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_WAKE 0x02
28#define ACPI_BUTTON_NOTIFY_STATUS 0x80
29
30#define ACPI_BUTTON_SUBCLASS_POWER "power"
31#define ACPI_BUTTON_DEVICE_NAME_POWER "Power Button"
32#define ACPI_BUTTON_TYPE_POWER 0x01
33
34#define ACPI_BUTTON_SUBCLASS_SLEEP "sleep"
35#define ACPI_BUTTON_DEVICE_NAME_SLEEP "Sleep Button"
36#define ACPI_BUTTON_TYPE_SLEEP 0x03
37
38#define ACPI_BUTTON_SUBCLASS_LID "lid"
39#define ACPI_BUTTON_DEVICE_NAME_LID "Lid Switch"
40#define ACPI_BUTTON_TYPE_LID 0x05
41
42enum {
43 ACPI_BUTTON_LID_INIT_IGNORE,
44 ACPI_BUTTON_LID_INIT_OPEN,
45 ACPI_BUTTON_LID_INIT_METHOD,
46 ACPI_BUTTON_LID_INIT_DISABLED,
47};
48
49static const char * const lid_init_state_str[] = {
50 [ACPI_BUTTON_LID_INIT_IGNORE] = "ignore",
51 [ACPI_BUTTON_LID_INIT_OPEN] = "open",
52 [ACPI_BUTTON_LID_INIT_METHOD] = "method",
53 [ACPI_BUTTON_LID_INIT_DISABLED] = "disabled",
54};
55
56MODULE_AUTHOR("Paul Diefenbaugh");
57MODULE_DESCRIPTION("ACPI Button Driver");
58MODULE_LICENSE("GPL");
59
60static const struct acpi_device_id button_device_ids[] = {
61 {ACPI_BUTTON_HID_LID, 0},
62 {ACPI_BUTTON_HID_SLEEP, .driver_data: 0},
63 {ACPI_BUTTON_HID_SLEEPF, .driver_data: 0},
64 {ACPI_BUTTON_HID_POWER, .driver_data: 0},
65 {ACPI_BUTTON_HID_POWERF, .driver_data: 0},
66 {.id: "", .driver_data: 0},
67};
68MODULE_DEVICE_TABLE(acpi, button_device_ids);
69
70/* Please keep this list sorted alphabetically by vendor and model */
71static const struct dmi_system_id dmi_lid_quirks[] = {
72 {
73 /* GP-electronic T701, _LID method points to a floating GPIO */
74 .matches = {
75 DMI_MATCH(DMI_SYS_VENDOR, "Insyde"),
76 DMI_MATCH(DMI_PRODUCT_NAME, "T701"),
77 DMI_MATCH(DMI_BIOS_VERSION, "BYT70A.YNCHENG.WIN.007"),
78 },
79 .driver_data = (void *)(long)ACPI_BUTTON_LID_INIT_DISABLED,
80 },
81 {
82 /* Nextbook Ares 8A tablet, _LID device always reports lid closed */
83 .matches = {
84 DMI_MATCH(DMI_SYS_VENDOR, "Insyde"),
85 DMI_MATCH(DMI_PRODUCT_NAME, "CherryTrail"),
86 DMI_MATCH(DMI_BIOS_VERSION, "M882"),
87 },
88 .driver_data = (void *)(long)ACPI_BUTTON_LID_INIT_DISABLED,
89 },
90 {
91 /*
92 * Lenovo Yoga 9 14ITL5, initial notification of the LID device
93 * never happens.
94 */
95 .matches = {
96 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
97 DMI_MATCH(DMI_PRODUCT_NAME, "82BG"),
98 },
99 .driver_data = (void *)(long)ACPI_BUTTON_LID_INIT_OPEN,
100 },
101 {
102 /*
103 * Medion Akoya E2215T, notification of the LID device only
104 * happens on close, not on open and _LID always returns closed.
105 */
106 .matches = {
107 DMI_MATCH(DMI_SYS_VENDOR, "MEDION"),
108 DMI_MATCH(DMI_PRODUCT_NAME, "E2215T"),
109 },
110 .driver_data = (void *)(long)ACPI_BUTTON_LID_INIT_OPEN,
111 },
112 {
113 /*
114 * Medion Akoya E2228T, notification of the LID device only
115 * happens on close, not on open and _LID always returns closed.
