reading AC status triggers lost AC notifications,
188 * if AC status has changed.
189 */
190 if (strcmp(event->device_class, ACPI_BATTERY_CLASS) == 0 &&
191 event->type == ACPI_BATTERY_NOTIFY_STATUS)
192 acpi_ac_get_state(ac);
193
194 return NOTIFY_OK;
195 }
196
thinkpad_e530_quirk(const struct dmi_system_id * d)197 static int __init thinkpad_e530_quirk(const struct dmi_system_id *d)
198 {
199 ac_sleep_before_get_state_ms = 1000;
200 return 0;
201 }
202
ac_do_not_check_pmic_quirk(const struct dmi_system_id * d)203 static int __init ac_do_not_check_pmic_quirk(const struct dmi_system_id *d)
204 {
205 ac_check_pmic = 0;
206 return 0;
207 }
208
ac_only_quirk(const struct dmi_system_id * d)209 static int __init ac_only_quirk(const struct dmi_system_id *d)
210 {
211 ac_only = 1;
212 return 0;
213 }
214
215 /* Please keep this list alphabetically sorted */
216 static const struct dmi_system_id ac_dmi_table[] __initconst = {
217 {
218 /* ECS EF20EA, AXP288 PMIC but uses separate fuel-gauge */
219 .callback = ac_do_not_check_pmic_quirk,
220 .matches = {
221 DMI_MATCH(DMI_PRODUCT_NAME, "EF20EA"),
222 },
223 },
224 {
225 /* Kodlix GK45 returning incorrect state */
226 .callback = ac_only_quirk,
227 .matches = {
228 DMI_MATCH(DMI_PRODUCT_NAME, "GK45"),
229 },
230 },
231 {
232 /* Lenovo Ideapad Miix 320, AXP288 PMIC, separate fuel-gauge */
233 .callback = ac_do_not_check_pmic_quirk,
234 .matches = {
235 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
236 DMI_MATCH(DMI_PRODUCT_NAME, "80XF"),
237 DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo MIIX 320-10ICR"),
238 },
239 },
240 {
241 /* Lenovo Thinkpad e530, see comment in acpi_ac_notify() */
242 .callback = thinkpad_e530_quirk,
243 .matches = {
244 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
245 DMI_MATCH(DMI_PRODUCT_NAME, "32597CG"),
246 },
247 },
248 {},
249 };
250
acpi_ac_add(struct acpi_device * device)251 static int acpi_ac_add(struct acpi_device *device)
252 {
253 struct power_supply_config psy_cfg = {};
254 int result = 0;
255 struct acpi_ac *ac = NULL;
256
257
258 if (!device)
259 return -EINVAL;
260
261 ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL);
262 if (!ac)
263 return -ENOMEM;
264
265 ac->device = device;
266 strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME);
267 strcpy(acpi_device_class(device), ACPI_AC_CLASS);
268 device->driver_data = ac;
269
270 result = acpi_ac_get_state(ac);
271 if (result)
272 goto end;
273
274 psy_cfg.drv_data = ac;
275
276 ac->charger_desc.name = acpi_device_bid(device);
277 ac->charger_desc.type = POWER_SUPPLY_TYPE_MAINS;
278 ac->charger_desc.properties = ac_props;
279 ac->charger_desc.num_properties = ARRAY_SIZE(ac_props);
280 ac->charger_desc.get_property = get_ac_property;
281 ac->charger = power_supply_register(&ac->device->dev,
282 &ac->charger_desc, &psy_cfg);
283 if (IS_ERR(ac->charger)) {
284 result = PTR_ERR(ac->charger);
285 goto end;
286 }
287
288 pr_info("%s [%s] (%s)\n", acpi_device_name(device),
289 acpi_device_bid(device), ac->state ? "on-line" : "off-line");
290
291 ac->battery_nb.notifier_call = acpi_ac_battery_notify;
292 register_acpi_notifier(&ac->battery_nb);
293 end:
294 if (result)
295 kfree(ac);
296
297 return result;
298 }
299
300 #ifdef CONFIG_PM_SLEEP
acpi_ac_resume(struct device * dev)301 static int acpi_ac_resume(struct device *dev)
302 {
303 struct acpi_ac *ac;
304 unsigned int old_state;
305
306 if (!dev)
307 return -EINVAL;
308
309 ac = acpi_driver_data(to_acpi_device(dev));
310 if (!ac)
311 return -EINVAL;
312
313 old_state = ac->state;
314 if (acpi_ac_get_state(ac))
315 return 0;
316 if (old_state != ac->state)
317 kobject_uevent(&ac->charger->dev.kobj, KOBJ_CHANGE);
318 return 0;
319 }
320 #else
321 #define acpi_ac_resume NULL
322 #endif
323
acpi_ac_remove(struct acpi_device * device)324 static int acpi_ac_remove(struct acpi_device *device)
325 {
326 struct acpi_ac *ac = NULL;
327
328
329 if (!device || !acpi_driver_data(device))
330 return -EINVAL;
331
332 ac = acpi_driver_data(device);
333
334 power_supply_unregister(ac->charger);
335 unregister_acpi_notifier(&ac->battery_nb);
336
337 kfree(ac);
338
339 return 0;
340 }
341
acpi_ac_init(void)342 static int __init acpi_ac_init(void)
343 {
344 unsigned int i;
345 int result;
346
347 if (acpi_disabled)
348 return -ENODEV;
349
350 dmi_check_system(ac_dmi_table);
351
352 if (ac_check_pmic) {
353 for (i = 0; i < ARRAY_SIZE(acpi_ac_blacklist); i++)
354 if (acpi_dev_present(acpi_ac_blacklist[i].hid, "1",
355 acpi_ac_blacklist[i].hrv)) {
356 pr_info("found native %s PMIC, not loading\n",
357 acpi_ac_blacklist[i].hid);
358 return -ENODEV;
359 }
360 }
361
362 result = acpi_bus_register_driver(&acpi_ac_driver);
363 if (result < 0)
364 return -ENODEV;
365
366 return 0;
367 }
368
acpi_ac_exit(void)369 static void __exit acpi_ac_exit(void)
370 {
371 acpi_bus_unregister_driver(&acpi_ac_driver);
372 }
373 module_init(acpi_ac_init);
374 module_exit(acpi_ac_exit);
375