1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * button.c - ACPI Button Driver
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: button: " fmt
10
11 #include <linux/compiler.h>
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/init.h>
15 #include <linux/types.h>
16 #include <linux/proc_fs.h>
17 #include <linux/seq_file.h>
18 #include <linux/input.h>
19 #include <linux/slab.h>
20 #include <linux/acpi.h>
21 #include <linux/dmi.h>
22 #include <acpi/button.h>
23
24 #define ACPI_BUTTON_CLASS "button"
25 #define ACPI_BUTTON_FILE_STATE "state"
26 #define ACPI_BUTTON_TYPE_UNKNOWN 0x00
27 #define ACPI_BUTTON_NOTIFY_STATUS 0x80
28
29 #define ACPI_BUTTON_SUBCLASS_POWER "power"
30 #define ACPI_BUTTON_DEVICE_NAME_POWER "Power Button"
31 #define ACPI_BUTTON_TYPE_POWER 0x01
32
33 #define ACPI_BUTTON_SUBCLASS_SLEEP "sleep"
34 #define ACPI_BUTTON_DEVICE_NAME_SLEEP "Sleep Button"
35 #define ACPI_BUTTON_TYPE_SLEEP 0x03
36
37 #define ACPI_BUTTON_SUBCLASS_LID "lid"
38 #define ACPI_BUTTON_DEVICE_NAME_LID "Lid Switch"
39 #define ACPI_BUTTON_TYPE_LID 0x05
40
41 enum {
42 ACPI_BUTTON_LID_INIT_IGNORE,
43 ACPI_BUTTON_LID_INIT_OPEN,
44 ACPI_BUTTON_LID_INIT_METHOD,
45 ACPI_BUTTON_LID_INIT_DISABLED,
46 };
47
48 static const char * const lid_init_state_str[] = {
49 [ACPI_BUTTON_LID_INIT_IGNORE] = "ignore",
50 [ACPI_BUTTON_LID_INIT_OPEN] = "open",
51 [ACPI_BUTTON_LID_INIT_METHOD] = "method",
52 [ACPI_BUTTON_LID_INIT_DISABLED] = "disabled",
53 };
54
55 MODULE_AUTHOR("Paul Diefenbaugh");
56 MODULE_DESCRIPTION("ACPI Button Driver");
57 MODULE_LICENSE("GPL");
58
59 static const struct acpi_device_id button_device_ids[] = {
60 {ACPI_BUTTON_HID_LID, 0},
61 {ACPI_BUTTON_HID_SLEEP, 0},
62 {ACPI_BUTTON_HID_SLEEPF, 0},
63 {ACPI_BUTTON_HID_POWER, 0},
64 {ACPI_BUTTON_HID_POWERF, 0},
65 {"", 0},
66 };
67 MODULE_DEVICE_TABLE(acpi, button_device_ids);
68
69 /* Please keep this list sorted alphabetically by vendor and model */
70 static const struct dmi_system_id dmi_lid_quirks[] = {
71 {
72 /* GP-electronic T701, _LID method points to a floating GPIO */
73 .matches = {
74 DMI_MATCH(DMI_SYS_VENDOR, "Insyde"),
75 DMI_MATCH(DMI_PRODUCT_NAME, "T701"),
76 DMI_MATCH(DMI_BIOS_VERSION, "BYT70A.YNCHENG.WIN.007"),
77 },
78 .driver_data = (void *)(long)ACPI_BUTTON_LID_INIT_DISABLED,
79 },
80 {
81 /* Nextbook Ares 8A tablet, _LID device always reports lid closed */
82 .matches = {
83 DMI_MATCH(DMI_SYS_VENDOR, "Insyde"),
84 DMI_MATCH(DMI_PRODUCT_NAME, "CherryTrail"),
85 DMI_MATCH(DMI_BIOS_VERSION, "M882"),
86 },
87 .driver_data = (void *)(long)ACPI_BUTTON_LID_INIT_DISABLED,
88 },
89 {
90 /*
91 * Lenovo Yoga 9 14ITL5, initial notification of the LID device
92 * never happens.
