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 #include <linux/kernel.h>
10 #include <linux/module.h>
11 #include <linux/slab.h>
12 #include <linux/init.h>
13 #include <linux/types.h>
14 #include <linux/dmi.h>
15 #include <linux/delay.h>
16 #include <linux/platform_device.h>
17 #include <linux/power_supply.h>
18 #include <linux/acpi.h>
19 #include <acpi/battery.h>
20
21 #define PREFIX "ACPI: "
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 #define _COMPONENT ACPI_AC_COMPONENT
32 ACPI_MODULE_NAME("ac");
33
34 MODULE_AUTHOR("Paul Diefenbaugh");
35 MODULE_DESCRIPTION("ACPI AC Adapter Driver");
36 MODULE_LICENSE("GPL");
37
38
39 static int acpi_ac_add(struct acpi_device *device);
40 static int acpi_ac_remove(struct acpi_device *device);
41 static void acpi_ac_notify(struct acpi_device *device, u32 event);
42
43 struct acpi_ac_bl {
44 const char *hid;
45 int hrv;
46 };
47
48 static const struct acpi_device_id ac_device_ids[] = {
49 {"ACPI0003", 0},
50 {"", 0},
51 };
52 MODULE_DEVICE_TABLE(acpi, ac_device_ids);
53
54 /* Lists of PMIC ACPI HIDs with an (often better) native charger driver */
55 static const struct acpi_ac_bl acpi_ac_blacklist[] = {
56 { "INT33F4", -1 }, /* X-Powers AXP288 PMIC */
57 { "INT34D3", 3 }, /* Intel Cherrytrail Whiskey Cove PMIC */
58 };
59
60 #ifdef CONFIG_PM_SLEEP
61 static int acpi_ac_resume(struct device *dev);
62 #endif
63 static SIMPLE_DEV_PM_OPS(acpi_ac_pm, NULL, acpi_ac_resume);
64
65 static int ac_sleep_before_get_state_ms;
66 static int ac_check_pmic = 1;
67 static int ac_only;
68
69 static struct acpi_driver acpi_ac_driver = {
70 .name = "ac",
71 .class = ACPI_AC_CLASS,
72 .ids = ac_device_ids,
73 .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
74 .ops = {
75 .add = acpi_ac_add,
76 .remove = acpi_ac_remove,
77 .notify = acpi_ac_notify,
78 },
79 .drv.pm = &acpi_ac_pm,
80 };
81
82 struct acpi_ac {
83 struct power_supply *charger;
84 struct power_supply_desc charger_desc;
85 struct acpi_device * device;
86 unsigned long long state;
87 struct notifier_block battery_nb;
88 };
89
90 #define to_acpi_ac(x) power_supply_get_drvdata(x)
91
92 /* --------------------------------------------------------------------------
93 AC Adapter Management
94 -------------------------------------------------------------------------- */
95
acpi_ac_get_state(struct acpi_ac *ac)96 static int acpi_ac_get_state(struct acpi_ac *ac)
97 {
98 acpi_status status = AE_OK;
99
100 if (!ac)
101 return -EINVAL;
102
103 if (ac_only) {
104 ac->state = 1;
105 return 0;
106 }
107
108 status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL,
109 &ac->state);
110 if (ACPI_FAILURE(status)) {
111 ACPI_EXCEPTION((AE_INFO, status,
112 "Error reading AC Adapter state"));
113 ac->state = ACPI_AC_STATUS_UNKNOWN;
114 return -ENODEV;
115 }
116
117 return 0;
118 }
119
120 /* --------------------------------------------------------------------------
121 sysfs I/F
122 -------------------------------------------------------------------------- */
get_ac_property(struct power_supply *psy, enum power_supply_property psp, union power_supply_propval *val)123 static int get_ac_property(struct power_supply *psy,
124 enum power_supply_property psp,
125 union power_supply_propval *val)
126 {
127 struct acpi_ac *ac = to_acpi_ac(psy);
128
129 if (!ac)
130 return -ENODEV;
131
132 if (acpi_ac_get_state(ac))
133 return -ENODEV;
134
135 switch (psp) {
136 case POWER_SUPPLY_PROP_ONLINE:
137 val->intval = ac->state;
138 break;
139 default:
140 return -EINVAL;
141 }
142 return 0;
143 }
144
145 static enum power_supply_property ac_props[] = {
146 POWER_SUPPLY_PROP_ONLINE,
147 };
148
149 /* --------------------------------------------------------------------------
150 Driver Model
151 -------------------------------------------------------------------------- */
152
acpi_ac_notify(struct acpi_device *device, u32 event)153 static void acpi_ac_notify(struct acpi_device *device, u32 event)
154 {
155 struct acpi_ac *ac = acpi_driver_data(device);
156
157 if (!ac)
158 return;
159
160 switch (event) {
161 default:
162 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
163 "Unsupported event [0x%x]\n", event));
164 fallthrough;
165 case ACPI_AC_NOTIFY_STATUS:
166 case ACPI_NOTIFY_BUS_CHECK:
167 case ACPI_NOTIFY_DEVICE_CHECK:
168 /*
169 * A buggy BIOS may notify AC first and then sleep for
170 * a specific time before doing actual operations in the
171 * EC event handler (_Qxx). This will cause the AC state
172 * reported by the ACPI event to be incorrect, so wait for a
173 * specific time for the EC event handler to make progress.
