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 <linux/platform_device.h>
23 #include <acpi/button.h>
24
25 #define ACPI_BUTTON_CLASS "button"
26 #define ACPI_BUTTON_FILE_STATE "state"
27 #define ACPI_BUTTON_TYPE_UNKNOWN 0x00
28 #define ACPI_BUTTON_NOTIFY_WAKE 0x02
29 #define ACPI_BUTTON_NOTIFY_STATUS 0x80
30
31 #define ACPI_BUTTON_SUBCLASS_POWER "power"
32 #define ACPI_BUTTON_DEVICE_NAME_POWER "Power Button"
33 #define ACPI_BUTTON_TYPE_POWER 0x01
34
35 #define ACPI_BUTTON_SUBCLASS_SLEEP "sleep"
36 #define ACPI_BUTTON_DEVICE_NAME_SLEEP "Sleep Button"
37 #define ACPI_BUTTON_TYPE_SLEEP 0x03
38
39 #define ACPI_BUTTON_SUBCLASS_LID "lid"
40 #define ACPI_BUTTON_DEVICE_NAME_LID "Lid Switch"
41 #define ACPI_BUTTON_TYPE_LID 0x05
42
43 enum {
44 ACPI_BUTTON_LID_INIT_IGNORE,
45 ACPI_BUTTON_LID_INIT_OPEN,
46 ACPI_BUTTON_LID_INIT_METHOD,
47 ACPI_BUTTON_LID_INIT_DISABLED,
48 };
49
50 static const char * const lid_init_state_str[] = {
51 [ACPI_BUTTON_LID_INIT_IGNORE] = "ignore",
52 [ACPI_BUTTON_LID_INIT_OPEN] = "open",
53 [ACPI_BUTTON_LID_INIT_METHOD] = "method",
54 [ACPI_BUTTON_LID_INIT_DISABLED] = "disabled",
55 };
56
57 MODULE_AUTHOR("Paul Diefenbaugh");
58 MODULE_DESCRIPTION("ACPI Button Driver");
59 MODULE_LICENSE("GPL");
60
61 static const struct acpi_device_id button_device_ids[] = {
62 {ACPI_BUTTON_HID_LID, 0},
63 {ACPI_BUTTON_HID_SLEEP, 0},
64 {ACPI_BUTTON_HID_SLEEPF, 0},
65 {ACPI_BUTTON_HID_POWER, 0},
66 {ACPI_BUTTON_HID_POWERF, 0},
67 {"", 0},
68 };
69 MODULE_DEVICE_TABLE(acpi, button_device_ids);
70
71 /* Please keep this list sorted alphabetically by vendor and model */
72 static const struct dmi_system_id dmi_lid_quirks[] = {
73 {
74 /* GP-electronic T701, _LID method points to a floating GPIO */
75 .matches = {
76 DMI_MATCH(DMI_SYS_VENDOR, "Insyde"),
77 DMI_MATCH(DMI_PRODUCT_NAME, "T701"),
78 DMI_MATCH(DMI_BIOS_VERSION, "BYT70A.YNCHENG.WIN.007"),
79 },
80 .driver_data = (void *)(long)ACPI_BUTTON_LID_INIT_DISABLED,
81 },
82 {
83 /* Nextbook Ares 8A tablet, _LID device always reports lid closed */
84 .matches = {
85 DMI_MATCH(DMI_SYS_VENDOR, "Insyde"),
86 DMI_MATCH(DMI_PRODUCT_NAME, "CherryTrail"),
87 DMI_MATCH(DMI_BIOS_VERSION, "M882"),
88 },
89 .driver_data = (void *)(long)ACPI_BUTTON_LID_INIT_DISABLED,
90 },
91 {
92 /*
93 * Lenovo Yoga 9 14ITL5, initial notification of the LID device
94 * never happens.