93 */
94 .matches = {
95 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
96 DMI_MATCH(DMI_PRODUCT_NAME, "82BG"),
97 },
98 .driver_data = (void *)(long)ACPI_BUTTON_LID_INIT_OPEN,
99 },
100 {
101 /*
102 * Medion Akoya E2215T, notification of the LID device only
103 * happens on close, not on open and _LID always returns closed.
104 */
105 .matches = {
106 DMI_MATCH(DMI_SYS_VENDOR, "MEDION"),
107 DMI_MATCH(DMI_PRODUCT_NAME, "E2215T"),
108 },
109 .driver_data = (void *)(long)ACPI_BUTTON_LID_INIT_OPEN,
110 },
111 {
112 /*
113 * Medion Akoya E2228T, notification of the LID device only
114 * happens on close, not on open and _LID always returns closed.
115 */
116 .matches = {
117 DMI_MATCH(DMI_SYS_VENDOR, "MEDION"),
118 DMI_MATCH(DMI_PRODUCT_NAME, "E2228T"),
119 },
120 .driver_data = (void *)(long)ACPI_BUTTON_LID_INIT_OPEN,
121 },
122 {
123 /*
124 * Razer Blade Stealth 13 late 2019, notification of the LID device
125 * only happens on close, not on open and _LID always returns closed.
126 */
127 .matches = {
128 DMI_MATCH(DMI_SYS_VENDOR, "Razer"),
129 DMI_MATCH(DMI_PRODUCT_NAME, "Razer Blade Stealth 13 Late 2019"),
130 },
131 .driver_data = (void *)(long)ACPI_BUTTON_LID_INIT_OPEN,
132 },
133 {
134 /*
135 * Samsung galaxybook2 ,initial _LID device notification returns
136 * lid closed.
137 */
138 .matches = {
139 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
140 DMI_MATCH(DMI_PRODUCT_NAME, "750XED"),
141 },
142 .driver_data = (void *)(long)ACPI_BUTTON_LID_INIT_OPEN,
143 },
144 {}
145 };
146
147 static int acpi_button_add(struct acpi_device *device);
148 static void acpi_button_remove(struct acpi_device *device);
149
150 #ifdef CONFIG_PM_SLEEP
151 static int acpi_button_suspend(struct device *dev);
152 static int acpi_button_resume(struct device *dev);
153 #else
154 #define acpi_button_suspend NULL
155 #define acpi_button_resume NULL
156 #endif
157 static SIMPLE_DEV_PM_OPS(acpi_button_pm, acpi_button_suspend, acpi_button_resume);
158
159 static struct acpi_driver acpi_button_driver = {
160 .name = "button",
161 .class = ACPI_BUTTON_CLASS,
162 .ids = button_device_ids,
163 .ops = {
164 .add = acpi_button_add,
165 .remove = acpi_button_remove,
166 },
167 .drv.pm = &acpi_button_pm,
168 };
169
170 struct acpi_button {
171 unsigned int type;
172 struct input_dev *input;
173 char phys[32]; /* for input device */
174 unsigned long pushed;
175 int last_state;
176 ktime_t last_time;
177 bool suspended;
178 bool lid_state_initialized;
179 };
180
181 static struct acpi_device *lid_device;
182 static long lid_init_state = -1;
183
184 static unsigned long lid_report_interval __read_mostly = 500;
185 module_param(lid_report_interval, ulong, 0644);
186 MODULE_PARM_DESC(lid_report_interval, "Interval (ms) between lid key events");
187
188 /* FS Interface (/proc) */
189 static struct proc_dir_entry *acpi_button_dir;
190 static struct proc_dir_entry *acpi_lid_dir;
191
acpi_lid_evaluate_state(struct acpi_device * device)192 static int acpi_lid_evaluate_state(struct acpi_device *device)
193 {
194 unsigned long long lid_state;
195 acpi_status status;
196
197 status = acpi_evaluate_integer(device->handle, "_LID", NULL, &lid_state);
198 if (ACPI_FAILURE(status))
199 return -ENODEV;
200
201 return lid_state ? 1 : 0;
202 }
203
acpi_lid_notify_state(struct acpi_device * device,int state)204 static int acpi_lid_notify_state(struct acpi_device *device, int state)
205 {
206 struct acpi_button *button = acpi_driver_data(device);
207 ktime_t next_report;
208 bool do_update;
209
210 /*
211 * In lid_init_state=ignore mode, if user opens/closes lid
212 * frequently with "open" missing, and "last_time" is also updated
213 * frequently, "close" cannot be delivered to the userspace.
