cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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tiny-power-button.c (1190B)

      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_remove(struct acpi_device *device)
     23{
     24	return 0;
     25}
     26
     27static void acpi_tiny_power_button_notify(struct acpi_device *device, u32 event)
     28{
     29	kill_cad_pid(power_signal, 1);
     30}
     31
     32static struct acpi_driver acpi_tiny_power_button_driver = {
     33	.name = "tiny-power-button",
     34	.class = "tiny-power-button",
     35	.ids = tiny_power_button_device_ids,
     36	.ops = {
     37		.add = acpi_noop_add_remove,
     38		.remove = acpi_noop_add_remove,
     39		.notify = acpi_tiny_power_button_notify,
     40	},
     41};
     42
     43module_acpi_driver(acpi_tiny_power_button_driver);