95 */
96 .matches = {
97 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
98 DMI_MATCH(DMI_PRODUCT_NAME, "82BG"),
99 },
100 .driver_data = (void *)(long)ACPI_BUTTON_LID_INIT_OPEN,
101 },
102 {
103 /*
104 * Medion Akoya E2215T, notification of the LID device only
105 * happens on close, not on open and _LID always returns closed.
106 */
107 .matches = {
108 DMI_MATCH(DMI_SYS_VENDOR, "MEDION"),
109 DMI_MATCH(DMI_PRODUCT_NAME, "E2215T"),
110 },
111 .driver_data = (void *)(long)ACPI_BUTTON_LID_INIT_OPEN,
112 },
113 {
114 /*
115 * Medion Akoya E2228T, notification of the LID device only
116 * happens on close, not on open and _LID always returns closed.
117 */
118 .matches = {
119 DMI_MATCH(DMI_SYS_VENDOR, "MEDION"),
120 DMI_MATCH(DMI_PRODUCT_NAME, "E2228T"),
121 },
122 .driver_data = (void *)(long)ACPI_BUTTON_LID_INIT_OPEN,
123 },
124 {
125 /*
126 * Razer Blade Stealth 13 late 2019, notification of the LID device
127 * only happens on close, not on open and _LID always returns closed.
128 */
129 .matches = {
130 DMI_MATCH(DMI_SYS_VENDOR, "Razer"),
131 DMI_MATCH(DMI_PRODUCT_NAME, "Razer Blade Stealth 13 Late 2019"),
132 },
133 .driver_data = (void *)(long)ACPI_BUTTON_LID_INIT_OPEN,
134 },
135 {
136 /*
137 * Samsung galaxybook2 ,initial _LID device notification returns
138 * lid closed.
139 */
140 .matches = {
141 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
142 DMI_MATCH(DMI_PRODUCT_NAME, "750XED"),
143 },
144 .driver_data = (void *)(long)ACPI_BUTTON_LID_INIT_OPEN,
145 },
146 {}
147 };
148
149 static int acpi_button_probe(struct platform_device *pdev);
150 static void acpi_button_remove(struct platform_device *pdev);
151
152 #ifdef CONFIG_PM_SLEEP
153 static int acpi_button_suspend(struct device *dev);
154 static int acpi_button_resume(struct device *dev);
155 #else
156 #define acpi_button_suspend NULL
157 #define acpi_button_resume NULL
158 #endif
159 static SIMPLE_DEV_PM_OPS(acpi_button_pm, acpi_button_suspend, acpi_button_resume);
160
161 static struct platform_driver acpi_button_driver = {
162 .probe = acpi_button_probe,
163 .remove = acpi_button_remove,
164 .driver = {
165 .name = "acpi-button",
166 .acpi_match_table = button_device_ids,
167 .pm = &acpi_button_pm,
168 },
169 };
170
171 struct acpi_button {
172 struct acpi_device *adev;
173 struct device *dev; /* physical button device */
174 unsigned int type;
175 struct input_dev *input;
176 char phys[32]; /* for input device */
177 unsigned long pushed;
178 int last_state;
179 ktime_t last_time;
180 bool suspended;
181 bool lid_state_initialized;
182 };
183
184 static struct acpi_device *lid_device;
185 static long lid_init_state = -1;
186
187 static unsigned long lid_report_interval __read_mostly = 500;
188 module_param(lid_report_interval, ulong, 0644);
189 MODULE_PARM_DESC(lid_report_interval, "Interval (ms) between lid key events");
190
191 /* FS Interface (/proc) */
192 static struct proc_dir_entry *acpi_button_dir;
193 static struct proc_dir_entry *acpi_lid_dir;
194
acpi_lid_evaluate_state(struct acpi_device * device)195 static int acpi_lid_evaluate_state(struct acpi_device *device)
196 {
197 unsigned long long lid_state;
198 acpi_status status;
199
200 status = acpi_evaluate_integer(device->handle, "_LID", NULL, &lid_state);
201 if (ACPI_FAILURE(status))
202 return -ENODEV;
203
204 return lid_state ? 1 : 0;
205 }
206
acpi_lid_notify_state(struct acpi_button * button,int state)207 static int acpi_lid_notify_state(struct acpi_button *button, int state)
208 {
209 struct acpi_device *device = button->adev;
210 ktime_t next_report;
211 bool do_update;
212
213 /*
214 * In lid_init_state=ignore mode, if user opens/closes lid
215 * frequently with "open" missing, and "last_time" is also updated
216 * frequently, "close" cannot be delivered to the userspace.
