Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0-or-later
2#include <linux/module.h>
3#include <linux/sched/signal.h>
4#include <linux/acpi.h>
5#include <acpi/button.h>
6
7ACPI_MODULE_NAME("tiny-power-button");
8MODULE_AUTHOR("Josh Triplett");
9MODULE_DESCRIPTION("ACPI Tiny Power Button Driver");
10MODULE_LICENSE("GPL");
11
12static int power_signal __read_mostly = CONFIG_ACPI_TINY_POWER_BUTTON_SIGNAL;
13module_param(power_signal, int, 0644);
14MODULE_PARM_DESC(power_signal, "Power button sends this signal to init");
15
16static const struct acpi_device_id tiny_power_button_device_ids[] = {
17 { ACPI_BUTTON_HID_POWER, 0 },
18 { ACPI_BUTTON_HID_POWERF, 0 },
19 { "", 0 },
20};
21MODULE_DEVICE_TABLE(acpi, tiny_power_button_device_ids);
22
23static int acpi_noop_add_remove(struct acpi_device *device)
24{
25 return 0;
26}
27
28static void acpi_tiny_power_button_notify(struct acpi_device *device, u32 event)
29{
30 kill_cad_pid(power_signal, 1);
31}
32
33static struct acpi_driver acpi_tiny_power_button_driver = {
34 .name = "tiny-power-button",
35 .class = "tiny-power-button",
36 .ids = tiny_power_button_device_ids,
37 .ops = {
38 .add = acpi_noop_add_remove,
39 .remove = acpi_noop_add_remove,
40 .notify = acpi_tiny_power_button_notify,
41 },
42};
43
44module_driver(acpi_tiny_power_button_driver,
45 acpi_bus_register_driver,
46 acpi_bus_unregister_driver);