1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * button.c - ACPI Button Driver
5 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
6 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
9 #define pr_fmt(fmt) "ACPI: button: " fmt
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>
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
29 #define ACPI_BUTTON_SUBCLASS_POWER "power"
30 #define ACPI_BUTTON_DEVICE_NAME_POWER "Power Button"
31 #define ACPI_BUTTON_TYPE_POWER 0x01
33 #define ACPI_BUTTON_SUBCLASS_SLEEP "sleep"
34 #define ACPI_BUTTON_DEVICE_NAME_SLEEP "Sleep Button"
35 #define ACPI_BUTTON_TYPE_SLEEP 0x03
37 #define ACPI_BUTTON_SUBCLASS_LID "lid"
38 #define ACPI_BUTTON_DEVICE_NAME_LID "Lid Switch"
39 #define ACPI_BUTTON_TYPE_LID 0x05
42 ACPI_BUTTON_LID_INIT_IGNORE
,
43 ACPI_BUTTON_LID_INIT_OPEN
,
44 ACPI_BUTTON_LID_INIT_METHOD
,
45 ACPI_BUTTON_LID_INIT_DISABLED
,
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",
55 MODULE_AUTHOR("Paul Diefenbaugh");
56 MODULE_DESCRIPTION("ACPI Button Driver");
57 MODULE_LICENSE("GPL");
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},
67 MODULE_DEVICE_TABLE(acpi
, button_device_ids
);
69 /* Please keep this list sorted alphabetically by vendor and model */
70 static const struct dmi_system_id dmi_lid_quirks
[] = {
72 /* GP-electronic T701, _LID method points to a floating GPIO */
74 DMI_MATCH(DMI_SYS_VENDOR
, "Insyde"),
75 DMI_MATCH(DMI_PRODUCT_NAME
, "T701"),
76 DMI_MATCH(DMI_BIOS_VERSION
, "BYT70A.YNCHENG.WIN.007"),
78 .driver_data
= (void *)(long)ACPI_BUTTON_LID_INIT_DISABLED
,
82 * Medion Akoya E2215T, notification of the LID device only
83 * happens on close, not on open and _LID always returns closed.
86 DMI_MATCH(DMI_SYS_VENDOR
, "MEDION"),
87 DMI_MATCH(DMI_PRODUCT_NAME
, "E2215T"),
89 .driver_data
= (void *)(long)ACPI_BUTTON_LID_INIT_OPEN
,
93 * Medion Akoya E2228T, notification of the LID device only
94 * happens on close, not on open and _LID always returns closed.
97 DMI_MATCH(DMI_SYS_VENDOR
, "MEDION"),
98 DMI_MATCH(DMI_PRODUCT_NAME
, "E2228T"),
100 .driver_data
= (void *)(long)ACPI_BUTTON_LID_INIT_OPEN
,
104 * Razer Blade Stealth 13 late 2019, notification of the LID device
105 * only happens on close, not on open and _LID always returns closed.
