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22#define pr_fmt(fmt) "ACPI: button: " fmt
23
24#include <linux/kernel.h>
25#include <linux/module.h>
26#include <linux/init.h>
27#include <linux/types.h>
28#include <linux/proc_fs.h>
29#include <linux/seq_file.h>
30#include <linux/input.h>
31#include <linux/slab.h>
32#include <linux/acpi.h>
33#include <acpi/button.h>
34
35#define PREFIX "ACPI: "
36
37#define ACPI_BUTTON_CLASS "button"
38#define ACPI_BUTTON_FILE_INFO "info"
39#define ACPI_BUTTON_FILE_STATE "state"
40#define ACPI_BUTTON_TYPE_UNKNOWN 0x00
41#define ACPI_BUTTON_NOTIFY_STATUS 0x80
42
43#define ACPI_BUTTON_SUBCLASS_POWER "power"
44#define ACPI_BUTTON_HID_POWER "PNP0C0C"
45#define ACPI_BUTTON_DEVICE_NAME_POWER "Power Button"
46#define ACPI_BUTTON_TYPE_POWER 0x01
47
48#define ACPI_BUTTON_SUBCLASS_SLEEP "sleep"
49#define ACPI_BUTTON_HID_SLEEP "PNP0C0E"
50#define ACPI_BUTTON_DEVICE_NAME_SLEEP "Sleep Button"
51#define ACPI_BUTTON_TYPE_SLEEP 0x03
52
53#define ACPI_BUTTON_SUBCLASS_LID "lid"
54#define ACPI_BUTTON_HID_LID "PNP0C0D"
55#define ACPI_BUTTON_DEVICE_NAME_LID "Lid Switch"
56#define ACPI_BUTTON_TYPE_LID 0x05
57
58#define ACPI_BUTTON_LID_INIT_IGNORE 0x00
59#define ACPI_BUTTON_LID_INIT_OPEN 0x01
60#define ACPI_BUTTON_LID_INIT_METHOD 0x02
61
62#define _COMPONENT ACPI_BUTTON_COMPONENT
63ACPI_MODULE_NAME("button");
64
65MODULE_AUTHOR("Paul Diefenbaugh");
66MODULE_DESCRIPTION("ACPI Button Driver");
67MODULE_LICENSE("GPL");
68
69static const struct acpi_device_id button_device_ids[] = {
70 {ACPI_BUTTON_HID_LID, 0},
71 {ACPI_BUTTON_HID_SLEEP, 0},
72 {ACPI_BUTTON_HID_SLEEPF, 0},
73 {ACPI_BUTTON_HID_POWER, 0},
74 {ACPI_BUTTON_HID_POWERF, 0},
75 {"", 0},
76};
77MODULE_DEVICE_TABLE(acpi, button_device_ids);
78
79static int acpi_button_add(struct acpi_device *device);
80static int acpi_button_remove(struct acpi_device *device);
81static void acpi_button_notify(struct acpi_device *device, u32 event);
82
83#ifdef CONFIG_PM_SLEEP
84static int acpi_button_suspend(struct device *dev);
85static int acpi_button_resume(struct device *dev);
86#else
87#define acpi_button_suspend NULL
88#define acpi_button_resume NULL
89#endif
90static SIMPLE_DEV_PM_OPS(acpi_button_pm, acpi_button_suspend, acpi_button_resume);
91
92static struct acpi_driver acpi_button_driver = {
93 .name = "button",
94 .class = ACPI_BUTTON_CLASS,
95 .ids = button_device_ids,
96 .ops = {
97 .add = acpi_button_add,
98 .remove = acpi_button_remove,
99 .notify = acpi_button_notify,
100 },
101 .drv.pm = &acpi_button_pm,
102};
103
104struct acpi_button {
105 unsigned int type;
106 struct input_dev *input;
107 char phys[32];
108 unsigned long pushed;
109 int last_state;
110 ktime_t last_time;
111 bool suspended;
112};
113
114static BLOCKING_NOTIFIER_HEAD(acpi_lid_notifier);
115static struct acpi_device *lid_device;
116static u8 lid_init_state = ACPI_BUTTON_LID_INIT_METHOD;
117
118static unsigned long lid_report_interval __read_mostly = 500;
119module_param(lid_report_interval, ulong, 0644);
120MODULE_PARM_DESC(lid_report_interval, "Interval (ms) between lid key events");
121
122
123
124
125
126static struct proc_dir_entry *acpi_button_dir;
127static struct proc_dir_entry *acpi_lid_dir;
128
129static int acpi_lid_evaluate_state(struct acpi_device *device)
130{
131 unsigned long long lid_state;
132 acpi_status status;
133
134 status = acpi_evaluate_integer(device->handle, "_LID", NULL, &lid_state);
135 if (ACPI_FAILURE(status))
136 return -ENODEV;
137
138 return lid_state ? 1 : 0;
139}
140
141static int acpi_lid_notify_state(struct acpi_device *device, int state)
142{
143 struct acpi_button *button = acpi_driver_data(device);
144 int ret;
145 ktime_t next_report;
146 bool do_update;
147
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153
154
155 if (lid_init_state != ACPI_BUTTON_LID_INIT_IGNORE ||