116 */
117 .matches = {
118 DMI_MATCH(DMI_SYS_VENDOR, "MEDION"),
119 DMI_MATCH(DMI_PRODUCT_NAME, "E2228T"),
120 },
121 .driver_data = (void *)(long)ACPI_BUTTON_LID_INIT_OPEN,
122 },
123 {
124 /*
125 * Razer Blade Stealth 13 late 2019, notification of the LID device
126 * only happens on close, not on open and _LID always returns closed.
127 */
128 .matches = {
129 DMI_MATCH(DMI_SYS_VENDOR, "Razer"),
130 DMI_MATCH(DMI_PRODUCT_NAME, "Razer Blade Stealth 13 Late 2019"),
131 },
132 .driver_data = (void *)(long)ACPI_BUTTON_LID_INIT_OPEN,
133 },
134 {
135 /*
136 * Samsung galaxybook2 ,initial _LID device notification returns
137 * lid closed.
138 */
139 .matches = {
140 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
141 DMI_MATCH(DMI_PRODUCT_NAME, "750XED"),
142 },
143 .driver_data = (void *)(long)ACPI_BUTTON_LID_INIT_OPEN,
144 },
145 {}
146};
147
148static int acpi_button_add(struct acpi_device *device);
149static void acpi_button_remove(struct acpi_device *device);
150
151#ifdef CONFIG_PM_SLEEP
152static int acpi_button_suspend(struct device *dev);
153static int acpi_button_resume(struct device *dev);
154#else
155#define acpi_button_suspend NULL
156#define acpi_button_resume NULL
157#endif
158static SIMPLE_DEV_PM_OPS(acpi_button_pm, acpi_button_suspend, acpi_button_resume);
159
160static struct acpi_driver acpi_button_driver = {
161 .name = "button",
162 .class = ACPI_BUTTON_CLASS,
163 .ids = button_device_ids,
164 .ops = {
165 .add = acpi_button_add,
166 .remove = acpi_button_remove,
167 },
168 .drv.pm = &acpi_button_pm,
169};
170
171struct acpi_button {
172 unsigned int type;
173 struct input_dev *input;
174 char phys[32]; /* for input device */
175 unsigned long pushed;
176 int last_state;
177 ktime_t last_time;
178 bool suspended;
179 bool lid_state_initialized;
180};
181
182static struct acpi_device *lid_device;
183static long lid_init_state = -1;
184
185static unsigned long lid_report_interval __read_mostly = 500;
186module_param(lid_report_interval, ulong, 0644);
187MODULE_PARM_DESC(lid_report_interval, "Interval (ms) between lid key events");
188
189/* FS Interface (/proc) */
190static struct proc_dir_entry *acpi_button_dir;
191static struct proc_dir_entry *acpi_lid_dir;
192
193static int acpi_lid_evaluate_state(struct acpi_device *device)
194{
195 unsigned long long lid_state;
196 acpi_status status;
197
198 status = acpi_evaluate_integer(handle: device->handle, pathname: "_LID", NULL, data: &lid_state);
199 if (ACPI_FAILURE(status))
200 return -ENODEV;
201
202 return lid_state ? 1 : 0;
203}
204
205static int acpi_lid_notify_state(struct acpi_device *device, int state)
206{
207 struct acpi_button *button = acpi_driver_data(d: device);
208 ktime_t next_report;
209 bool do_update;
210
211 /*
212 * In lid_init_state=ignore mode, if user opens/closes lid
213 * frequently with "open" missing, and "last_time" is also updated
214 * frequently, "close" cannot be delivered to the userspace.
215 * So "last_time" is only updated after a timeout or an actual
216 * switch.
217 */
218 if (lid_init_state != ACPI_BUTTON_LID_INIT_IGNORE ||
219 button->last_state != !!state)
220 do_update = true;
221 else
222 do_update = false;
223
224 next_report = ktime_add(button->last_time,
225 ms_to_ktime(lid_report_interval));
226 if (button->last_state == !!state &&
227 ktime_after(cmp1: ktime_get(), cmp2: next_report)) {
228 /* Complain the buggy firmware */
229 pr_warn_once("The lid device is not compliant to SW_LID.\n");
230
231 /*
232 * Send the unreliable complement switch event:
233 *
234 * On most platforms, the lid device is reliable. However
235 * there are exceptions:
236 * 1. Platforms returning initial lid state as "close" by
237 * default after booting/resuming:
238 * https://bugzilla.kernel.org/show_bug.cgi?id=89211
239 * https://bugzilla.kernel.org/show_bug.cgi?id=106151
240 * 2. Platforms never reporting "open" events:
241 * https://bugzilla.kernel.org/show_bug.cgi?id=106941
242 * On these buggy platforms, the usage model of the ACPI
243 * lid device actually is:
244 * 1. The initial returning value of _LID may not be
245 * reliable.