108 DMI_MATCH(DMI_SYS_VENDOR
, "Razer"),
109 DMI_MATCH(DMI_PRODUCT_NAME
, "Razer Blade Stealth 13 Late 2019"),
111 .driver_data
= (void *)(long)ACPI_BUTTON_LID_INIT_OPEN
,
116 static int acpi_button_add(struct acpi_device
*device
);
117 static int acpi_button_remove(struct acpi_device
*device
);
118 static void acpi_button_notify(struct acpi_device
*device
, u32 event
);
120 #ifdef CONFIG_PM_SLEEP
121 static int acpi_button_suspend(struct device
*dev
);
122 static int acpi_button_resume(struct device
*dev
);
124 #define acpi_button_suspend NULL
125 #define acpi_button_resume NULL
127 static SIMPLE_DEV_PM_OPS(acpi_button_pm
, acpi_button_suspend
, acpi_button_resume
);
129 static struct acpi_driver acpi_button_driver
= {
131 .class = ACPI_BUTTON_CLASS
,
132 .ids
= button_device_ids
,
134 .add
= acpi_button_add
,
135 .remove
= acpi_button_remove
,
136 .notify
= acpi_button_notify
,
138 .drv
.pm
= &acpi_button_pm
,
143 struct input_dev
*input
;
144 char phys
[32]; /* for input device */
145 unsigned long pushed
;
149 bool lid_state_initialized
;
152 static struct acpi_device
*lid_device
;
153 static long lid_init_state
= -1;
155 static unsigned long lid_report_interval __read_mostly
= 500;
156 module_param(lid_report_interval
, ulong
, 0644);
157 MODULE_PARM_DESC(lid_report_interval
, "Interval (ms) between lid key events");
159 /* FS Interface (/proc) */
160 static struct proc_dir_entry
*acpi_button_dir
;
161 static struct proc_dir_entry
*acpi_lid_dir
;
163 static int acpi_lid_evaluate_state(struct acpi_device
*device
)
165 unsigned long long lid_state
;
168 status
= acpi_evaluate_integer(device
->handle
, "_LID", NULL
, &lid_state
);
169 if (ACPI_FAILURE(status
))
172 return lid_state
? 1 : 0;
175 static int acpi_lid_notify_state(struct acpi_device
*device
, int state
)
177 struct acpi_button
*button
= acpi_driver_data(device
);
182 * In lid_init_state=ignore mode, if user opens/closes lid
183 * frequently with "open" missing, and "last_time" is also updated
184 * frequently, "close" cannot be delivered to the userspace.
185 * So "last_time" is only updated after a timeout or an actual
188 if (lid_init_state
!= ACPI_BUTTON_LID_INIT_IGNORE
||
189 button
->last_state
!= !!state
)
194 next_report
= ktime_add(button
->last_time
,
195 ms_to_ktime(lid_report_interval
));
196 if (button
->last_state
== !!state
&&
197 ktime_after(ktime_get(), next_report
)) {
198 /* Complain the buggy firmware */
199 pr_warn_once("The lid device is not compliant to SW_LID.\n");
202 * Send the unreliable complement switch event:
204 * On most platforms, the lid device is reliable. However
205 * there are exceptions:
206 * 1. Platforms returning initial lid state as "close" by
207 * default after booting/resuming:
208 * https://bugzilla.kernel.org/show_bug.cgi?id=89211
209 * https://bugzilla.kernel.org/show_bug.cgi?id=106151
210 * 2. Platforms never reporting "open" events:
211 * https://bugzilla.kernel.org/show_bug.cgi?id=106941
212 * On these buggy platforms, the usage model of the ACPI
213 * lid device actually is:
214 * 1. The initial returning value of _LID may not be
216 * 2. The open event may not be reliable.
217 * 3. The close event is reliable.
219 * But SW_LID is typed as input switch event, the input
220 * layer checks if the event is redundant. Hence if the
221 * state is not switched, the userspace cannot see this
222 * platform triggered reliable event. By inserting a
223 * complement switch event, it then is guaranteed that the
224 * platform triggered reliable one can always be seen by
227 if (lid_init_state
== ACPI_BUTTON_LID_INIT_IGNORE
) {
230 * Do generate complement switch event for "close"
231 * as "close" is reliable and wrong "open" won't
232 * trigger unexpected behaviors.
233 * Do not generate complement switch event for
234 * "open" as "open" is not reliable and wrong
235 * "close" will trigger unexpected behaviors.
