Merge tag 'drm-misc-fixes-2018-06-12' of git://anongit.freedesktop.org/drm/drm-misc...
[sfrench/cifs-2.6.git] / drivers / acpi / ac.c
1 /*
2  *  acpi_ac.c - ACPI AC Adapter Driver ($Revision: 27 $)
3  *
4  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
5  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
6  *
7  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
8  *
9  *  This program is free software; you can redistribute it and/or modify
10  *  it under the terms of the GNU General Public License as published by
11  *  the Free Software Foundation; either version 2 of the License, or (at
12  *  your option) any later version.
13  *
14  *  This program is distributed in the hope that it will be useful, but
15  *  WITHOUT ANY WARRANTY; without even the implied warranty of
16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
17  *  General Public License for more details.
18  *
19  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
20  */
21
22 #include <linux/kernel.h>
23 #include <linux/module.h>
24 #include <linux/slab.h>
25 #include <linux/init.h>
26 #include <linux/types.h>
27 #include <linux/dmi.h>
28 #include <linux/delay.h>
29 #ifdef CONFIG_ACPI_PROCFS_POWER
30 #include <linux/proc_fs.h>
31 #include <linux/seq_file.h>
32 #endif
33 #include <linux/platform_device.h>
34 #include <linux/power_supply.h>
35 #include <linux/acpi.h>
36 #include <acpi/battery.h>
37
38 #define PREFIX "ACPI: "
39
40 #define ACPI_AC_CLASS                   "ac_adapter"
41 #define ACPI_AC_DEVICE_NAME             "AC Adapter"
42 #define ACPI_AC_FILE_STATE              "state"
43 #define ACPI_AC_NOTIFY_STATUS           0x80
44 #define ACPI_AC_STATUS_OFFLINE          0x00
45 #define ACPI_AC_STATUS_ONLINE           0x01
46 #define ACPI_AC_STATUS_UNKNOWN          0xFF
47
48 #define _COMPONENT              ACPI_AC_COMPONENT
49 ACPI_MODULE_NAME("ac");
50
51 MODULE_AUTHOR("Paul Diefenbaugh");
52 MODULE_DESCRIPTION("ACPI AC Adapter Driver");
53 MODULE_LICENSE("GPL");
54
55
56 static int acpi_ac_add(struct acpi_device *device);
57 static int acpi_ac_remove(struct acpi_device *device);
58 static void acpi_ac_notify(struct acpi_device *device, u32 event);
59
60 struct acpi_ac_bl {
61         const char *hid;
62         int hrv;
63 };
64
65 static const struct acpi_device_id ac_device_ids[] = {
66         {"ACPI0003", 0},
67         {"", 0},
68 };
69 MODULE_DEVICE_TABLE(acpi, ac_device_ids);
70
71 /* Lists of PMIC ACPI HIDs with an (often better) native charger driver */
72 static const struct acpi_ac_bl acpi_ac_blacklist[] = {
73         { "INT33F4", -1 }, /* X-Powers AXP288 PMIC */
74         { "INT34D3",  3 }, /* Intel Cherrytrail Whiskey Cove PMIC */
75 };
76
77 #ifdef CONFIG_PM_SLEEP
78 static int acpi_ac_resume(struct device *dev);
79 #endif
80 static SIMPLE_DEV_PM_OPS(acpi_ac_pm, NULL, acpi_ac_resume);
81
82 #ifdef CONFIG_ACPI_PROCFS_POWER
83 extern struct proc_dir_entry *acpi_lock_ac_dir(void);
84 extern void *acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir);
85 #endif
86
87
88 static int ac_sleep_before_get_state_ms;
89 static int ac_check_pmic = 1;
90
91 static struct acpi_driver acpi_ac_driver = {
92         .name = "ac",
93         .class = ACPI_AC_CLASS,
94         .ids = ac_device_ids,
95         .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
96         .ops = {
97                 .add = acpi_ac_add,
98                 .remove = acpi_ac_remove,
99                 .notify = acpi_ac_notify,
100                 },
101         .drv.pm = &acpi_ac_pm,
102 };
103
104 struct acpi_ac {
105         struct power_supply *charger;
106         struct power_supply_desc charger_desc;
107         struct acpi_device * device;
108         unsigned long long state;
109         struct notifier_block battery_nb;
110 };
111
112 #define to_acpi_ac(x) power_supply_get_drvdata(x)
113
114 /* --------------------------------------------------------------------------
115                                AC Adapter Management
116    -------------------------------------------------------------------------- */
117
118 static int acpi_ac_get_state(struct acpi_ac *ac)
119 {
120         acpi_status status = AE_OK;
121
122         if (!ac)
123                 return -EINVAL;
124
125         status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL,
126                                        &ac->state);
127         if (ACPI_FAILURE(status)) {
128                 ACPI_EXCEPTION((AE_INFO, status,
129                                 "Error reading AC Adapter state"));
130                 ac->state = ACPI_AC_STATUS_UNKNOWN;