156 button->last_state != !!state)
157 do_update = true;
158 else
159 do_update = false;
160
161 next_report = ktime_add(button->last_time,
162 ms_to_ktime(lid_report_interval));
163 if (button->last_state == !!state &&
164 ktime_after(ktime_get(), next_report)) {
165
166 pr_warn_once("The lid device is not compliant to SW_LID.\n");
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193
194 if (lid_init_state == ACPI_BUTTON_LID_INIT_IGNORE) {
195 do_update = true;
196
197
198
199
200
201
202
203
204 if (!state) {
205 input_report_switch(button->input,
206 SW_LID, state);
207 input_sync(button->input);
208 }
209 }
210 }
211
212 if (do_update) {
213 input_report_switch(button->input, SW_LID, !state);
214 input_sync(button->input);
215 button->last_state = !!state;
216 button->last_time = ktime_get();
217 }
218
219 if (state)
220 acpi_pm_wakeup_event(&device->dev);
221
222 ret = blocking_notifier_call_chain(&acpi_lid_notifier, state, device);
223 if (ret == NOTIFY_DONE)
224 ret = blocking_notifier_call_chain(&acpi_lid_notifier, state,
225 device);
226 if (ret == NOTIFY_DONE || ret == NOTIFY_OK) {
227
228
229
230
231 ret = 0;
232 }
233 return ret;
234}
235
236static int acpi_button_state_seq_show(struct seq_file *seq, void *offset)
237{
238 struct acpi_device *device = seq->private;
239 int state;
240
241 state = acpi_lid_evaluate_state(device);
242 seq_printf(seq, "state: %s\n",
243 state < 0 ? "unsupported" : (state ? "open" : "closed"));
244 return 0;
245}
246
247static int acpi_button_state_open_fs(struct inode *inode, struct file *file)
248{
249 return single_open(file, acpi_button_state_seq_show, PDE_DATA(inode));
250}
251
252static const struct file_operations acpi_button_state_fops = {
253 .owner = THIS_MODULE,
254 .open = acpi_button_state_open_fs,
255 .read = seq_read,
256 .llseek = seq_lseek,
257 .release = single_release,
258};
259
260static int acpi_button_add_fs(struct acpi_device *device)
261{
262 struct acpi_button *button = acpi_driver_data(device);
263 struct proc_dir_entry *entry = NULL;
264 int ret = 0;
265
266
267 if (button->type != ACPI_BUTTON_TYPE_LID)
268 return 0;
269
270 if (acpi_button_dir || acpi_lid_dir) {
271 printk(KERN_ERR PREFIX "More than one Lid device found!\n");
272 return -EEXIST;
273 }
274
275
276 acpi_button_dir = proc_mkdir(ACPI_BUTTON_CLASS, acpi_root_dir);
277 if (!acpi_button_dir)
278 return -ENODEV;
279
280
281 acpi_lid_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir);
282 if (!acpi_lid_dir) {
283 ret = -ENODEV;
284 goto remove_button_dir;
285 }
286
287
288 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), acpi_lid_dir);
289 if (!acpi_device_dir(device)) {
290 ret = -ENODEV;
291 goto remove_lid_dir;
292 }
293
294
295 entry = proc_create_data(ACPI_BUTTON_FILE_STATE,
296 S_IRUGO, acpi_device_dir(device),
297 &acpi_button_state_fops, device);
298 if (!entry) {
299 ret = -ENODEV;
300 goto remove_dev_dir;
301 }
302
303done:
304 return ret;
305
306remove_dev_dir:
307 remove_proc_entry(acpi_device_bid(device),
308 acpi_lid_dir);
309 acpi_device_dir(device) = NULL;
310remove_lid_dir:
311 remove_proc_entry(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir);
312 acpi_lid_dir = NULL;
313remove_button_dir:
314 remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);
315 acpi_button_dir = NULL;
316 goto done;
317}
318
319static int acpi_button_remove_fs(struct acpi_device *device)
320{
321 struct acpi_button *button = acpi_driver_data(device);
322
323 if (button->type != ACPI_BUTTON_TYPE_LID)
324 return 0;
325
326 remove_proc_entry(ACPI_BUTTON_FILE_STATE,
327 acpi_device_dir(device));
328 remove_proc_entry(acpi_device_bid(device),
329 acpi_lid_dir);
330 acpi_device_dir(device) = NULL;
331 remove_proc_entry(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir);
332 acpi_lid_dir = NULL;
333 remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);
