1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-or-later
2*4882a593Smuzhiyun #include <linux/module.h>
3*4882a593Smuzhiyun #include <linux/sched/signal.h>
4*4882a593Smuzhiyun #include <linux/acpi.h>
5*4882a593Smuzhiyun #include <acpi/button.h>
6*4882a593Smuzhiyun
7*4882a593Smuzhiyun MODULE_AUTHOR("Josh Triplett");
8*4882a593Smuzhiyun MODULE_DESCRIPTION("ACPI Tiny Power Button Driver");
9*4882a593Smuzhiyun MODULE_LICENSE("GPL");
10*4882a593Smuzhiyun
11*4882a593Smuzhiyun static int power_signal __read_mostly = CONFIG_ACPI_TINY_POWER_BUTTON_SIGNAL;
12*4882a593Smuzhiyun module_param(power_signal, int, 0644);
13*4882a593Smuzhiyun MODULE_PARM_DESC(power_signal, "Power button sends this signal to init");
14*4882a593Smuzhiyun
15*4882a593Smuzhiyun static const struct acpi_device_id tiny_power_button_device_ids[] = {
16*4882a593Smuzhiyun { ACPI_BUTTON_HID_POWER, 0 },
17*4882a593Smuzhiyun { ACPI_BUTTON_HID_POWERF, 0 },
18*4882a593Smuzhiyun { "", 0 },
19*4882a593Smuzhiyun };
20*4882a593Smuzhiyun MODULE_DEVICE_TABLE(acpi, tiny_power_button_device_ids);
21*4882a593Smuzhiyun
acpi_noop_add_remove(struct acpi_device * device)22*4882a593Smuzhiyun static int acpi_noop_add_remove(struct acpi_device *device)
23*4882a593Smuzhiyun {
24*4882a593Smuzhiyun return 0;
25*4882a593Smuzhiyun }
26*4882a593Smuzhiyun
acpi_tiny_power_button_notify(struct acpi_device * device,u32 event)27*4882a593Smuzhiyun static void acpi_tiny_power_button_notify(struct acpi_device *device, u32 event)
28*4882a593Smuzhiyun {
29*4882a593Smuzhiyun kill_cad_pid(power_signal, 1);
30*4882a593Smuzhiyun }
31*4882a593Smuzhiyun
32*4882a593Smuzhiyun static struct acpi_driver acpi_tiny_power_button_driver = {
33*4882a593Smuzhiyun .name = "tiny-power-button",
34*4882a593Smuzhiyun .class = "tiny-power-button",
35*4882a593Smuzhiyun .ids = tiny_power_button_device_ids,
36*4882a593Smuzhiyun .ops = {
37*4882a593Smuzhiyun .add = acpi_noop_add_remove,
38*4882a593Smuzhiyun .remove = acpi_noop_add_remove,
39*4882a593Smuzhiyun .notify = acpi_tiny_power_button_notify,
40*4882a593Smuzhiyun },
41*4882a593Smuzhiyun };
42*4882a593Smuzhiyun
43*4882a593Smuzhiyun module_driver(acpi_tiny_power_button_driver,
44*4882a593Smuzhiyun acpi_bus_register_driver,
45*4882a593Smuzhiyun acpi_bus_unregister_driver);
46