246 * 2. The open event may not be reliable.
247 * 3. The close event is reliable.
248 *
249 * But SW_LID is typed as input switch event, the input
250 * layer checks if the event is redundant. Hence if the
251 * state is not switched, the userspace cannot see this
252 * platform triggered reliable event. By inserting a
253 * complement switch event, it then is guaranteed that the
254 * platform triggered reliable one can always be seen by
255 * the userspace.
256 */
257 if (lid_init_state == ACPI_BUTTON_LID_INIT_IGNORE) {
258 do_update = true;
259 /*
260 * Do generate complement switch event for "close"
261 * as "close" is reliable and wrong "open" won't
262 * trigger unexpected behaviors.
263 * Do not generate complement switch event for
264 * "open" as "open" is not reliable and wrong
265 * "close" will trigger unexpected behaviors.
266 */
267 if (!state) {
268 input_report_switch(dev: button->input,
269 SW_LID, value: state);
270 input_sync(dev: button->input);
271 }
272 }
273 }
274 /* Send the platform triggered reliable event */
275 if (do_update) {
276 acpi_handle_debug(device->handle, "ACPI LID %s\n",
277 state ? "open" : "closed");
278 input_report_switch(dev: button->input, SW_LID, value: !state);
279 input_sync(dev: button->input);
280 button->last_state = !!state;
281 button->last_time = ktime_get();
282 }
283
284 return 0;
285}
286
287static int __maybe_unused acpi_button_state_seq_show(struct seq_file *seq,
288 void *offset)
289{
290 struct acpi_device *device = seq->private;
291 int state;
292
293 state = acpi_lid_evaluate_state(device);
294 seq_printf(m: seq, fmt: "state: %s\n",
295 state < 0 ? "unsupported" : (state ? "open" : "closed"));
296 return 0;
297}
298
299static int acpi_button_add_fs(struct acpi_device *device)
300{
301 struct acpi_button *button = acpi_driver_data(d: device);
302 struct proc_dir_entry *entry = NULL;
303 int ret = 0;
304
305 /* procfs I/F for ACPI lid device only */
306 if (button->type != ACPI_BUTTON_TYPE_LID)
307 return 0;
308
309 if (acpi_button_dir || acpi_lid_dir) {
310 pr_info("More than one Lid device found!\n");
311 return -EEXIST;
312 }
313
314 /* create /proc/acpi/button */
315 acpi_button_dir = proc_mkdir(ACPI_BUTTON_CLASS, acpi_root_dir);
316 if (!acpi_button_dir)
317 return -ENODEV;
318
319 /* create /proc/acpi/button/lid */
320 acpi_lid_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir);
321 if (!acpi_lid_dir) {
322 ret = -ENODEV;
323 goto remove_button_dir;
324 }
325
326 /* create /proc/acpi/button/lid/LID/ */
327 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), acpi_lid_dir);
328 if (!acpi_device_dir(device)) {
329 ret = -ENODEV;
330 goto remove_lid_dir;
331 }
332
333 /* create /proc/acpi/button/lid/LID/state */
334 entry = proc_create_single_data(ACPI_BUTTON_FILE_STATE, S_IRUGO,
335 acpi_device_dir(device), show: acpi_button_state_seq_show,
336 data: device);
337 if (!entry) {
338 ret = -ENODEV;
339 goto remove_dev_dir;
340 }
341
342done:
343 return ret;
344
345remove_dev_dir:
346 remove_proc_entry(acpi_device_bid(device),
347 acpi_lid_dir);
348 acpi_device_dir(device) = NULL;
349remove_lid_dir:
350 remove_proc_entry(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir);
351 acpi_lid_dir = NULL;
352remove_button_dir:
353 remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);
354 acpi_button_dir = NULL;
355 goto done;
356}
357
358static int acpi_button_remove_fs(struct acpi_device *device)
359{
360 struct acpi_button *button = acpi_driver_data(d: device);
361
362 if (button->type != ACPI_BUTTON_TYPE_LID)
363 return 0;
364
365 remove_proc_entry(ACPI_BUTTON_FILE_STATE,
366 acpi_device_dir(device));
367 remove_proc_entry(acpi_device_bid(device),
368 acpi_lid_dir);
369 acpi_device_dir(device) = NULL;
370 remove_proc_entry(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir);
371 acpi_lid_dir = NULL;
372 remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);