217 * So "last_time" is only updated after a timeout or an actual
218 * switch.
219 */
220 if (lid_init_state != ACPI_BUTTON_LID_INIT_IGNORE ||
221 button->last_state != !!state)
222 do_update = true;
223 else
224 do_update = false;
225
226 next_report = ktime_add(button->last_time,
227 ms_to_ktime(lid_report_interval));
228 if (button->last_state == !!state &&
229 ktime_after(ktime_get(), next_report)) {
230 /* Complain the buggy firmware */
231 pr_warn_once("The lid device is not compliant to SW_LID.\n");
232
233 /*
234 * Send the unreliable complement switch event:
235 *
236 * On most platforms, the lid device is reliable. However
237 * there are exceptions:
238 * 1. Platforms returning initial lid state as "close" by
239 * default after booting/resuming:
240 * https://bugzilla.kernel.org/show_bug.cgi?id=89211
241 * https://bugzilla.kernel.org/show_bug.cgi?id=106151
242 * 2. Platforms never reporting "open" events:
243 * https://bugzilla.kernel.org/show_bug.cgi?id=106941
244 * On these buggy platforms, the usage model of the ACPI
245 * lid device actually is:
246 * 1. The initial returning value of _LID may not be
247 * reliable.
248 * 2. The open event may not be reliable.
249 * 3. The close event is reliable.
250 *
251 * But SW_LID is typed as input switch event, the input
252 * layer checks if the event is redundant. Hence if the
253 * state is not switched, the userspace cannot see this
254 * platform triggered reliable event. By inserting a
255 * complement switch event, it then is guaranteed that the
256 * platform triggered reliable one can always be seen by
257 * the userspace.
258 */
259 if (lid_init_state == ACPI_BUTTON_LID_INIT_IGNORE) {
260 do_update = true;
261 /*
262 * Do generate complement switch event for "close"
263 * as "close" is reliable and wrong "open" won't
264 * trigger unexpected behaviors.
265 * Do not generate complement switch event for
266 * "open" as "open" is not reliable and wrong
267 * "close" will trigger unexpected behaviors.
268 */
269 if (!state) {
270 input_report_switch(button->input,
271 SW_LID, state);
272 input_sync(button->input);
273 }
274 }
275 }
276 /* Send the platform triggered reliable event */
277 if (do_update) {
278 acpi_handle_debug(device->handle, "ACPI LID %s\n",
279 state ? "open" : "closed");
280 input_report_switch(button->input, SW_LID, !state);
281 input_sync(button->input);
282 button->last_state = !!state;
283 button->last_time = ktime_get();
284 }
285
286 return 0;
287 }
288
acpi_button_state_seq_show(struct seq_file * seq,void * offset)289 static int __maybe_unused acpi_button_state_seq_show(struct seq_file *seq,
290 void *offset)
291 {
292 struct acpi_button *button = seq->private;
293 int state;
294
295 state = acpi_lid_evaluate_state(button->adev);
296 seq_printf(seq, "state: %s\n",
297 state < 0 ? "unsupported" : (state ? "open" : "closed"));
298 return 0;
299 }
300
acpi_button_add_fs(struct acpi_button * button)301 static int acpi_button_add_fs(struct acpi_button *button)
302 {
303 struct acpi_device *device = button->adev;
304 struct proc_dir_entry *entry = NULL;
305 int ret = 0;
306
307 /* procfs I/F for ACPI lid device only */
308 if (button->type != ACPI_BUTTON_TYPE_LID)
309 return 0;
310
311 if (acpi_button_dir || acpi_lid_dir) {