214 * So "last_time" is only updated after a timeout or an actual
215 * switch.
216 */
217 if (lid_init_state != ACPI_BUTTON_LID_INIT_IGNORE ||
218 button->last_state != !!state)
219 do_update = true;
220 else
221 do_update = false;
222
223 next_report = ktime_add(button->last_time,
224 ms_to_ktime(lid_report_interval));
225 if (button->last_state == !!state &&
226 ktime_after(ktime_get(), next_report)) {
227 /* Complain the buggy firmware */
228 pr_warn_once("The lid device is not compliant to SW_LID.\n");
229
230 /*
231 * Send the unreliable complement switch event:
232 *
233 * On most platforms, the lid device is reliable. However
234 * there are exceptions:
235 * 1. Platforms returning initial lid state as "close" by
236 * default after booting/resuming:
237 * https://bugzilla.kernel.org/show_bug.cgi?id=89211
238 * https://bugzilla.kernel.org/show_bug.cgi?id=106151
239 * 2. Platforms never reporting "open" events:
240 * https://bugzilla.kernel.org/show_bug.cgi?id=106941
241 * On these buggy platforms, the usage model of the ACPI
242 * lid device actually is:
243 * 1. The initial returning value of _LID may not be
244 * reliable.
245 * 2. The open event may not be reliable.
246 * 3. The close event is reliable.
247 *
248 * But SW_LID is typed as input switch event, the input
249 * layer checks if the event is redundant. Hence if the
250 * state is not switched, the userspace cannot see this
251 * platform triggered reliable event. By inserting a
252 * complement switch event, it then is guaranteed that the
253 * platform triggered reliable one can always be seen by
254 * the userspace.
255 */
256 if (lid_init_state == ACPI_BUTTON_LID_INIT_IGNORE) {
257 do_update = true;
258 /*
259 * Do generate complement switch event for "close"
260 * as "close" is reliable and wrong "open" won't
261 * trigger unexpected behaviors.
262 * Do not generate complement switch event for
263 * "open" as "open" is not reliable and wrong
264 * "close" will trigger unexpected behaviors.
