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Tip revision: e49d033bddf5b565044e2abe4241353959bc9120 authored by Linus Torvalds on 04 April 2021, 21:15:36 UTC
Linux 5.12-rc6
Linux 5.12-rc6
Tip revision: e49d033
tiny-power-button.c
// 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_remove(struct acpi_device *device)
{
return 0;
}
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,
.remove = acpi_noop_add_remove,
.notify = acpi_tiny_power_button_notify,
},
};
module_acpi_driver(acpi_tiny_power_button_driver);