1 // SPDX-License-Identifier: GPL-2.0-or-later
3  *  button.c - ACPI Button Driver
9 #define pr_fmt(fmt) "ACPI: button: " fmt
22 #include <acpi/button.h>
24 #define ACPI_BUTTON_CLASS		"button"
30 #define ACPI_BUTTON_DEVICE_NAME_POWER	"Power Button"
34 #define ACPI_BUTTON_DEVICE_NAME_SLEEP	"Sleep Button"
56 MODULE_DESCRIPTION("ACPI Button Driver");
72 		/* GP-electronic T701, _LID method points to a floating GPIO */
160 	.name = "button",
182 static long lid_init_state = -1;
197 	status = acpi_evaluate_integer(device->handle, "_LID", NULL, &lid_state);  in acpi_lid_evaluate_state()
199 		return -ENODEV;  in acpi_lid_evaluate_state()
206 	struct acpi_button *button = acpi_driver_data(device);  in acpi_lid_notify_state()  local
218 	    button->last_state != !!state)  in acpi_lid_notify_state()
223 	next_report = ktime_add(button->last_time,  in acpi_lid_notify_state()
225 	if (button->last_state == !!state &&  in acpi_lid_notify_state()
267 				input_report_switch(button->input,  in acpi_lid_notify_state()
269 				input_sync(button->input);  in acpi_lid_notify_state()
275 		acpi_handle_debug(device->handle, "ACPI LID %s\n",  in acpi_lid_notify_state()
277 		input_report_switch(button->input, SW_LID, !state);  in acpi_lid_notify_state()
278 		input_sync(button->input);  in acpi_lid_notify_state()
279 		button->last_state = !!state;  in acpi_lid_notify_state()
280 		button->last_time = ktime_get();  in acpi_lid_notify_state()
289 	struct acpi_device *device = seq->private;  in acpi_button_state_seq_show()
300 	struct acpi_button *button = acpi_driver_data(device);  in acpi_button_add_fs()  local
305 	if (button->type != ACPI_BUTTON_TYPE_LID)  in acpi_button_add_fs()
310 		return -EEXIST;  in acpi_button_add_fs()
313 	/* create /proc/acpi/button */  in acpi_button_add_fs()
316 		return -ENODEV;  in acpi_button_add_fs()
318 	/* create /proc/acpi/button/lid */  in acpi_button_add_fs()
321 		ret = -ENODEV;  in acpi_button_add_fs()
325 	/* create /proc/acpi/button/lid/LID/ */  in acpi_button_add_fs()
328 		ret = -ENODEV;  in acpi_button_add_fs()
332 	/* create /proc/acpi/button/lid/LID/state */  in acpi_button_add_fs()
337 		ret = -ENODEV;  in acpi_button_add_fs()
359 	struct acpi_button *button = acpi_driver_data(device);  in acpi_button_remove_fs()  local
361 	if (button->type != ACPI_BUTTON_TYPE_LID)  in acpi_button_remove_fs()
381 		return -ENODEV;  in acpi_lid_open()
397 		acpi_pm_wakeup_event(&device->dev);  in acpi_lid_update_state()
404 	struct acpi_button *button = acpi_driver_data(device);  in acpi_lid_initialize_state()  local
418 	button->lid_state_initialized = true;  in acpi_lid_initialize_state()
424 	struct acpi_button *button;  in acpi_lid_notify()  local
427 		acpi_handle_debug(device->handle, "Unsupported event [0x%x]\n",  in acpi_lid_notify()
432 	button = acpi_driver_data(device);  in acpi_lid_notify()
433 	if (!button->lid_state_initialized)  in acpi_lid_notify()
442 	struct acpi_button *button;  in acpi_button_notify()  local
447 		acpi_handle_debug(device->handle, "Unsupported event [0x%x]\n",  in acpi_button_notify()
452 	acpi_pm_wakeup_event(&device->dev);  in acpi_button_notify()
454 	button = acpi_driver_data(device);  in acpi_button_notify()
455 	if (button->suspended)  in acpi_button_notify()
458 	input = button->input;  in acpi_button_notify()
459 	keycode = test_bit(KEY_SLEEP, input->keybit) ? KEY_SLEEP : KEY_POWER;  in acpi_button_notify()