265 */
266 if (!state) {
267 input_report_switch(button->input,
268 SW_LID, state);
269 input_sync(button->input);
270 }
271 }
272 }
273 /* Send the platform triggered reliable event */
274 if (do_update) {
275 acpi_handle_debug(device->handle, "ACPI LID %s\n",
276 state ? "open" : "closed");
277 input_report_switch(button->input, SW_LID, !state);
278 input_sync(button->input);
279 button->last_state = !!state;
280 button->last_time = ktime_get();
281 }
282
283 return 0;
284 }
285
acpi_button_state_seq_show(struct seq_file * seq,void * offset)286 static int __maybe_unused acpi_button_state_seq_show(struct seq_file *seq,
287 void *offset)
288 {
289 struct acpi_device *device = seq->private;
290 int state;
291
292 state = acpi_lid_evaluate_state(device);
293 seq_printf(seq, "state: %s\n",
294 state < 0 ? "unsupported" : (state ? "open" : "closed"));
295 return 0;
296 }
297
acpi_button_add_fs(struct acpi_device * device)298 static int acpi_button_add_fs(struct acpi_device *device)
299 {
300 struct acpi_button *button = acpi_driver_data(device);
301 struct proc_dir_entry *entry = NULL;
302 int ret = 0;
303
304 /* procfs I/F for ACPI lid device only */
305 if (button->type != ACPI_BUTTON_TYPE_LID)
306 return 0;
307
308 if (acpi_button_dir || acpi_lid_dir) {
309 pr_info("More than one Lid device found!\n");
310 return -EEXIST;
311 }
312
313 /* create /proc/acpi/button */
314 acpi_button_dir = proc_mkdir(ACPI_BUTTON_CLASS, acpi_root_dir);
315 if (!acpi_button_dir)
316 return -ENODEV;
317
318 /* create /proc/acpi/button/lid */
319 acpi_lid_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir);
320 if (!acpi_lid_dir) {
321 ret = -ENODEV;
322 goto remove_button_dir;
323 }
324
325 /* create /proc/acpi/button/lid/LID/ */
326 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), acpi_lid_dir);
327 if (!acpi_device_dir(device)) {
328 ret = -ENODEV;
329 goto remove_lid_dir;
330 }
331
332 /* create /proc/acpi/button/lid/LID/state */
333 entry = proc_create_single_data(ACPI_BUTTON_FILE_STATE, S_IRUGO,
334 acpi_device_dir(device), acpi_button_state_seq_show,
335 device);
336 if (!entry) {
337 ret = -ENODEV;
338 goto remove_dev_dir;
339 }
340
341 done:
342 return ret;
343
344 remove_dev_dir:
345 remove_proc_entry(acpi_device_bid(device),
346 acpi_lid_dir);
347 acpi_device_dir(device) = NULL;
348 remove_lid_dir:
349 remove_proc_entry(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir);
350 acpi_lid_dir = NULL;
351 remove_button_dir:
352 remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);
353 acpi_button_dir = NULL;
354 goto done;
355 }
356
acpi_button_remove_fs(struct acpi_device * device)357 static int acpi_button_remove_fs(struct acpi_device *device)
358 {
359 struct acpi_button *button = acpi_driver_data(device);
360
361 if (button->type != ACPI_BUTTON_TYPE_LID)
362 return 0;
363
364 remove_proc_entry(ACPI_BUTTON_FILE_STATE,
365 acpi_device_dir(device));
366 remove_proc_entry(acpi_device_bid(device),
367 acpi_lid_dir);
368 acpi_device_dir(device) = NULL;
369 remove_proc_entry(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir);
370 acpi_lid_dir = NULL;
371 remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);
372 acpi_button_dir = NULL;
373
374 return 0;
375 }
376
377 /* Driver Interface */
acpi_lid_open(void)378 int acpi_lid_open(void)
379 {
380 if (!lid_device)
381 return -ENODEV;
382
383 return acpi_lid_evaluate_state(lid_device);
384 }
385 EXPORT_SYMBOL(acpi_lid_open);
386
acpi_lid_update_state(struct acpi_device * device,bool signal_wakeup)387 static int acpi_lid_update_state(struct acpi_device *device,