373 acpi_button_dir = NULL;
374
375 return 0;
376}
377
378/* Driver Interface */
379int acpi_lid_open(void)
380{
381 if (!lid_device)
382 return -ENODEV;
383
384 return acpi_lid_evaluate_state(device: lid_device);
385}
386EXPORT_SYMBOL(acpi_lid_open);
387
388static int acpi_lid_update_state(struct acpi_device *device,
389 bool signal_wakeup)
390{
391 int state;
392
393 state = acpi_lid_evaluate_state(device);
394 if (state < 0)
395 return state;
396
397 if (state && signal_wakeup)
398 acpi_pm_wakeup_event(dev: &device->dev);
399
400 return acpi_lid_notify_state(device, state);
401}
402
403static void acpi_lid_initialize_state(struct acpi_device *device)
404{
405 struct acpi_button *button = acpi_driver_data(d: device);
406
407 switch (lid_init_state) {
408 case ACPI_BUTTON_LID_INIT_OPEN:
409 (void)acpi_lid_notify_state(device, state: 1);
410 break;
411 case ACPI_BUTTON_LID_INIT_METHOD:
412 (void)acpi_lid_update_state(device, signal_wakeup: false);
413 break;
414 case ACPI_BUTTON_LID_INIT_IGNORE:
415 default:
416 break;
417 }
418
419 button->lid_state_initialized = true;
420}
421
422static void acpi_lid_notify(acpi_handle handle, u32 event, void *data)
423{
424 struct acpi_device *device = data;
425 struct acpi_button *button;
426
427 if (event != ACPI_BUTTON_NOTIFY_STATUS) {
428 acpi_handle_debug(device->handle, "Unsupported event [0x%x]\n",
429 event);
430 return;
431 }
432
433 button = acpi_driver_data(d: device);
434 if (!button->lid_state_initialized)
435 return;
436
437 acpi_lid_update_state(device, signal_wakeup: true);
438}
439
440static void acpi_button_notify(acpi_handle handle, u32 event, void *data)
441{
442 struct acpi_device *device = data;
443 struct acpi_button *button;
444 struct input_dev *input;
445 int keycode;
446
447 switch (event) {
448 case ACPI_BUTTON_NOTIFY_STATUS:
449 break;
450 case ACPI_BUTTON_NOTIFY_WAKE:
451 break;
452 default:
453 acpi_handle_debug(device->handle, "Unsupported event [0x%x]\n",
454 event);
455 return;
456 }
457
458 acpi_pm_wakeup_event(dev: &device->dev);
459
460 button = acpi_driver_data(d: device);
461 if (button->suspended || event == ACPI_BUTTON_NOTIFY_WAKE)
462 return;
463
464 input = button->input;
465 keycode = test_bit(KEY_SLEEP, input->keybit) ? KEY_SLEEP : KEY_POWER;
466
467 input_report_key(dev: input, code: keycode, value: 1);
468 input_sync(dev: input);
469 input_report_key(dev: input, code: keycode, value: 0);
470 input_sync(dev: input);
471
472 acpi_bus_generate_netlink_event(device->pnp.device_class,
473 dev_name(dev: &device->dev),
474 event, ++button->pushed);
475}
476
477static void acpi_button_notify_run(void *data)
478{
479 acpi_button_notify(NULL, ACPI_BUTTON_NOTIFY_STATUS, data);
480}
481
482static u32 acpi_button_event(void *data)
483{
484 acpi_os_execute(type: OSL_NOTIFY_HANDLER, function: acpi_button_notify_run, context: data);
485 return ACPI_INTERRUPT_HANDLED;
486}
487
488#ifdef CONFIG_PM_SLEEP
489static int acpi_button_suspend(struct device *dev)
490{
491 struct acpi_device *device = to_acpi_device(dev);
492 struct acpi_button *button = acpi_driver_data(d: device);
493
494 button->suspended = true;
495 return 0;
496}
497
498static int acpi_button_resume(struct device *dev)
499{
500 struct input_dev *input;
501 struct acpi_device *device = to_acpi_device(dev);
502 struct acpi_button *button = acpi_driver_data(d: device);
503
504 button->suspended = false;
505 if (button->type == ACPI_BUTTON_TYPE_LID) {
506 button->last_state = !!acpi_lid_evaluate_state(device);
507 button->last_time = ktime_get();
508 acpi_lid_initialize_state(device);
509 }
510
511 if (button->type == ACPI_BUTTON_TYPE_POWER) {
512 input = button->input;
513 input_report_key(dev: input, KEY_WAKEUP, value: 1);
514 input_sync(dev: input);
515 input_report_key(dev: input, KEY_WAKEUP, value: 0);
516 input_sync(dev: input);
517 }
518 return 0;
519}
520#endif
521
522static int acpi_lid_input_open(struct input_dev *input)
