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