334 acpi_button_dir = NULL;
335
336 return 0;
337}
338
339
340
341
342int acpi_lid_notifier_register(struct notifier_block *nb)
343{
344 return blocking_notifier_chain_register(&acpi_lid_notifier, nb);
345}
346EXPORT_SYMBOL(acpi_lid_notifier_register);
347
348int acpi_lid_notifier_unregister(struct notifier_block *nb)
349{
350 return blocking_notifier_chain_unregister(&acpi_lid_notifier, nb);
351}
352EXPORT_SYMBOL(acpi_lid_notifier_unregister);
353
354int acpi_lid_open(void)
355{
356 if (!lid_device)
357 return -ENODEV;
358
359 return acpi_lid_evaluate_state(lid_device);
360}
361EXPORT_SYMBOL(acpi_lid_open);
362
363static int acpi_lid_update_state(struct acpi_device *device)
364{
365 int state;
366
367 state = acpi_lid_evaluate_state(device);
368 if (state < 0)
369 return state;
370
371 return acpi_lid_notify_state(device, state);
372}
373
374static void acpi_lid_initialize_state(struct acpi_device *device)
375{
376 switch (lid_init_state) {
377 case ACPI_BUTTON_LID_INIT_OPEN:
378 (void)acpi_lid_notify_state(device, 1);
379 break;
380 case ACPI_BUTTON_LID_INIT_METHOD:
381 (void)acpi_lid_update_state(device);
382 break;
383 case ACPI_BUTTON_LID_INIT_IGNORE:
384 default:
385 break;
386 }
387}
388
389static void acpi_button_notify(struct acpi_device *device, u32 event)
390{
391 struct acpi_button *button = acpi_driver_data(device);
392 struct input_dev *input;
393 int users;
394
395 switch (event) {
396 case ACPI_FIXED_HARDWARE_EVENT:
397 event = ACPI_BUTTON_NOTIFY_STATUS;
398
399 case ACPI_BUTTON_NOTIFY_STATUS:
400 input = button->input;
401 if (button->type == ACPI_BUTTON_TYPE_LID) {
402 mutex_lock(&button->input->mutex);
403 users = button->input->users;
404 mutex_unlock(&button->input->mutex);
405 if (users)
406 acpi_lid_update_state(device);
407 } else {
408 int keycode;
409
410 acpi_pm_wakeup_event(&device->dev);
411 if (button->suspended)
412 break;
413
414 keycode = test_bit(KEY_SLEEP, input->keybit) ?
415 KEY_SLEEP : KEY_POWER;
416 input_report_key(input, keycode, 1);
417 input_sync(input);
418 input_report_key(input, keycode, 0);
419 input_sync(input);
420
421 acpi_bus_generate_netlink_event(
422 device->pnp.device_class,
423 dev_name(&device->dev),
424 event, ++button->pushed);
425 }
426 break;
427 default:
428 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
429 "Unsupported event [0x%x]\n", event));
430 break;
431 }
432}
433
434#ifdef CONFIG_PM_SLEEP
435static int acpi_button_suspend(struct device *dev)
436{
437 struct acpi_device *device = to_acpi_device(dev);
438 struct acpi_button *button = acpi_driver_data(device);
439
440 button->suspended = true;
441 return 0;
442}
443
444static int acpi_button_resume(struct device *dev)
445{
446 struct acpi_device *device = to_acpi_device(dev);
447 struct acpi_button *button = acpi_driver_data(device);
448
449 button->suspended = false;
450 if (button->type == ACPI_BUTTON_TYPE_LID && button->input->users)
451 acpi_lid_initialize_state(device);
452 return 0;
453}
454#endif
455
456static int acpi_lid_input_open(struct input_dev *input)
457{
458 struct acpi_device *device = input_get_drvdata(input);
459 struct acpi_button *button = acpi_driver_data(device);
460
461 button->last_state = !!acpi_lid_evaluate_state(device);
462 button->last_time = ktime_get();
463 acpi_lid_initialize_state(device);
464
465 return 0;
466}
467
468static int acpi_button_add(struct acpi_device *device)
469{
470 struct acpi_button *button;
471 struct input_dev *input;
472 const char *hid = acpi_device_hid(device);
473 char *name, *class;
474 int error;
475
476 button = kzalloc(sizeof(struct acpi_button), GFP_KERNEL);
477 if (!button)
478 return -ENOMEM;
479
480 device->driver_data = button;
481
482 button->input = input = input_allocate_device();
483 if (!input) {
484 error = -ENOMEM;
485 goto err_free_button;