312 pr_info("More than one Lid device found!\n");
313 return -EEXIST;
314 }
315
316 /* create /proc/acpi/button */
317 acpi_button_dir = proc_mkdir(ACPI_BUTTON_CLASS, acpi_root_dir);
318 if (!acpi_button_dir)
319 return -ENODEV;
320
321 /* create /proc/acpi/button/lid */
322 acpi_lid_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir);
323 if (!acpi_lid_dir) {
324 ret = -ENODEV;
325 goto remove_button_dir;
326 }
327
328 /* create /proc/acpi/button/lid/LID/ */
329 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), acpi_lid_dir);
330 if (!acpi_device_dir(device)) {
331 ret = -ENODEV;
332 goto remove_lid_dir;
333 }
334
335 /* create /proc/acpi/button/lid/LID/state */
336 entry = proc_create_single_data(ACPI_BUTTON_FILE_STATE, S_IRUGO,
337 acpi_device_dir(device), acpi_button_state_seq_show,
338 button);
339 if (!entry) {
340 ret = -ENODEV;
341 goto remove_dev_dir;
342 }
343
344 done:
345 return ret;
346
347 remove_dev_dir:
348 remove_proc_entry(acpi_device_bid(device),
349 acpi_lid_dir);
350 acpi_device_dir(device) = NULL;
351 remove_lid_dir:
352 remove_proc_entry(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir);
353 acpi_lid_dir = NULL;
354 remove_button_dir:
355 remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);
356 acpi_button_dir = NULL;
357 goto done;
358 }
359
acpi_button_remove_fs(struct acpi_button * button)360 static int acpi_button_remove_fs(struct acpi_button *button)
361 {
362 struct acpi_device *device = button->adev;
363
364 if (button->type != ACPI_BUTTON_TYPE_LID)
365 return 0;
366
367 remove_proc_entry(ACPI_BUTTON_FILE_STATE,
368 acpi_device_dir(device));
369 remove_proc_entry(acpi_device_bid(device),
370 acpi_lid_dir);
371 acpi_device_dir(device) = NULL;
372 remove_proc_entry(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir);
373 acpi_lid_dir = NULL;
374 remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);
375 acpi_button_dir = NULL;
376
377 return 0;
378 }
379
380 /* Driver Interface */
acpi_lid_open(void)381 int acpi_lid_open(void)
382 {
383 if (!lid_device)
384 return -ENODEV;
385
386 return acpi_lid_evaluate_state(lid_device);
387 }
388 EXPORT_SYMBOL(acpi_lid_open);
389
acpi_lid_update_state(struct acpi_button * button,bool signal_wakeup)390 static int acpi_lid_update_state(struct acpi_button *button,
391 bool signal_wakeup)
392 {
393 struct acpi_device *device = button->adev;
394 int state;
395
396 state = acpi_lid_evaluate_state(device);
397 if (state < 0)
398 return state;
399
400 if (state && signal_wakeup)
401 acpi_pm_wakeup_event(button->dev);
402
403 return acpi_lid_notify_state(button, state);
404 }
405
acpi_lid_initialize_state(struct acpi_button * button)406 static void acpi_lid_initialize_state(struct acpi_button *button)
407 {
408 switch (lid_init_state) {
409 case ACPI_BUTTON_LID_INIT_OPEN:
410 (void)acpi_lid_notify_state(button, 1);
411 break;
412 case ACPI_BUTTON_LID_INIT_METHOD:
413 (void)acpi_lid_update_state(button, false);
414 break;
415 case ACPI_BUTTON_LID_INIT_IGNORE:
416 default:
417 break;
418 }
419
420 button->lid_state_initialized = true;
421 }
422
acpi_lid_notify(acpi_handle handle,u32 event,void * data)423 static void acpi_lid_notify(acpi_handle handle, u32 event, void *data)
424 {
425 struct acpi_button *button = data;