174 */
175 if (ac_sleep_before_get_state_ms > 0)
176 msleep(ac_sleep_before_get_state_ms);
177
178 acpi_ac_get_state(ac);
179 acpi_bus_generate_netlink_event(device->pnp.device_class,
180 dev_name(&device->dev), event,
181 (u32) ac->state);
182 acpi_notifier_call_chain(device, event, (u32) ac->state);
183 kobject_uevent(&ac->charger->dev.kobj, KOBJ_CHANGE);
184 }
185
186 return;
187 }
188
acpi_ac_battery_notify(struct notifier_block *nb, unsigned long action, void *data)189 static int acpi_ac_battery_notify(struct notifier_block *nb,
190 unsigned long action, void *data)
191 {
192 struct acpi_ac *ac = container_of(nb, struct acpi_ac, battery_nb);
193 struct acpi_bus_event *event = (struct acpi_bus_event *)data;
194
195 /*
196 * On HP Pavilion dv6-6179er AC status notifications aren't triggered
197 * when adapter is plugged/unplugged. However, battery status
198 * notifcations are triggered when battery starts charging or
199 * discharging. Re-reading AC status triggers lost AC notifications,
200 * if AC status has changed.
201 */
202 if (strcmp(event->device_class, ACPI_BATTERY_CLASS) == 0 &&
203 event->type == ACPI_BATTERY_NOTIFY_STATUS)
204 acpi_ac_get_state(ac);
205
206 return NOTIFY_OK;
207 }
208
thinkpad_e530_quirk(const struct dmi_system_id *d)209 static int __init thinkpad_e530_quirk(const struct dmi_system_id *d)
210 {
211 ac_sleep_before_get_state_ms = 1000;
212 return 0;
213 }
214
ac_do_not_check_pmic_quirk(const struct dmi_system_id *d)215 static int __init ac_do_not_check_pmic_quirk(const struct dmi_system_id *d)
216 {
217 ac_check_pmic = 0;
218 return 0;
219 }
220
ac_only_quirk(const struct dmi_system_id *d)221 static int __init ac_only_quirk(const struct dmi_system_id *d)
222 {
223 ac_only = 1;
224 return 0;
225 }
226
227 /* Please keep this list alphabetically sorted */
228 static const struct dmi_system_id ac_dmi_table[] __initconst = {
229 {
230 /* ECS EF20EA, AXP288 PMIC but uses separate fuel-gauge */
231 .callback = ac_do_not_check_pmic_quirk,
232 .matches = {
233 DMI_MATCH(DMI_PRODUCT_NAME, "EF20EA"),
234 },
235 },
236 {
237 /* Kodlix GK45 returning incorrect state */
238 .callback = ac_only_quirk,
239 .matches = {
240 DMI_MATCH(DMI_PRODUCT_NAME, "GK45"),
241 },
242 },
243 {
244 /* Lenovo Ideapad Miix 320, AXP288 PMIC, separate fuel-gauge */
245 .callback = ac_do_not_check_pmic_quirk,
246 .matches = {
247 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
248 DMI_MATCH(DMI_PRODUCT_NAME, "80XF"),
249 DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo MIIX 320-10ICR"),
250 },
251 },
252 {
253 /* Lenovo Thinkpad e530, see comment in acpi_ac_notify() */
254 .callback = thinkpad_e530_quirk,
255 .matches = {
256 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
257 DMI_MATCH(DMI_PRODUCT_NAME, "32597CG"),
258 },
259 },
260 {},
261 };
262
acpi_ac_add(struct acpi_device *device)263 static int acpi_ac_add(struct acpi_device *device)
264 {
265 struct power_supply_config psy_cfg = {};
266 int result = 0;