238 input_report_switch(button
->input
,
240 input_sync(button
->input
);
244 /* Send the platform triggered reliable event */
246 acpi_handle_debug(device
->handle
, "ACPI LID %s\n",
247 state
? "open" : "closed");
248 input_report_switch(button
->input
, SW_LID
, !state
);
249 input_sync(button
->input
);
250 button
->last_state
= !!state
;
251 button
->last_time
= ktime_get();
257 static int __maybe_unused
acpi_button_state_seq_show(struct seq_file
*seq
,
260 struct acpi_device
*device
= seq
->private;
263 state
= acpi_lid_evaluate_state(device
);
264 seq_printf(seq
, "state: %s\n",
265 state
< 0 ? "unsupported" : (state
? "open" : "closed"));
269 static int acpi_button_add_fs(struct acpi_device
*device
)
271 struct acpi_button
*button
= acpi_driver_data(device
);
272 struct proc_dir_entry
*entry
= NULL
;
275 /* procfs I/F for ACPI lid device only */
276 if (button
->type
!= ACPI_BUTTON_TYPE_LID
)
279 if (acpi_button_dir
|| acpi_lid_dir
) {
280 pr_info("More than one Lid device found!\n");
284 /* create /proc/acpi/button */
285 acpi_button_dir
= proc_mkdir(ACPI_BUTTON_CLASS
, acpi_root_dir
);
286 if (!acpi_button_dir
)
289 /* create /proc/acpi/button/lid */
290 acpi_lid_dir
= proc_mkdir(ACPI_BUTTON_SUBCLASS_LID
, acpi_button_dir
);
293 goto remove_button_dir
;
296 /* create /proc/acpi/button/lid/LID/ */
297 acpi_device_dir(device
) = proc_mkdir(acpi_device_bid(device
), acpi_lid_dir
);
298 if (!acpi_device_dir(device
)) {
303 /* create /proc/acpi/button/lid/LID/state */
304 entry
= proc_create_single_data(ACPI_BUTTON_FILE_STATE
, S_IRUGO
,
305 acpi_device_dir(device
), acpi_button_state_seq_show
,
316 remove_proc_entry(acpi_device_bid(device
),
318 acpi_device_dir(device
) = NULL
;
320 remove_proc_entry(ACPI_BUTTON_SUBCLASS_LID
, acpi_button_dir
);
323 remove_proc_entry(ACPI_BUTTON_CLASS
, acpi_root_dir
);
324 acpi_button_dir
= NULL
;
328 static int acpi_button_remove_fs(struct acpi_device
*device
)
330 struct acpi_button
*button
= acpi_driver_data(device
);
332 if (button
->type
!= ACPI_BUTTON_TYPE_LID
)
335 remove_proc_entry(ACPI_BUTTON_FILE_STATE
,
336 acpi_device_dir(device
));
337 remove_proc_entry(acpi_device_bid(device
),
339 acpi_device_dir(device
) = NULL
;
340 remove_proc_entry(ACPI_BUTTON_SUBCLASS_LID
, acpi_button_dir
);
342 remove_proc_entry(ACPI_BUTTON_CLASS
, acpi_root_dir
);
343 acpi_button_dir
= NULL
;
348 /* Driver Interface */
349 int acpi_lid_open(void)
354 return acpi_lid_evaluate_state(lid_device
);
356 EXPORT_SYMBOL(acpi_lid_open
);
358 static int acpi_lid_update_state(struct acpi_device
*device
,
363 state
= acpi_lid_evaluate_state(device
);
367 if (state
&& signal_wakeup
)
368 acpi_pm_wakeup_event(&device
->dev
);
370 return acpi_lid_notify_state(device
, state
);
373 static void acpi_lid_initialize_state(struct acpi_device
*device
)
375 struct acpi_button
*button
= acpi_driver_data(device
);
377 switch (lid_init_state
) {
378 case ACPI_BUTTON_LID_INIT_OPEN
:
379 (void)acpi_lid_notify_state(device
, 1);
381 case ACPI_BUTTON_LID_INIT_METHOD
:
382 (void)acpi_lid_update_state(device
, false);
384 case ACPI_BUTTON_LID_INIT_IGNORE
:
389 button
->lid_state_initialized
= true;
392 static void acpi_button_notify(struct acpi_device
*device
, u32 event
)
394 struct acpi_button
*button
= acpi_driver_data(device
);
395 struct input_dev
*input
;
398 case ACPI_FIXED_HARDWARE_EVENT
:
399 event
= ACPI_BUTTON_NOTIFY_STATUS
;
401 case ACPI_BUTTON_NOTIFY_STATUS
:
402 input
= button
->input
;
403 if (button
->type
== ACPI_BUTTON_TYPE_LID
) {
404 if (button
->lid_state_initialized
)
405 acpi_lid_update_state(device
, true);
409 acpi_pm_wakeup_event(&device
->dev
);
410 if (button
->suspended
)
413 keycode
= test_bit(KEY_SLEEP
, input
->keybit
) ?
