Josh Triplett | a1b93e8 | 2020-02-11 15:38:06 -0800 | [diff] [blame] | 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 | |
Josh Triplett | a1b93e8 | 2020-02-11 15:38:06 -0800 | [diff] [blame] | 7 | MODULE_AUTHOR("Josh Triplett"); |
| 8 | MODULE_DESCRIPTION("ACPI Tiny Power Button Driver"); |
| 9 | MODULE_LICENSE("GPL"); |
| 10 | |
| 11 | static int power_signal __read_mostly = CONFIG_ACPI_TINY_POWER_BUTTON_SIGNAL; |
| 12 | module_param(power_signal, int, 0644); |
| 13 | MODULE_PARM_DESC(power_signal, "Power button sends this signal to init"); |
| 14 | |
| 15 | static 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 | }; |
| 20 | MODULE_DEVICE_TABLE(acpi, tiny_power_button_device_ids); |
| 21 | |
Rafael J. Wysocki | ff1d7ae | 2023-06-04 17:22:48 +0200 | [diff] [blame] | 22 | static void acpi_tiny_power_button_notify(acpi_handle handle, u32 event, void *data) |
Josh Triplett | a1b93e8 | 2020-02-11 15:38:06 -0800 | [diff] [blame] | 23 | { |
Rafael J. Wysocki | ff1d7ae | 2023-06-04 17:22:48 +0200 | [diff] [blame] | 24 | kill_cad_pid(power_signal, 1); |
| 25 | } |
| 26 | |
| 27 | static void acpi_tiny_power_button_notify_run(void *not_used) |
| 28 | { |
| 29 | acpi_tiny_power_button_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, NULL); |
| 30 | } |
| 31 | |
| 32 | static u32 acpi_tiny_power_button_event(void *not_used) |
| 33 | { |
| 34 | acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_tiny_power_button_notify_run, NULL); |
| 35 | return ACPI_INTERRUPT_HANDLED; |
| 36 | } |
| 37 | |
| 38 | static int acpi_tiny_power_button_add(struct acpi_device *device) |
| 39 | { |
| 40 | acpi_status status; |
| 41 | |
| 42 | if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON) { |
| 43 | status = acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON, |
| 44 | acpi_tiny_power_button_event, |
| 45 | NULL); |
| 46 | } else { |
| 47 | status = acpi_install_notify_handler(device->handle, |
| 48 | ACPI_DEVICE_NOTIFY, |
| 49 | acpi_tiny_power_button_notify, |
| 50 | NULL); |
| 51 | } |
| 52 | if (ACPI_FAILURE(status)) |
| 53 | return -ENODEV; |
| 54 | |
Josh Triplett | a1b93e8 | 2020-02-11 15:38:06 -0800 | [diff] [blame] | 55 | return 0; |
| 56 | } |
| 57 | |
Rafael J. Wysocki | ff1d7ae | 2023-06-04 17:22:48 +0200 | [diff] [blame] | 58 | static void acpi_tiny_power_button_remove(struct acpi_device *device) |
Dawei Li | 6c0eb5b | 2022-11-14 00:26:09 +0800 | [diff] [blame] | 59 | { |
Rafael J. Wysocki | ff1d7ae | 2023-06-04 17:22:48 +0200 | [diff] [blame] | 60 | if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON) { |
| 61 | acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON, |
| 62 | acpi_tiny_power_button_event); |
| 63 | } else { |
| 64 | acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY, |
| 65 | acpi_tiny_power_button_notify); |
| 66 | } |
| 67 | acpi_os_wait_events_complete(); |
Josh Triplett | a1b93e8 | 2020-02-11 15:38:06 -0800 | [diff] [blame] | 68 | } |
| 69 | |
| 70 | static struct acpi_driver acpi_tiny_power_button_driver = { |
| 71 | .name = "tiny-power-button", |
| 72 | .class = "tiny-power-button", |
| 73 | .ids = tiny_power_button_device_ids, |
| 74 | .ops = { |
Rafael J. Wysocki | ff1d7ae | 2023-06-04 17:22:48 +0200 | [diff] [blame] | 75 | .add = acpi_tiny_power_button_add, |
| 76 | .remove = acpi_tiny_power_button_remove, |
Josh Triplett | a1b93e8 | 2020-02-11 15:38:06 -0800 | [diff] [blame] | 77 | }, |
| 78 | }; |
| 79 | |
Hanjun Guo | 907cc9f | 2020-11-13 10:26:44 +0800 | [diff] [blame] | 80 | module_acpi_driver(acpi_tiny_power_button_driver); |