267 struct acpi_ac *ac = NULL;
268
269
270 if (!device)
271 return -EINVAL;
272
273 ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL);
274 if (!ac)
275 return -ENOMEM;
276
277 ac->device = device;
278 strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME);
279 strcpy(acpi_device_class(device), ACPI_AC_CLASS);
280 device->driver_data = ac;
281
282 result = acpi_ac_get_state(ac);
283 if (result)
284 goto end;
285
286 psy_cfg.drv_data = ac;
287
288 ac->charger_desc.name = acpi_device_bid(device);
289 ac->charger_desc.type = POWER_SUPPLY_TYPE_MAINS;
290 ac->charger_desc.properties = ac_props;
291 ac->charger_desc.num_properties = ARRAY_SIZE(ac_props);
292 ac->charger_desc.get_property = get_ac_property;
293 ac->charger = power_supply_register(&ac->device->dev,
294 &ac->charger_desc, &psy_cfg);
295 if (IS_ERR(ac->charger)) {
296 result = PTR_ERR(ac->charger);
297 goto end;
298 }
299
300 printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
301 acpi_device_name(device), acpi_device_bid(device),
302 ac->state ? "on-line" : "off-line");
303
304 ac->battery_nb.notifier_call = acpi_ac_battery_notify;
305 register_acpi_notifier(&ac->battery_nb);
306 end:
307 if (result) {
308 kfree(ac);
309 }
310
311 return result;
312 }
313
314 #ifdef CONFIG_PM_SLEEP
acpi_ac_resume(struct device *dev)315 static int acpi_ac_resume(struct device *dev)
316 {
317 struct acpi_ac *ac;
318 unsigned old_state;
319
320 if (!dev)
321 return -EINVAL;
322
323 ac = acpi_driver_data(to_acpi_device(dev));
324 if (!ac)
325 return -EINVAL;
326
327 old_state = ac->state;
328 if (acpi_ac_get_state(ac))
329 return 0;
330 if (old_state != ac->state)
331 kobject_uevent(&ac->charger->dev.kobj, KOBJ_CHANGE);
332 return 0;
333 }
334 #else
335 #define acpi_ac_resume NULL
336 #endif
337
acpi_ac_remove(struct acpi_device *device)338 static int acpi_ac_remove(struct acpi_device *device)
339 {
340 struct acpi_ac *ac = NULL;
341
342
343 if (!device || !acpi_driver_data(device))
344 return -EINVAL;
345
346 ac = acpi_driver_data(device);
347
348 power_supply_unregister(ac->charger);
349 unregister_acpi_notifier(&ac->battery_nb);
350
351 kfree(ac);
352
353 return 0;
354 }
355
acpi_ac_init(void)356 static int __init acpi_ac_init(void)
357 {
358 unsigned int i;
359 int result;
360
361 if (acpi_disabled)
362 return -ENODEV;
363
364 dmi_check_system(ac_dmi_table);
365
366 if (ac_check_pmic) {
367 for (i = 0; i < ARRAY_SIZE(acpi_ac_blacklist); i++)
368 if (acpi_dev_present(acpi_ac_blacklist[i].hid, "1",
369 acpi_ac_blacklist[i].hrv)) {
370 pr_info(PREFIX "AC: found native %s PMIC, not loading\n",
371 acpi_ac_blacklist[i].hid);
372 return -ENODEV;
373 }
374 }
375
376 result = acpi_bus_register_driver(&acpi_ac_driver);
377 if (result < 0) {
378 return -ENODEV;
379 }
380
381 return 0;
382 }
383
acpi_ac_exit(void)384 static void __exit acpi_ac_exit(void)
385 {
386 acpi_bus_unregister_driver(&acpi_ac_driver);
387 }
388 module_init(acpi_ac_init);
389 module_exit(acpi_ac_exit);
390