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// 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 void acpi_tiny_power_button_notify(acpi_handle handle, u32 event, void *data)
{
kill_cad_pid(power_signal, 1);
}
static void acpi_tiny_power_button_notify_run(void *not_used)
{
acpi_tiny_power_button_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, NULL);
}
static u32 acpi_tiny_power_button_event(void *not_used)
{
acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_tiny_power_button_notify_run, NULL);
return ACPI_INTERRUPT_HANDLED;
}
static int acpi_tiny_power_button_add(struct acpi_device *device)
{
acpi_status status;
if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON) {
status = acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
acpi_tiny_power_button_event,
NULL);
} else {
status = acpi_install_notify_handler(device->handle,
ACPI_DEVICE_NOTIFY,
acpi_tiny_power_button_notify,
NULL);
}
if (ACPI_FAILURE(status))
return -ENODEV;
return 0;
}
static void acpi_tiny_power_button_remove(struct acpi_device *device)
{
if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON) {
acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
acpi_tiny_power_button_event);
} else {
acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
acpi_tiny_power_button_notify);
}
acpi_os_wait_events_complete();
}
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_tiny_power_button_add,
.remove = acpi_tiny_power_button_remove,
},
};
module_acpi_driver(acpi_tiny_power_button_driver);
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