131                 return -ENODEV;
132         }
133
134         return 0;
135 }
136
137 /* --------------------------------------------------------------------------
138                             sysfs I/F
139    -------------------------------------------------------------------------- */
140 static int get_ac_property(struct power_supply *psy,
141                            enum power_supply_property psp,
142                            union power_supply_propval *val)
143 {
144         struct acpi_ac *ac = to_acpi_ac(psy);
145
146         if (!ac)
147                 return -ENODEV;
148
149         if (acpi_ac_get_state(ac))
150                 return -ENODEV;
151
152         switch (psp) {
153         case POWER_SUPPLY_PROP_ONLINE:
154                 val->intval = ac->state;
155                 break;
156         default:
157                 return -EINVAL;
158         }
159         return 0;
160 }
161
162 static enum power_supply_property ac_props[] = {
163         POWER_SUPPLY_PROP_ONLINE,
164 };
165
166 #ifdef CONFIG_ACPI_PROCFS_POWER
167 /* --------------------------------------------------------------------------
168                               FS Interface (/proc)
169    -------------------------------------------------------------------------- */
170
171 static struct proc_dir_entry *acpi_ac_dir;
172
173 static int acpi_ac_seq_show(struct seq_file *seq, void *offset)
174 {
175         struct acpi_ac *ac = seq->private;
176
177
178         if (!ac)
179                 return 0;
180
181         if (acpi_ac_get_state(ac)) {
182                 seq_puts(seq, "ERROR: Unable to read AC Adapter state\n");
183                 return 0;
184         }
185
186         seq_puts(seq, "state:                   ");
187         switch (ac->state) {
188         case ACPI_AC_STATUS_OFFLINE:
189                 seq_puts(seq, "off-line\n");
190                 break;
191         case ACPI_AC_STATUS_ONLINE:
192                 seq_puts(seq, "on-line\n");
193                 break;
194         default:
195                 seq_puts(seq, "unknown\n");
196                 break;
197         }
198
199         return 0;
200 }
201
202 static int acpi_ac_add_fs(struct acpi_ac *ac)
203 {
204         struct proc_dir_entry *entry = NULL;
205
206         printk(KERN_WARNING PREFIX "Deprecated procfs I/F for AC is loaded,"
207                         " please retry with CONFIG_ACPI_PROCFS_POWER cleared\n");
208         if (!acpi_device_dir(ac->device)) {
209                 acpi_device_dir(ac->device) =
210                         proc_mkdir(acpi_device_bid(ac->device), acpi_ac_dir);
211                 if (!acpi_device_dir(ac->device))
212                         return -ENODEV;
213         }
214
215         /* 'state' [R] */
216         entry = proc_create_single_data(ACPI_AC_FILE_STATE, S_IRUGO,
217                         acpi_device_dir(ac->device), acpi_ac_seq_show, ac);
218         if (!entry)
219                 return -ENODEV;
220         return 0;
221 }
222
223 static int acpi_ac_remove_fs(struct acpi_ac *ac)
224 {
225
226         if (acpi_device_dir(ac->device)) {
227                 remove_proc_entry(ACPI_AC_FILE_STATE,
228                                   acpi_device_dir(ac->device));
229                 remove_proc_entry(acpi_device_bid(ac->device), acpi_ac_dir);
230                 acpi_device_dir(ac->device) = NULL;
231         }
232
233         return 0;
234 }
235 #endif
236
237 /* --------------------------------------------------------------------------
238                                    Driver Model
239    -------------------------------------------------------------------------- */
240
241 static void acpi_ac_notify(struct acpi_device *device, u32 event)
242 {
243         struct acpi_ac *ac = acpi_driver_data(device);
244
245         if (!ac)
246                 return;
247
248         switch (event) {
249         default:
250                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
251                                   "Unsupported event [0x%x]\n", event));
252         /* fall through */
253         case ACPI_AC_NOTIFY_STATUS:
254         case ACPI_NOTIFY_BUS_CHECK:
255         case ACPI_NOTIFY_DEVICE_CHECK:
256                 /*
257                  * A buggy BIOS may notify AC first and then sleep for
258                  * a specific time before doing actual operations in the
259                  * EC event handler (_Qxx). This will cause the AC state
260                  * reported by the ACPI event to be incorrect, so wait for a
261                  * specific time for the EC event handler to make progress.