414 KEY_SLEEP
: KEY_POWER
;
415 input_report_key(input
, keycode
, 1);
417 input_report_key(input
, keycode
, 0);
420 acpi_bus_generate_netlink_event(
421 device
->pnp
.device_class
,
422 dev_name(&device
->dev
),
423 event
, ++button
->pushed
);
427 acpi_handle_debug(device
->handle
, "Unsupported event [0x%x]\n",
433 #ifdef CONFIG_PM_SLEEP
434 static int acpi_button_suspend(struct device
*dev
)
436 struct acpi_device
*device
= to_acpi_device(dev
);
437 struct acpi_button
*button
= acpi_driver_data(device
);
439 button
->suspended
= true;
443 static int acpi_button_resume(struct device
*dev
)
445 struct acpi_device
*device
= to_acpi_device(dev
);
446 struct acpi_button
*button
= acpi_driver_data(device
);
448 button
->suspended
= false;
449 if (button
->type
== ACPI_BUTTON_TYPE_LID
) {
450 button
->last_state
= !!acpi_lid_evaluate_state(device
);
451 button
->last_time
= ktime_get();
452 acpi_lid_initialize_state(device
);
458 static int acpi_lid_input_open(struct input_dev
*input
)
460 struct acpi_device
*device
= input_get_drvdata(input
);
461 struct acpi_button
*button
= acpi_driver_data(device
);
463 button
->last_state
= !!acpi_lid_evaluate_state(device
);
464 button
->last_time
= ktime_get();
465 acpi_lid_initialize_state(device
);
470 static int acpi_button_add(struct acpi_device
*device
)
472 struct acpi_button
*button
;
473 struct input_dev
*input
;
474 const char *hid
= acpi_device_hid(device
);
478 if (!strcmp(hid
, ACPI_BUTTON_HID_LID
) &&
479 lid_init_state
== ACPI_BUTTON_LID_INIT_DISABLED
)
482 button
= kzalloc(sizeof(struct acpi_button
), GFP_KERNEL
);
486 device
->driver_data
= button
;
488 button
->input
= input
= input_allocate_device();
491 goto err_free_button
;
494 name
= acpi_device_name(device
);
495 class = acpi_device_class(device
);
497 if (!strcmp(hid
, ACPI_BUTTON_HID_POWER
) ||
498 !strcmp(hid
, ACPI_BUTTON_HID_POWERF
)) {
499 button
->type
= ACPI_BUTTON_TYPE_POWER
;
500 strcpy(name
, ACPI_BUTTON_DEVICE_NAME_POWER
);
501 sprintf(class, "%s/%s",
502 ACPI_BUTTON_CLASS
, ACPI_BUTTON_SUBCLASS_POWER
);
503 } else if (!strcmp(hid
, ACPI_BUTTON_HID_SLEEP
) ||
504 !strcmp(hid
, ACPI_BUTTON_HID_SLEEPF
)) {
505 button
->type
= ACPI_BUTTON_TYPE_SLEEP
;
506 strcpy(name
, ACPI_BUTTON_DEVICE_NAME_SLEEP
);
507 sprintf(class, "%s/%s",
508 ACPI_BUTTON_CLASS
, ACPI_BUTTON_SUBCLASS_SLEEP
);
509 } else if (!strcmp(hid
, ACPI_BUTTON_HID_LID
)) {
510 button
->type
= ACPI_BUTTON_TYPE_LID
;
511 strcpy(name
, ACPI_BUTTON_DEVICE_NAME_LID
);
512 sprintf(class, "%s/%s",
513 ACPI_BUTTON_CLASS
, ACPI_BUTTON_SUBCLASS_LID
);
514 input
->open
= acpi_lid_input_open
;
516 pr_info("Unsupported hid [%s]\n", hid
);
521 error
= acpi_button_add_fs(device
);
525 snprintf(button
->phys
, sizeof(button
->phys