388 bool signal_wakeup)
389 {
390 int state;
391
392 state = acpi_lid_evaluate_state(device);
393 if (state < 0)
394 return state;
395
396 if (state && signal_wakeup)
397 acpi_pm_wakeup_event(&device->dev);
398
399 return acpi_lid_notify_state(device, state);
400 }
401
acpi_lid_initialize_state(struct acpi_device * device)402 static void acpi_lid_initialize_state(struct acpi_device *device)
403 {
404 struct acpi_button *button = acpi_driver_data(device);
405
406 switch (lid_init_state) {
407 case ACPI_BUTTON_LID_INIT_OPEN:
408 (void)acpi_lid_notify_state(device, 1);
409 break;
410 case ACPI_BUTTON_LID_INIT_METHOD:
411 (void)acpi_lid_update_state(device, false);
412 break;
413 case ACPI_BUTTON_LID_INIT_IGNORE:
414 default:
415 break;
416 }
417
418 button->lid_state_initialized = true;
419 }
420
acpi_lid_notify(acpi_handle handle,u32 event,void * data)421 static void acpi_lid_notify(acpi_handle handle, u32 event, void *data)
422 {
423 struct acpi_device *device = data;
424 struct acpi_button *button;
425
426 if (event != ACPI_BUTTON_NOTIFY_STATUS) {
427 acpi_handle_debug(device->handle, "Unsupported event [0x%x]\n",
428 event);
429 return;
430 }
431
432 button = acpi_driver_data(device);
433 if (!button->lid_state_initialized)
434 return;
435
436 acpi_lid_update_state(device, true);
437 }
438
acpi_button_notify(acpi_handle handle,u32 event,void * data)439 static void acpi_button_notify(acpi_handle handle, u32 event, void *data)
440 {
441 struct acpi_device *device = data;
442 struct acpi_button *button;
443 struct input_dev *input;
444 int keycode;
445
446 if (event != ACPI_BUTTON_NOTIFY_STATUS) {
447 acpi_handle_debug(device->handle, "Unsupported event [0x%x]\n",
448 event);
449 return;
450 }
451
452 acpi_pm_wakeup_event(&device->dev);
453
454 button = acpi_driver_data(device);
455 if (button->suspended)
456 return;
457
458 input = button->input;
459 keycode = test_bit(KEY_SLEEP, input->keybit) ? KEY_SLEEP : KEY_POWER;
460
461 input_report_key(input, keycode, 1);
462 input_sync(input);
463 input_report_key(input, keycode, 0);
464 input_sync(input);
465
466 acpi_bus_generate_netlink_event(device->pnp.device_class,
467 dev_name(&device->dev),
468 event, ++button->pushed);
469 }
470
acpi_button_notify_run(void * data)471 static void acpi_button_notify_run(void *data)
472 {
473 acpi_button_notify(NULL, ACPI_BUTTON_NOTIFY_STATUS, data);
474 }
475
acpi_button_event(void * data)476 static u32 acpi_button_event(void *data)
477 {
478 acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_button_notify_run, data);
479 return ACPI_INTERRUPT_HANDLED;
480 }
481
482 #ifdef CONFIG_PM_SLEEP
acpi_button_suspend(struct device * dev)483 static int acpi_button_suspend(struct device *dev)
484 {
485 struct acpi_device *device = to_acpi_device(dev);
486 struct acpi_button *button = acpi_driver_data(device);
487
488 button->suspended = true;
489 return 0;
490 }
491
acpi_button_resume(struct device * dev)492 static int acpi_button_resume(struct device *dev)
493 {
494 struct acpi_device *device = to_acpi_device(dev);
495 struct acpi_button *button = acpi_driver_data(device);
496
497 button->suspended = false;
498 if (button->type == ACPI_BUTTON_TYPE_LID) {
499 button->last_state = !!acpi_lid_evaluate_state(device);
500 button->last_time = ktime_get();
501 acpi_lid_initialize_state(device);
502 }
503 return 0;
504 }
505 #endif
506
acpi_lid_input_open(struct input_dev * input)507 static int acpi_lid_input_open(struct input_dev *input)
508 {
509 struct acpi_device *device = input_get_drvdata(input);
510 struct acpi_button *button = acpi_driver_data(device);