262                  */
263                 if (ac_sleep_before_get_state_ms > 0)
264                         msleep(ac_sleep_before_get_state_ms);
265
266                 acpi_ac_get_state(ac);
267                 acpi_bus_generate_netlink_event(device->pnp.device_class,
268                                                   dev_name(&device->dev), event,
269                                                   (u32) ac->state);
270                 acpi_notifier_call_chain(device, event, (u32) ac->state);
271                 kobject_uevent(&ac->charger->dev.kobj, KOBJ_CHANGE);
272         }
273
274         return;
275 }
276
277 static int acpi_ac_battery_notify(struct notifier_block *nb,
278                                   unsigned long action, void *data)
279 {
280         struct acpi_ac *ac = container_of(nb, struct acpi_ac, battery_nb);
281         struct acpi_bus_event *event = (struct acpi_bus_event *)data;
282
283         /*
284          * On HP Pavilion dv6-6179er AC status notifications aren't triggered
285          * when adapter is plugged/unplugged. However, battery status
286          * notifcations are triggered when battery starts charging or
287          * discharging. Re-reading AC status triggers lost AC notifications,
288          * if AC status has changed.
289          */
290         if (strcmp(event->device_class, ACPI_BATTERY_CLASS) == 0 &&
291             event->type == ACPI_BATTERY_NOTIFY_STATUS)
292                 acpi_ac_get_state(ac);
293
294         return NOTIFY_OK;
295 }
296
297 static int __init thinkpad_e530_quirk(const struct dmi_system_id *d)
298 {
299         ac_sleep_before_get_state_ms = 1000;
300         return 0;
301 }
302
303 static int __init ac_do_not_check_pmic_quirk(const struct dmi_system_id *d)
304 {
305         ac_check_pmic = 0;
306         return 0;
307 }
308
309 static const struct dmi_system_id ac_dmi_table[]  __initconst = {
310         {
311         /* Thinkpad e530 */
312         .callback = thinkpad_e530_quirk,
313         .matches = {
314                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
315                 DMI_MATCH(DMI_PRODUCT_NAME, "32597CG"),
316                 },
317         },
318         {
319                 /* ECS EF20EA */
320                 .callback = ac_do_not_check_pmic_quirk,
321                 .matches = {
322                         DMI_MATCH(DMI_PRODUCT_NAME, "EF20EA"),
323                 },
324         },
325         {
326                 /* Lenovo Ideapad Miix 320 */
327                 .callback = ac_do_not_check_pmic_quirk,
328                 .matches = {
329                   DMI_EXACT_MATCH(DMI_SYS_VENDOR, "LENOVO"),
330                   DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "80XF"),
331                   DMI_EXACT_MATCH(DMI_PRODUCT_VERSION, "Lenovo MIIX 320-10ICR"),
332                 },
333         },
334         {},
335 };
336
337 static int acpi_ac_add(struct acpi_device *device)
338 {
339         struct power_supply_config psy_cfg = {};
340         int result = 0;
341         struct acpi_ac *ac = NULL;
342
343
344         if (!device)
345                 return -EINVAL;
346
347         ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL);
348         if (!ac)
349                 return -ENOMEM;
350
351         ac->device = device;
352         strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME);
353         strcpy(acpi_device_class(device), ACPI_AC_CLASS);
354         device->driver_data = ac;
355
356         result = acpi_ac_get_state(ac);
357         if (result)
358                 goto end;
359
360         psy_cfg.drv_data = ac;
361
362         ac->charger_desc.name = acpi_device_bid(device);
363 #ifdef CONFIG_ACPI_PROCFS_POWER
