// SPDX-License-Identifier: GPL-2.0-or-later#include <linux/module.h>#include <linux/sched/signal.h>#include <linux/acpi.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 int acpi_noop_add(struct acpi_device *device){	return 0;} static void acpi_noop_remove(struct acpi_device *device){} static void acpi_tiny_power_button_notify(struct acpi_device *device, u32 event){	kill_cad_pid(power_signal, 1);} static struct acpi_driver acpi_tiny_power_button_driver = {	.name = "tiny-power-button",	.class = "tiny-power-button",	.ids = tiny_power_button_device_ids,	.ops = {		.add = acpi_noop_add,		.remove = acpi_noop_remove,		.notify = acpi_tiny_power_button_notify,	},}; module_acpi_driver(acpi_tiny_power_button_driver);