LXR linux/drivers/acpi/tiny-power-button.c

   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);
  44