511
512 button->last_state = !!acpi_lid_evaluate_state(device);
513 button->last_time = ktime_get();
514 acpi_lid_initialize_state(device);
515
516 return 0;
517 }
518
acpi_button_add(struct acpi_device * device)519 static int acpi_button_add(struct acpi_device *device)
520 {
521 acpi_notify_handler handler;
522 struct acpi_button *button;
523 struct input_dev *input;
524 const char *hid = acpi_device_hid(device);
525 acpi_status status;
526 char *name, *class;
527 int error = 0;
528
529 if (!strcmp(hid, ACPI_BUTTON_HID_LID) &&
530 lid_init_state == ACPI_BUTTON_LID_INIT_DISABLED)
531 return -ENODEV;
532
533 button = kzalloc(sizeof(struct acpi_button), GFP_KERNEL);
534 if (!button)
535 return -ENOMEM;
536
537 device->driver_data = button;
538
539 button->input = input = input_allocate_device();
540 if (!input) {
541 error = -ENOMEM;
542 goto err_free_button;
543 }
544
545 name = acpi_device_name(device);
546 class = acpi_device_class(device);
547
548 if (!strcmp(hid, ACPI_BUTTON_HID_POWER) ||
549 !strcmp(hid, ACPI_BUTTON_HID_POWERF)) {
550 button->type = ACPI_BUTTON_TYPE_POWER;
551 handler = acpi_button_notify;
552 strcpy(name, ACPI_BUTTON_DEVICE_NAME_POWER);
553 sprintf(class, "%s/%s",
554 ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_POWER);
555 } else if (!strcmp(hid, ACPI_BUTTON_HID_SLEEP) ||
556 !strcmp(hid, ACPI_BUTTON_HID_SLEEPF)) {
557 button->type = ACPI_BUTTON_TYPE_SLEEP;
558 handler = acpi_button_notify;
559 strcpy(name, ACPI_BUTTON_DEVICE_NAME_SLEEP);
560 sprintf(class, "%s/%s",
561 ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_SLEEP);
562 } else if (!strcmp(hid, ACPI_BUTTON_HID_LID)) {
563 button->type = ACPI_BUTTON_TYPE_LID;
564 handler = acpi_lid_notify;
565 strcpy(name, ACPI_BUTTON_DEVICE_NAME_LID);
566 sprintf(class, "%s/%s",
567 ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_LID);
568 input->open = acpi_lid_input_open;
569 } else {
570 pr_info("Unsupported hid [%s]\n", hid);
571 error = -ENODEV;
572 }
573
574 if (!error)
575 error = acpi_button_add_fs(device);
576
577 if (error) {
578 input_free_device(input);
579 goto err_free_button;
580 }
581
582 snprintf(button->phys, sizeof(button->phys), "%s/button/input0", hid);
583
584 input->name = name;
585 input->phys = button->phys;
586 input->id.bustype = BUS_HOST;
587 input->id.product = button->type;
588 input->dev.parent = &device->dev;
589
590 switch (button->type) {
591 case ACPI_BUTTON_TYPE_POWER:
592 input_set_capability(input, EV_KEY, KEY_POWER);
593 break;
594
595 case ACPI_BUTTON_TYPE_SLEEP:
596 input_set_capability(input, EV_KEY, KEY_SLEEP);
597 break;
598
599 case ACPI_BUTTON_TYPE_LID:
600 input_set_capability(input, EV_SW, SW_LID);
601 break;
602 }
603
604 input_set_drvdata(input, device);
605 error = input_register_device(input);
606 if (error)
607 goto err_remove_fs;
608
609 switch (device->device_type) {
610 case ACPI_BUS_TYPE_POWER_BUTTON:
611 status = acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
612 acpi_button_event,
613 device);
614 break;
615 case ACPI_BUS_TYPE_SLEEP_BUTTON:
616 status = acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
617 acpi_button_event,
618 device);
619 break;
620 default:
621 status = acpi_install_notify_handler(device->handle,
622 ACPI_DEVICE_NOTIFY, handler,
623 device);
624 break;
625 }
626 if (ACPI_FAILURE(status)) {
627 error = -ENODEV;
628 goto err_input_unregister;
629 }
630
631 if (button->type == ACPI_BUTTON_TYPE_LID) {
632 /*
633 * This assumes there's only one lid device, or if there are
634 * more we only care about the last one...
