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