523{
524 struct acpi_device *device = input_get_drvdata(dev: input);
525 struct acpi_button *button = acpi_driver_data(d: device);
526
527 button->last_state = !!acpi_lid_evaluate_state(device);
528 button->last_time = ktime_get();
529 acpi_lid_initialize_state(device);
530
531 return 0;
532}
533
534static int acpi_button_add(struct acpi_device *device)
535{
536 acpi_notify_handler handler;
537 struct acpi_button *button;
538 struct input_dev *input;
539 const char *hid = acpi_device_hid(device);
540 acpi_status status;
541 char *name, *class;
542 int error = 0;
543
544 if (!strcmp(hid, ACPI_BUTTON_HID_LID) &&
545 lid_init_state == ACPI_BUTTON_LID_INIT_DISABLED)
546 return -ENODEV;
547
548 button = kzalloc(sizeof(struct acpi_button), GFP_KERNEL);
549 if (!button)
550 return -ENOMEM;
551
552 device->driver_data = button;
553
554 button->input = input = input_allocate_device();
555 if (!input) {
556 error = -ENOMEM;
557 goto err_free_button;
558 }
559
560 name = acpi_device_name(device);
561 class = acpi_device_class(device);
562
563 if (!strcmp(hid, ACPI_BUTTON_HID_POWER) ||
564 !strcmp(hid, ACPI_BUTTON_HID_POWERF)) {
565 button->type = ACPI_BUTTON_TYPE_POWER;
566 handler = acpi_button_notify;
567 strscpy(name, ACPI_BUTTON_DEVICE_NAME_POWER, MAX_ACPI_DEVICE_NAME_LEN);
568 sprintf(buf: class, fmt: "%s/%s",
569 ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_POWER);
570 } else if (!strcmp(hid, ACPI_BUTTON_HID_SLEEP) ||
571 !strcmp(hid, ACPI_BUTTON_HID_SLEEPF)) {
572 button->type = ACPI_BUTTON_TYPE_SLEEP;
573 handler = acpi_button_notify;
574 strscpy(name, ACPI_BUTTON_DEVICE_NAME_SLEEP, MAX_ACPI_DEVICE_NAME_LEN);
575 sprintf(buf: class, fmt: "%s/%s",
576 ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_SLEEP);
577 } else if (!strcmp(hid, ACPI_BUTTON_HID_LID)) {
578 button->type = ACPI_BUTTON_TYPE_LID;
579 handler = acpi_lid_notify;
580 strscpy(name, ACPI_BUTTON_DEVICE_NAME_LID, MAX_ACPI_DEVICE_NAME_LEN);
581 sprintf(buf: class, fmt: "%s/%s",
582 ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_LID);
583 input->open = acpi_lid_input_open;
584 } else {
585 pr_info("Unsupported hid [%s]\n", hid);
586 error = -ENODEV;
587 }
588
589 if (!error)
590 error = acpi_button_add_fs(device);
591
592 if (error) {
593 input_free_device(dev: input);
594 goto err_free_button;
595 }
596
597 snprintf(buf: button->phys, size: sizeof(button->phys), fmt: "%s/button/input0", hid);
598
599 input->name = name;
600 input->phys = button->phys;
601 input->id.bustype = BUS_HOST;
602 input->id.product = button->type;
603 input->dev.parent = &device->dev;
604
605 switch (button->type) {
606 case ACPI_BUTTON_TYPE_POWER:
607 input_set_capability(dev: input, EV_KEY, KEY_POWER);
608 input_set_capability(dev: input, EV_KEY, KEY_WAKEUP);
609 break;
610
611 case ACPI_BUTTON_TYPE_SLEEP:
612 input_set_capability(dev: input, EV_KEY, KEY_SLEEP);
613 break;
614
615 case ACPI_BUTTON_TYPE_LID:
616 input_set_capability(dev: input, EV_SW, SW_LID);
617 break;
618 }
619
620 input_set_drvdata(dev: input, data: device);
621 error = input_register_device(input);
622 if (error)
623 goto err_remove_fs;
624
625 switch (device->device_type) {
626 case ACPI_BUS_TYPE_POWER_BUTTON:
627 status = acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
628 handler: acpi_button_event,
629 context: device);
630 break;
631 case ACPI_BUS_TYPE_SLEEP_BUTTON:
632 status = acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
633 handler: acpi_button_event,
634 context: device);
635 break;
636 default:
637 status = acpi_install_notify_handler(device: device->handle,
638 ACPI_ALL_NOTIFY, handler,
639 context: device);
640 break;
641 }
642 if (ACPI_FAILURE(status)) {
643 error = -ENODEV;
644 goto err_input_unregister;
645 }
646
647 if (button->type == ACPI_BUTTON_TYPE_LID) {
648 /*
649 * This assumes there's only one lid device, or if there are
650 * more we only care about the last one...