426 struct acpi_device *device = button->adev;
427
428 if (event != ACPI_BUTTON_NOTIFY_STATUS) {
429 acpi_handle_debug(device->handle, "Unsupported event [0x%x]\n",
430 event);
431 return;
432 }
433
434 if (!button->lid_state_initialized)
435 return;
436
437 acpi_lid_update_state(button, true);
438 }
439
acpi_button_notify(acpi_handle handle,u32 event,void * data)440 static void acpi_button_notify(acpi_handle handle, u32 event, void *data)
441 {
442 struct acpi_button *button = data;
443 struct acpi_device *device = button->adev;
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(button->dev);
459
460 if (button->suspended || event == ACPI_BUTTON_NOTIFY_WAKE)
461 return;
462
463 input = button->input;
464 keycode = test_bit(KEY_SLEEP, input->keybit) ? KEY_SLEEP : KEY_POWER;
465
466 input_report_key(input, keycode, 1);
467 input_sync(input);
468 input_report_key(input, keycode, 0);
469 input_sync(input);
470
471 acpi_bus_generate_netlink_event(device->pnp.device_class,
472 dev_name(&device->dev),
473 event, ++button->pushed);
474 }
475
acpi_button_notify_run(void * data)476 static void acpi_button_notify_run(void *data)
477 {
478 acpi_button_notify(NULL, ACPI_BUTTON_NOTIFY_STATUS, data);
479 }
480
acpi_button_event(void * data)481 static u32 acpi_button_event(void *data)
482 {
483 acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_button_notify_run, data);
484 return ACPI_INTERRUPT_HANDLED;
485 }
486
487 #ifdef CONFIG_PM_SLEEP
acpi_button_suspend(struct device * dev)488 static int acpi_button_suspend(struct device *dev)
489 {
490 struct acpi_button *button = dev_get_drvdata(dev);
491
492 button->suspended = true;
493 return 0;
494 }
495
acpi_button_resume(struct device * dev)496 static int acpi_button_resume(struct device *dev)
497 {
498 struct acpi_button *button = dev_get_drvdata(dev);
499 struct acpi_device *device = ACPI_COMPANION(dev);
500 struct input_dev *input;
501
502 button->suspended = false;
503 if (button->type == ACPI_BUTTON_TYPE_LID) {
504 button->last_state = !!acpi_lid_evaluate_state(device);
505 button->last_time = ktime_get();
506 acpi_lid_initialize_state(button);
507 }
508
509 if (button->type == ACPI_BUTTON_TYPE_POWER) {
510 input = button->input;
511 input_report_key(input, KEY_WAKEUP, 1);
512 input_sync(input);
513 input_report_key(input, KEY_WAKEUP, 0);
514 input_sync(input);
515 }
516 return 0;
517 }
518 #endif
519
acpi_lid_input_open(struct input_dev * input)520 static int acpi_lid_input_open(struct input_dev *input)
521 {
522 struct acpi_button *button = input_get_drvdata(input);
523 struct acpi_device *device = button->adev;
524
525 button->last_state = !!acpi_lid_evaluate_state(device);
526 button->last_time = ktime_get();
527 acpi_lid_initialize_state(button);
528
529 return 0;
530 }
531
acpi_button_probe(struct platform_device * pdev)532 static int acpi_button_probe(struct platform_device *pdev)
533 {
534 struct acpi_device *device = ACPI_COMPANION(&pdev->dev);
535 acpi_notify_handler handler;
536 struct acpi_button *button;
537 struct input_dev *input;
538 const char *hid = acpi_device_hid(device);
539 acpi_status status;
540 char *name, *class;
541 int error = 0;
542
543 if (!strcmp(hid, ACPI_BUTTON_HID_LID) &&
544 lid_init_state == ACPI_BUTTON_LID_INIT_DISABLED)
