1
2
3
4
5
6
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
31MODULE_AUTHOR("Paul Diefenbaugh");
32MODULE_DESCRIPTION("ACPI AC Adapter Driver");
33MODULE_LICENSE("GPL");
34
35
36static int acpi_ac_add(struct acpi_device *device);
37static int acpi_ac_remove(struct acpi_device *device);
38static void acpi_ac_notify(struct acpi_device *device, u32 event);
39
40struct acpi_ac_bl {
41 const char *hid;
42 int hrv;
43};
44
45static const struct acpi_device_id ac_device_ids[] = {
46 {"ACPI0003", 0},
47 {"", 0},
48};
49MODULE_DEVICE_TABLE(acpi, ac_device_ids);
50
51
52static const struct acpi_ac_bl acpi_ac_blacklist[] = {
53 { "INT33F4", -1 },
54 { "INT34D3", 3 },
55};
56
57#ifdef CONFIG_PM_SLEEP
58static int acpi_ac_resume(struct device *dev);
59#endif
60static SIMPLE_DEV_PM_OPS(acpi_ac_pm, NULL, acpi_ac_resume);
61
62static int ac_sleep_before_get_state_ms;
63static int ac_check_pmic = 1;
64
65static 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
78struct 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
89static 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
110static 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
132static enum power_supply_property ac_props[] = {
133 POWER_SUPPLY_PROP_ONLINE,
134};
135
136
137static 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
154
155
156
157
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
171static 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
179
180
181
182
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
191static 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
197static 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
204static const struct dmi_system_id ac_dmi_table[] __initconst = {
205 {
206
207 .callback = ac_do_not_check_pmic_quirk,
208 .matches = {
209 DMI_MATCH(DMI_PRODUCT_NAME, "EF20EA"),
210 },
211 },
212 {
213
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
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
232static 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);
274end:
275 if (result)
276 kfree(ac);
277
278 return result;
279}
280
281#ifdef CONFIG_PM_SLEEP
282static 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
305static 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
323static 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
350static void __exit acpi_ac_exit(void)
351{
352 acpi_bus_unregister_driver(&acpi_ac_driver);
353}
354module_init(acpi_ac_init);
355module_exit(acpi_ac_exit);
356