651 */
652 lid_device = device;
653 }
654
655 device_init_wakeup(dev: &device->dev, enable: true);
656 pr_info("%s [%s]\n", name, acpi_device_bid(device));
657 return 0;
658
659err_input_unregister:
660 input_unregister_device(input);
661err_remove_fs:
662 acpi_button_remove_fs(device);
663err_free_button:
664 kfree(objp: button);
665 return error;
666}
667
668static void acpi_button_remove(struct acpi_device *device)
669{
670 struct acpi_button *button = acpi_driver_data(d: device);
671
672 switch (device->device_type) {
673 case ACPI_BUS_TYPE_POWER_BUTTON:
674 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
675 handler: acpi_button_event);
676 break;
677 case ACPI_BUS_TYPE_SLEEP_BUTTON:
678 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
679 handler: acpi_button_event);
680 break;
681 default:
682 acpi_remove_notify_handler(device: device->handle, ACPI_DEVICE_NOTIFY,
683 handler: button->type == ACPI_BUTTON_TYPE_LID ?
684 acpi_lid_notify :
685 acpi_button_notify);
686 break;
687 }
688 acpi_os_wait_events_complete();
689
690 acpi_button_remove_fs(device);
691 input_unregister_device(button->input);
692 kfree(objp: button);
693}
694
695static int param_set_lid_init_state(const char *val,
696 const struct kernel_param *kp)
697{
698 int i;
699
700 i = sysfs_match_string(lid_init_state_str, val);
701 if (i < 0)
702 return i;
703
704 lid_init_state = i;
705 pr_info("Initial lid state set to '%s'\n", lid_init_state_str[i]);
706 return 0;
707}
708
709static int param_get_lid_init_state(char *buf, const struct kernel_param *kp)
710{
711 int i, c = 0;
712
713 for (i = 0; i < ARRAY_SIZE(lid_init_state_str); i++)
714 if (i == lid_init_state)
715 c += sprintf(buf: buf + c, fmt: "[%s] ", lid_init_state_str[i]);
716 else
717 c += sprintf(buf: buf + c, fmt: "%s ", lid_init_state_str[i]);
718
719 buf[c - 1] = '\n'; /* Replace the final space with a newline */
720
721 return c;
722}
723
724module_param_call(lid_init_state,
725 param_set_lid_init_state, param_get_lid_init_state,
726 NULL, 0644);
727MODULE_PARM_DESC(lid_init_state, "Behavior for reporting LID initial state");
728
729static int acpi_button_register_driver(struct acpi_driver *driver)
730{
731 const struct dmi_system_id *dmi_id;
732
733 if (lid_init_state == -1) {
734 dmi_id = dmi_first_match(list: dmi_lid_quirks);
735 if (dmi_id)
736 lid_init_state = (long)dmi_id->driver_data;
737 else
738 lid_init_state = ACPI_BUTTON_LID_INIT_METHOD;
739 }
740
741 /*
742 * Modules such as nouveau.ko and i915.ko have a link time dependency
743 * on acpi_lid_open(), and would therefore not be loadable on ACPI
744 * capable kernels booted in non-ACPI mode if the return value of
745 * acpi_bus_register_driver() is returned from here with ACPI disabled
746 * when this driver is built as a module.
747 */
748 if (acpi_disabled)
749 return 0;
750
751 return acpi_bus_register_driver(driver);
752}
753
754static void acpi_button_unregister_driver(struct acpi_driver *driver)
755{
756 if (!acpi_disabled)
757 acpi_bus_unregister_driver(driver);
758}
759
760module_driver(acpi_button_driver, acpi_button_register_driver,
761 acpi_button_unregister_driver);
762