545 return -ENODEV;
546
547 button = kzalloc(sizeof(struct acpi_button), GFP_KERNEL);
548 if (!button)
549 return -ENOMEM;
550
551 platform_set_drvdata(pdev, button);
552
553 button->dev = &pdev->dev;
554 button->adev = device;
555 button->input = input = input_allocate_device();
556 if (!input) {
557 error = -ENOMEM;
558 goto err_free_button;
559 }
560
561 name = acpi_device_name(device);
562 class = acpi_device_class(device);
563
564 if (!strcmp(hid, ACPI_BUTTON_HID_POWER) ||
565 !strcmp(hid, ACPI_BUTTON_HID_POWERF)) {
566 button->type = ACPI_BUTTON_TYPE_POWER;
567 handler = acpi_button_notify;
568 strscpy(name, ACPI_BUTTON_DEVICE_NAME_POWER, MAX_ACPI_DEVICE_NAME_LEN);
569 sprintf(class, "%s/%s",
570 ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_POWER);
571 } else if (!strcmp(hid, ACPI_BUTTON_HID_SLEEP) ||
572 !strcmp(hid, ACPI_BUTTON_HID_SLEEPF)) {
573 button->type = ACPI_BUTTON_TYPE_SLEEP;
574 handler = acpi_button_notify;
575 strscpy(name, ACPI_BUTTON_DEVICE_NAME_SLEEP, MAX_ACPI_DEVICE_NAME_LEN);
576 sprintf(class, "%s/%s",
577 ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_SLEEP);
578 } else if (!strcmp(hid, ACPI_BUTTON_HID_LID)) {
579 button->type = ACPI_BUTTON_TYPE_LID;
580 handler = acpi_lid_notify;
581 strscpy(name, ACPI_BUTTON_DEVICE_NAME_LID, MAX_ACPI_DEVICE_NAME_LEN);
582 sprintf(class, "%s/%s",
583 ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_LID);
584 input->open = acpi_lid_input_open;
585 } else {
586 pr_info("Unsupported hid [%s]\n", hid);
587 error = -ENODEV;
588 }
589
590 if (!error)
591 error = acpi_button_add_fs(button);
592
593 if (error) {
594 input_free_device(input);
595 goto err_free_button;
596 }
597
598 snprintf(button->phys, sizeof(button->phys), "%s/button/input0", hid);
599
600 input->name = name;
601 input->phys = button->phys;
602 input->id.bustype = BUS_HOST;
603 input->id.product = button->type;
604 input->dev.parent = &pdev->dev;
605
606 switch (button->type) {
607 case ACPI_BUTTON_TYPE_POWER:
608 input_set_capability(input, EV_KEY, KEY_POWER);
609 input_set_capability(input, EV_KEY, KEY_WAKEUP);
610 break;
611
612 case ACPI_BUTTON_TYPE_SLEEP:
613 input_set_capability(input, EV_KEY, KEY_SLEEP);
614 break;
615
616 case ACPI_BUTTON_TYPE_LID:
617 input_set_capability(input, EV_SW, SW_LID);
618 break;
619 }
620
621 input_set_drvdata(input, button);
622 error = input_register_device(input);
623 if (error) {
624 input_free_device(input);
625 goto err_remove_fs;
626 }
627
628 device_init_wakeup(button->dev, true);
629
630 switch (device->device_type) {
631 case ACPI_BUS_TYPE_POWER_BUTTON:
632 status = acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
633 acpi_button_event,
634 button);
635 break;
636 case ACPI_BUS_TYPE_SLEEP_BUTTON:
637 status = acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
638 acpi_button_event,
639 button);
640 break;
641 default:
642 status = acpi_install_notify_handler(device->handle,
643 ACPI_ALL_NOTIFY, handler,
644 button);
645 break;
646 }
647 if (ACPI_FAILURE(status)) {
648 error = -ENODEV;
649 goto err_input_unregister;
650 }
651
652 if (button->type == ACPI_BUTTON_TYPE_LID) {
653 /*
654 * This assumes there's only one lid device, or if there are
655 * more we only care about the last one...
