// SPDX-License-Identifier: GPL-2.0-or-later
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#include <linux/module.h>
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#include <linux/sched/signal.h>
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#include <linux/acpi.h>
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#include <acpi/button.h>
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MODULE_AUTHOR("Josh Triplett");
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MODULE_DESCRIPTION("ACPI Tiny Power Button Driver");
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MODULE_LICENSE("GPL");
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static int power_signal __read_mostly = CONFIG_ACPI_TINY_POWER_BUTTON_SIGNAL;
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module_param(power_signal, int, 0644);
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MODULE_PARM_DESC(power_signal, "Power button sends this signal to init");
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static const struct acpi_device_id tiny_power_button_device_ids[] = {
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{ ACPI_BUTTON_HID_POWER, 0 },
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{ ACPI_BUTTON_HID_POWERF, 0 },
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{ "", 0 },
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};
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MODULE_DEVICE_TABLE(acpi, tiny_power_button_device_ids);
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static int acpi_noop_add_remove(struct acpi_device *device)
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{
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return 0;
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}
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static void acpi_tiny_power_button_notify(struct acpi_device *device, u32 event)
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{
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kill_cad_pid(power_signal, 1);
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}
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static struct acpi_driver acpi_tiny_power_button_driver = {
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.name = "tiny-power-button",
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.class = "tiny-power-button",
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.ids = tiny_power_button_device_ids,
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.ops = {
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.add = acpi_noop_add_remove,
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.remove = acpi_noop_add_remove,
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.notify = acpi_tiny_power_button_notify,
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},
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};
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module_driver(acpi_tiny_power_button_driver,
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acpi_bus_register_driver,
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acpi_bus_unregister_driver);
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