635 */
636 lid_device = device;
637 }
638
639 device_init_wakeup(&device->dev, true);
640 pr_info("%s [%s]\n", name, acpi_device_bid(device));
641 return 0;
642
643 err_input_unregister:
644 input_unregister_device(input);
645 err_remove_fs:
646 acpi_button_remove_fs(device);
647 err_free_button:
648 kfree(button);
649 return error;
650 }
651
acpi_button_remove(struct acpi_device * device)652 static void acpi_button_remove(struct acpi_device *device)
653 {
654 struct acpi_button *button = acpi_driver_data(device);
655
656 switch (device->device_type) {
657 case ACPI_BUS_TYPE_POWER_BUTTON:
658 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
659 acpi_button_event);
660 break;
661 case ACPI_BUS_TYPE_SLEEP_BUTTON:
662 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
663 acpi_button_event);
664 break;
665 default:
666 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
667 button->type == ACPI_BUTTON_TYPE_LID ?
668 acpi_lid_notify :
669 acpi_button_notify);
670 break;
671 }
672 acpi_os_wait_events_complete();
673
674 acpi_button_remove_fs(device);
675 input_unregister_device(button->input);
676 kfree(button);
677 }
678
param_set_lid_init_state(const char * val,const struct kernel_param * kp)679 static int param_set_lid_init_state(const char *val,
680 const struct kernel_param *kp)
681 {
682 int i;
683
684 i = sysfs_match_string(lid_init_state_str, val);
685 if (i < 0)
686 return i;
687
688 lid_init_state = i;
689 pr_info("Initial lid state set to '%s'\n", lid_init_state_str[i]);
690 return 0;
691 }
692
param_get_lid_init_state(char * buf,const struct kernel_param * kp)693 static int param_get_lid_init_state(char *buf, const struct kernel_param *kp)
694 {
695 int i, c = 0;
696
697 for (i = 0; i < ARRAY_SIZE(lid_init_state_str); i++)
698 if (i == lid_init_state)
699 c += sprintf(buf + c, "[%s] ", lid_init_state_str[i]);
700 else
701 c += sprintf(buf + c, "%s ", lid_init_state_str[i]);
702
703 buf[c - 1] = '\n'; /* Replace the final space with a newline */
704
705 return c;
706 }
707
708 module_param_call(lid_init_state,
709 param_set_lid_init_state, param_get_lid_init_state,
710 NULL, 0644);
711 MODULE_PARM_DESC(lid_init_state, "Behavior for reporting LID initial state");
712
acpi_button_register_driver(struct acpi_driver * driver)713 static int acpi_button_register_driver(struct acpi_driver *driver)
714 {
715 const struct dmi_system_id *dmi_id;
716
717 if (lid_init_state == -1) {
718 dmi_id = dmi_first_match(dmi_lid_quirks);
719 if (dmi_id)
720 lid_init_state = (long)dmi_id->driver_data;
721 else
722 lid_init_state = ACPI_BUTTON_LID_INIT_METHOD;
723 }
724
725 /*
726 * Modules such as nouveau.ko and i915.ko have a link time dependency
727 * on acpi_lid_open(), and would therefore not be loadable on ACPI
728 * capable kernels booted in non-ACPI mode if the return value of
729 * acpi_bus_register_driver() is returned from here with ACPI disabled
730 * when this driver is built as a module.
731 */
732 if (acpi_disabled)
733 return 0;
734
735 return acpi_bus_register_driver(driver);
736 }
737
acpi_button_unregister_driver(struct acpi_driver * driver)738 static void acpi_button_unregister_driver(struct acpi_driver *driver)
739 {
740 if (!acpi_disabled)
741 acpi_bus_unregister_driver(driver);
742 }
743
744 module_driver(acpi_button_driver, acpi_button_register_driver,
745 acpi_button_unregister_driver);
746