// SPDX-License-Identifier: GPL-2.0-or-later#include <linux/acpi.h>#include <linux/module.h>#include <linux/platform_device.h>#include <linux/sched/signal.h>#include <acpi/button.h> MODULE_AUTHOR("Josh Triplett");MODULE_DESCRIPTION("ACPI Tiny Power Button Driver");MODULE_LICENSE("GPL"); static int power_signal __read_mostly = CONFIG_ACPI_TINY_POWER_BUTTON_SIGNAL;module_param(power_signal, int, 0644);MODULE_PARM_DESC(power_signal, "Power button sends this signal to init"); static const struct acpi_device_id tiny_power_button_device_ids[] = {	{ ACPI_BUTTON_HID_POWER, 0 },	{ ACPI_BUTTON_HID_POWERF, 0 },	{ "", 0 },};MODULE_DEVICE_TABLE(acpi, tiny_power_button_device_ids); static void acpi_tiny_power_button_notify(acpi_handle handle, u32 event, void *data){	kill_cad_pid(power_signal, 1);} static void acpi_tiny_power_button_notify_run(void *not_used){	acpi_tiny_power_button_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, NULL);} static u32 acpi_tiny_power_button_event(void *not_used){	acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_tiny_power_button_notify_run, NULL);	return ACPI_INTERRUPT_HANDLED;} static int acpi_tiny_power_button_probe(struct platform_device *pdev){	struct acpi_device *device;	acpi_status status; 	device = ACPI_COMPANION(&pdev->dev);	if (!device)		return -ENODEV; 	if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON) {		status = acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,							  acpi_tiny_power_button_event,							  NULL);	} else {		status = acpi_install_notify_handler(device->handle,						     ACPI_DEVICE_NOTIFY,						     acpi_tiny_power_button_notify,						     NULL);	}	if (ACPI_FAILURE(status))		return -ENODEV; 	return 0;} static void acpi_tiny_power_button_remove(struct platform_device *pdev){	struct acpi_device *device = ACPI_COMPANION(&pdev->dev); 	if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON) {		acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,						acpi_tiny_power_button_event);	} else {		acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,					   acpi_tiny_power_button_notify);	}	acpi_os_wait_events_complete();} static struct platform_driver acpi_tiny_power_button_driver = {	.probe = acpi_tiny_power_button_probe,	.remove = acpi_tiny_power_button_remove,	.driver = {		.name = "acpi-tiny-power-button",		.acpi_match_table = tiny_power_button_device_ids,	},}; module_platform_driver(acpi_tiny_power_button_driver);