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
7MODULE_AUTHOR("Josh Triplett");
8MODULE_DESCRIPTION("ACPI Tiny Power Button Driver");
9MODULE_LICENSE("GPL");
10
11static int power_signal __read_mostly = CONFIG_ACPI_TINY_POWER_BUTTON_SIGNAL;
12module_param(power_signal, int, 0644);
13MODULE_PARM_DESC(power_signal, "Power button sends this signal to init");
14
15static const struct acpi_device_id tiny_power_button_device_ids[] = {
16 { ACPI_BUTTON_HID_POWER, 0 },
17 { ACPI_BUTTON_HID_POWERF, 0 },
18 { "", 0 },
19};
20MODULE_DEVICE_TABLE(acpi, tiny_power_button_device_ids);
21
22static int acpi_noop_add(struct acpi_device *device)
23{
24 return 0;
25}
26
27static void acpi_noop_remove(struct acpi_device *device)
28{
29}
30
31static void acpi_tiny_power_button_notify(struct acpi_device *device, u32 event)
32{
33 kill_cad_pid(power_signal, 1);
34}
35
36static struct acpi_driver acpi_tiny_power_button_driver = {
37 .name = "tiny-power-button",
38 .class = "tiny-power-button",
39 .ids = tiny_power_button_device_ids,
40 .ops = {
41 .add = acpi_noop_add,
42 .remove = acpi_noop_remove,
43 .notify = acpi_tiny_power_button_notify,
44 },
45};
46
47module_acpi_driver(acpi_tiny_power_button_driver);