656 */
657 lid_device = device;
658 }
659
660 pr_info("%s [%s]\n", name, acpi_device_bid(device));
661 return 0;
662
663 err_input_unregister:
664 device_init_wakeup(button->dev, false);
665 input_unregister_device(input);
666 err_remove_fs:
667 acpi_button_remove_fs(button);
668 err_free_button:
669 kfree(button);
670 return error;
671 }
672
acpi_button_remove(struct platform_device * pdev)673 static void acpi_button_remove(struct platform_device *pdev)
674 {
675 struct acpi_button *button = platform_get_drvdata(pdev);
676 struct acpi_device *adev = button->adev;
677
678 switch (adev->device_type) {
679 case ACPI_BUS_TYPE_POWER_BUTTON:
680 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
681 acpi_button_event);
682 break;
683 case ACPI_BUS_TYPE_SLEEP_BUTTON:
684 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
685 acpi_button_event);
686 break;
687 default:
688 acpi_remove_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY,
689 button->type == ACPI_BUTTON_TYPE_LID ?
690 acpi_lid_notify :
691 acpi_button_notify);
692 break;
693 }
694 acpi_os_wait_events_complete();
695
696 device_init_wakeup(button->dev, false);
697
698 acpi_button_remove_fs(button);
699 input_unregister_device(button->input);
700 kfree(button);
701 }
702
param_set_lid_init_state(const char * val,const struct kernel_param * kp)703 static int param_set_lid_init_state(const char *val,
704 const struct kernel_param *kp)
705 {
706 int i;
707
708 i = sysfs_match_string(lid_init_state_str, val);
709 if (i < 0)
710 return i;
711
712 lid_init_state = i;
713 pr_info("Initial lid state set to '%s'\n", lid_init_state_str[i]);
714 return 0;
715 }
716
param_get_lid_init_state(char * buf,const struct kernel_param * kp)717 static int param_get_lid_init_state(char *buf, const struct kernel_param *kp)
718 {
719 int i, c = 0;
720
721 for (i = 0; i < ARRAY_SIZE(lid_init_state_str); i++)
722 if (i == lid_init_state)
723 c += sprintf(buf + c, "[%s] ", lid_init_state_str[i]);
724 else
725 c += sprintf(buf + c, "%s ", lid_init_state_str[i]);
726
727 buf[c - 1] = '\n'; /* Replace the final space with a newline */
728
729 return c;
730 }
731
732 module_param_call(lid_init_state,
733 param_set_lid_init_state, param_get_lid_init_state,
734 NULL, 0644);
735 MODULE_PARM_DESC(lid_init_state, "Behavior for reporting LID initial state");
736
acpi_button_init(void)737 static int __init acpi_button_init(void)
738 {
739 const struct dmi_system_id *dmi_id;
740
741 if (lid_init_state == -1) {
742 dmi_id = dmi_first_match(dmi_lid_quirks);
743 if (dmi_id)
744 lid_init_state = (long)dmi_id->driver_data;
745 else
746 lid_init_state = ACPI_BUTTON_LID_INIT_METHOD;
747 }
748
749 /*
750 * Modules such as nouveau.ko and i915.ko have a link time dependency
751 * on acpi_lid_open(), and would therefore not be loadable on ACPI
752 * capable kernels booted in non-ACPI mode if the return value of
753 * platform_driver_register() is returned from here with ACPI disabled
754 * when this driver is built as a module.
755 */
756 if (acpi_disabled)
757 return 0;
758
759 return platform_driver_register(&acpi_button_driver);
760 }
761
acpi_button_exit(void)762 static void __exit acpi_button_exit(void)
763 {
764 if (!acpi_disabled)
765 platform_driver_unregister(&acpi_button_driver);
766 }
767
768 module_init(acpi_button_init);
769 module_exit(acpi_button_exit);
770