466 	acpi_bus_generate_netlink_event(device->pnp.device_class,  in acpi_button_notify()
467 					dev_name(&device->dev),  in acpi_button_notify()
468 					event, ++button->pushed);  in acpi_button_notify()
486 	struct acpi_button *button = acpi_driver_data(device);  in acpi_button_suspend()  local
488 	button->suspended = true;  in acpi_button_suspend()
496 	struct acpi_button *button = acpi_driver_data(device);  in acpi_button_resume()  local
498 	button->suspended = false;  in acpi_button_resume()
499 	if (button->type == ACPI_BUTTON_TYPE_LID) {  in acpi_button_resume()
500 		button->last_state = !!acpi_lid_evaluate_state(device);  in acpi_button_resume()
501 		button->last_time = ktime_get();  in acpi_button_resume()
505 	if (button->type == ACPI_BUTTON_TYPE_POWER) {  in acpi_button_resume()
506 		input = button->input;  in acpi_button_resume()
519 	struct acpi_button *button = acpi_driver_data(device);  in acpi_lid_input_open()  local
521 	button->last_state = !!acpi_lid_evaluate_state(device);  in acpi_lid_input_open()
522 	button->last_time = ktime_get();  in acpi_lid_input_open()
531 	struct acpi_button *button;  in acpi_button_add()  local
540 		return -ENODEV;  in acpi_button_add()
542 	button = kzalloc(sizeof(struct acpi_button), GFP_KERNEL);  in acpi_button_add()
543 	if (!button)  in acpi_button_add()
544 		return -ENOMEM;  in acpi_button_add()
546 	device->driver_data = button;  in acpi_button_add()
548 	button->input = input = input_allocate_device();  in acpi_button_add()
550 		error = -ENOMEM;  in acpi_button_add()
559 		button->type = ACPI_BUTTON_TYPE_POWER;  in acpi_button_add()
566 		button->type = ACPI_BUTTON_TYPE_SLEEP;  in acpi_button_add()
572 		button->type = ACPI_BUTTON_TYPE_LID;  in acpi_button_add()
577 		input->open = acpi_lid_input_open;  in acpi_button_add()
580 		error = -ENODEV;  in acpi_button_add()
591 	snprintf(button->phys, sizeof(button->phys), "%s/button/input0", hid);  in acpi_button_add()
593 	input->name = name;  in acpi_button_add()
594 	input->phys = button->phys;  in acpi_button_add()
595 	input->id.bustype = BUS_HOST;  in acpi_button_add()
596 	input->id.product = button->type;  in acpi_button_add()
597 	input->dev.parent = &device->dev;  in acpi_button_add()
599 	switch (button->type) {  in acpi_button_add()
619 	switch (device->device_type) {  in acpi_button_add()
631 		status = acpi_install_notify_handler(device->handle,  in acpi_button_add()
637 		error = -ENODEV;  in acpi_button_add()
641 	if (button->type == ACPI_BUTTON_TYPE_LID) {  in acpi_button_add()
649 	device_init_wakeup(&device->dev, true);  in acpi_button_add()
658 	kfree(button);  in acpi_button_add()
664 	struct acpi_button *button = acpi_driver_data(device);  in acpi_button_remove()  local
666 	switch (device->device_type) {  in acpi_button_remove()
676 		acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,  in acpi_button_remove()
677 					   button->type == ACPI_BUTTON_TYPE_LID ?  in acpi_button_remove()
685 	input_unregister_device(button->input);  in acpi_button_remove()
686 	kfree(button);  in acpi_button_remove()
713 	buf[c - 1] = '\n'; /* Replace the final space with a newline */  in param_get_lid_init_state()
727 	if (lid_init_state == -1) {  in acpi_button_register_driver()
730 			lid_init_state = (long)dmi_id->driver_data;  in acpi_button_register_driver()
738 	 * capable kernels booted in non-ACPI mode if the return value of  in acpi_button_register_driver()