364         result = acpi_ac_add_fs(ac);
365         if (result)
366                 goto end;
367 #endif
368         ac->charger_desc.type = POWER_SUPPLY_TYPE_MAINS;
369         ac->charger_desc.properties = ac_props;
370         ac->charger_desc.num_properties = ARRAY_SIZE(ac_props);
371         ac->charger_desc.get_property = get_ac_property;
372         ac->charger = power_supply_register(&ac->device->dev,
373                                             &ac->charger_desc, &psy_cfg);
374         if (IS_ERR(ac->charger)) {
375                 result = PTR_ERR(ac->charger);
376                 goto end;
377         }
378
379         printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
380                acpi_device_name(device), acpi_device_bid(device),
381                ac->state ? "on-line" : "off-line");
382
383         ac->battery_nb.notifier_call = acpi_ac_battery_notify;
384         register_acpi_notifier(&ac->battery_nb);
385 end:
386         if (result) {
387 #ifdef CONFIG_ACPI_PROCFS_POWER
388                 acpi_ac_remove_fs(ac);
389 #endif
390                 kfree(ac);
391         }
392
393         return result;
394 }
395
396 #ifdef CONFIG_PM_SLEEP
397 static int acpi_ac_resume(struct device *dev)
398 {
399         struct acpi_ac *ac;
400         unsigned old_state;
401
402         if (!dev)
403                 return -EINVAL;
404
405         ac = acpi_driver_data(to_acpi_device(dev));
406         if (!ac)
407                 return -EINVAL;
408
409         old_state = ac->state;
410         if (acpi_ac_get_state(ac))
411                 return 0;
412         if (old_state != ac->state)
413                 kobject_uevent(&ac->charger->dev.kobj, KOBJ_CHANGE);
414         return 0;
415 }
416 #else
417 #define acpi_ac_resume NULL
418 #endif
419
420 static int acpi_ac_remove(struct acpi_device *device)
421 {
422         struct acpi_ac *ac = NULL;
423
424
425         if (!device || !acpi_driver_data(device))
426                 return -EINVAL;
427
428         ac = acpi_driver_data(device);
429
430         power_supply_unregister(ac->charger);
431         unregister_acpi_notifier(&ac->battery_nb);
432
433 #ifdef CONFIG_ACPI_PROCFS_POWER
434         acpi_ac_remove_fs(ac);
435 #endif
436
437         kfree(ac);
438
439         return 0;
440 }
441
442 static int __init acpi_ac_init(void)
443 {
444         unsigned int i;
445         int result;
446
447         if (acpi_disabled)
448                 return -ENODEV;
449
450         dmi_check_system(ac_dmi_table);
451
452         if (ac_check_pmic) {
453                 for (i = 0; i < ARRAY_SIZE(acpi_ac_blacklist); i++)
454                         if (acpi_dev_present(acpi_ac_blacklist[i].hid, "1",
455                                              acpi_ac_blacklist[i].hrv)) {
456                                 pr_info(PREFIX "AC: found native %s PMIC, not loading\n",
457                                         acpi_ac_blacklist[i].hid);
458                                 return -ENODEV;
459                         }
460         }
461
462 #ifdef CONFIG_ACPI_PROCFS_POWER
463         acpi_ac_dir = acpi_lock_ac_dir();
464         if (!acpi_ac_dir)
465                 return -ENODEV;
466 #endif
467
468
469         result = acpi_bus_register_driver(&acpi_ac_driver);
470         if (result < 0) {
471 #ifdef CONFIG_ACPI_PROCFS_POWER
472                 acpi_unlock_ac_dir(acpi_ac_dir);
473 #endif
474                 return -ENODEV;
475         }
476
477         return 0;
478 }
479
480 static void __exit acpi_ac_exit(void)
481 {
482         acpi_bus_unregister_driver(&acpi_ac_driver);
483 #ifdef CONFIG_ACPI_PROCFS_POWER
484         acpi_unlock_ac_dir(acpi_ac_dir);
485 #endif
486 }
487 module_init(acpi_ac_init);
488 module_exit(acpi_ac_exit);