486 }
487
488 name = acpi_device_name(device);
489 class = acpi_device_class(device);
490
491 if (!strcmp(hid, ACPI_BUTTON_HID_POWER) ||
492 !strcmp(hid, ACPI_BUTTON_HID_POWERF)) {
493 button->type = ACPI_BUTTON_TYPE_POWER;
494 strcpy(name, ACPI_BUTTON_DEVICE_NAME_POWER);
495 sprintf(class, "%s/%s",
496 ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_POWER);
497 } else if (!strcmp(hid, ACPI_BUTTON_HID_SLEEP) ||
498 !strcmp(hid, ACPI_BUTTON_HID_SLEEPF)) {
499 button->type = ACPI_BUTTON_TYPE_SLEEP;
500 strcpy(name, ACPI_BUTTON_DEVICE_NAME_SLEEP);
501 sprintf(class, "%s/%s",
502 ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_SLEEP);
503 } else if (!strcmp(hid, ACPI_BUTTON_HID_LID)) {
504 button->type = ACPI_BUTTON_TYPE_LID;
505 strcpy(name, ACPI_BUTTON_DEVICE_NAME_LID);
506 sprintf(class, "%s/%s",
507 ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_LID);
508 input->open = acpi_lid_input_open;
509 } else {
510 printk(KERN_ERR PREFIX "Unsupported hid [%s]\n", hid);
511 error = -ENODEV;
512 goto err_free_input;
513 }
514
515 error = acpi_button_add_fs(device);
516 if (error)
517 goto err_free_input;
518
519 snprintf(button->phys, sizeof(button->phys), "%s/button/input0", hid);
520
521 input->name = name;
522 input->phys = button->phys;
523 input->id.bustype = BUS_HOST;
524 input->id.product = button->type;
525 input->dev.parent = &device->dev;
526
527 switch (button->type) {
528 case ACPI_BUTTON_TYPE_POWER:
529 input_set_capability(input, EV_KEY, KEY_POWER);
530 break;
531
532 case ACPI_BUTTON_TYPE_SLEEP:
533 input_set_capability(input, EV_KEY, KEY_SLEEP);
534 break;
535
536 case ACPI_BUTTON_TYPE_LID:
537 input_set_capability(input, EV_SW, SW_LID);
538 break;
539 }
540
541 input_set_drvdata(input, device);
542 error = input_register_device(input);
543 if (error)
544 goto err_remove_fs;
545 if (button->type == ACPI_BUTTON_TYPE_LID) {
546
547
548
549
550 lid_device = device;
551 }
552
553 device_init_wakeup(&device->dev, true);
554 printk(KERN_INFO PREFIX "%s [%s]\n", name, acpi_device_bid(device));
555 return 0;
556
557 err_remove_fs:
558 acpi_button_remove_fs(device);
559 err_free_input:
560 input_free_device(input);
561 err_free_button:
562 kfree(button);
563 return error;
564}
565
566static int acpi_button_remove(struct acpi_device *device)
567{
568 struct acpi_button *button = acpi_driver_data(device);
569
570 acpi_button_remove_fs(device);
571 input_unregister_device(button->input);
572 kfree(button);
573 return 0;
574}
575
576static int param_set_lid_init_state(const char *val,
577 const struct kernel_param *kp)
578{
579 int result = 0;
580
581 if (!strncmp(val, "open", sizeof("open") - 1)) {
582 lid_init_state = ACPI_BUTTON_LID_INIT_OPEN;
583 pr_info("Notify initial lid state as open\n");
584 } else if (!strncmp(val, "method", sizeof("method") - 1)) {
585 lid_init_state = ACPI_BUTTON_LID_INIT_METHOD;
586 pr_info("Notify initial lid state with _LID return value\n");
587 } else if (!strncmp(val, "ignore", sizeof("ignore") - 1)) {
588 lid_init_state = ACPI_BUTTON_LID_INIT_IGNORE;
589 pr_info("Do not notify initial lid state\n");
590 } else
591 result = -EINVAL;
592 return result;
593}
594
595static int param_get_lid_init_state(char *buffer,
596 const struct kernel_param *kp)
597{
598 switch (lid_init_state) {
599 case ACPI_BUTTON_LID_INIT_OPEN:
600 return sprintf(buffer, "open");
601 case ACPI_BUTTON_LID_INIT_METHOD:
602 return sprintf(buffer, "method");
603 case ACPI_BUTTON_LID_INIT_IGNORE:
604 return sprintf(buffer, "ignore");
605 default:
606 return sprintf(buffer, "invalid");
607 }
608 return 0;
609}
610
611module_param_call(lid_init_state,
612 param_set_lid_init_state, param_get_lid_init_state,
613 NULL, 0644);
614MODULE_PARM_DESC(lid_init_state, "Behavior for reporting LID initial state");
615
616module_acpi_driver(acpi_button_driver);
617