), "%s/button/input0", hid
);
528 input
->phys
= button
->phys
;
529 input
->id
.bustype
= BUS_HOST
;
530 input
->id
.product
= button
->type
;
531 input
->dev
.parent
= &device
->dev
;
533 switch (button
->type
) {
534 case ACPI_BUTTON_TYPE_POWER
:
535 input_set_capability(input
, EV_KEY
, KEY_POWER
);
538 case ACPI_BUTTON_TYPE_SLEEP
:
539 input_set_capability(input
, EV_KEY
, KEY_SLEEP
);
542 case ACPI_BUTTON_TYPE_LID
:
543 input_set_capability(input
, EV_SW
, SW_LID
);
547 input_set_drvdata(input
, device
);
548 error
= input_register_device(input
);
551 if (button
->type
== ACPI_BUTTON_TYPE_LID
) {
553 * This assumes there's only one lid device, or if there are
554 * more we only care about the last one...
559 device_init_wakeup(&device
->dev
, true);
560 pr_info("%s [%s]\n", name
, acpi_device_bid(device
));
564 acpi_button_remove_fs(device
);
566 input_free_device(input
);
572 static int acpi_button_remove(struct acpi_device
*device
)
574 struct acpi_button
*button
= acpi_driver_data(device
);
576 acpi_button_remove_fs(device
);
577 input_unregister_device(button
->input
);
582 static int param_set_lid_init_state(const char *val
,
583 const struct kernel_param
*kp
)
587 i
= sysfs_match_string(lid_init_state_str
, val
);
592 pr_info("Initial lid state set to '%s'\n", lid_init_state_str
[i
]);
596 static int param_get_lid_init_state(char *buf
, const struct kernel_param
*kp
)
600 for (i
= 0; i
< ARRAY_SIZE(lid_init_state_str
); i
++)
601 if (i
== lid_init_state
)
602 c
+= sprintf(buf
+ c
, "[%s] ", lid_init_state_str
[i
]);
604 c
+= sprintf(buf
+ c
, "%s ", lid_init_state_str
[i
]);
606 buf
[c
- 1] = '\n'; /* Replace the final space with a newline */
611 module_param_call(lid_init_state
,
612 param_set_lid_init_state
, param_get_lid_init_state
,
614 MODULE_PARM_DESC(lid_init_state
, "Behavior for reporting LID initial state");
616 static int acpi_button_register_driver(struct acpi_driver
*driver
)
618 const struct dmi_system_id
*dmi_id
;
620 if (lid_init_state
== -1) {
621 dmi_id
= dmi_first_match(dmi_lid_quirks
);
623 lid_init_state
= (long)dmi_id
->driver_data
;
625 lid_init_state
= ACPI_BUTTON_LID_INIT_METHOD
;
629 * Modules such as nouveau.ko and i915.ko have a link time dependency
630 * on acpi_lid_open(), and would therefore not be loadable on ACPI
631 * capable kernels booted in non-ACPI mode if the return value of
632 * acpi_bus_register_driver() is returned from here with ACPI disabled
633 * when this driver is built as a module.
638 return acpi_bus_register_driver(driver
);
641 static void acpi_button_unregister_driver(struct acpi_driver
*driver
)
644 acpi_bus_unregister_driver(driver
);
647 module_driver(acpi_button_driver
, acpi_button_register_driver
,
648 acpi_button_unregister_driver
);