1a1b93e89SJosh Triplett // SPDX-License-Identifier: GPL-2.0-or-later
2a1b93e89SJosh Triplett #include <linux/module.h>
3a1b93e89SJosh Triplett #include <linux/sched/signal.h>
4a1b93e89SJosh Triplett #include <linux/acpi.h>
5a1b93e89SJosh Triplett #include <acpi/button.h>
6a1b93e89SJosh Triplett
7a1b93e89SJosh Triplett MODULE_AUTHOR("Josh Triplett");
8a1b93e89SJosh Triplett MODULE_DESCRIPTION("ACPI Tiny Power Button Driver");
9a1b93e89SJosh Triplett MODULE_LICENSE("GPL");
10a1b93e89SJosh Triplett
11a1b93e89SJosh Triplett static int power_signal __read_mostly = CONFIG_ACPI_TINY_POWER_BUTTON_SIGNAL;
12a1b93e89SJosh Triplett module_param(power_signal, int, 0644);
13a1b93e89SJosh Triplett MODULE_PARM_DESC(power_signal, "Power button sends this signal to init");
14a1b93e89SJosh Triplett
15a1b93e89SJosh Triplett static const struct acpi_device_id tiny_power_button_device_ids[] = {
16a1b93e89SJosh Triplett { ACPI_BUTTON_HID_POWER, 0 },
17a1b93e89SJosh Triplett { ACPI_BUTTON_HID_POWERF, 0 },
18a1b93e89SJosh Triplett { "", 0 },
19a1b93e89SJosh Triplett };
20a1b93e89SJosh Triplett MODULE_DEVICE_TABLE(acpi, tiny_power_button_device_ids);
21a1b93e89SJosh Triplett
acpi_tiny_power_button_notify(acpi_handle handle,u32 event,void * data)22*ff1d7aeaSRafael J. Wysocki static void acpi_tiny_power_button_notify(acpi_handle handle, u32 event, void *data)
23a1b93e89SJosh Triplett {
24*ff1d7aeaSRafael J. Wysocki kill_cad_pid(power_signal, 1);
25*ff1d7aeaSRafael J. Wysocki }
26*ff1d7aeaSRafael J. Wysocki
acpi_tiny_power_button_notify_run(void * not_used)27*ff1d7aeaSRafael J. Wysocki static void acpi_tiny_power_button_notify_run(void *not_used)
28*ff1d7aeaSRafael J. Wysocki {
29*ff1d7aeaSRafael J. Wysocki acpi_tiny_power_button_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, NULL);
30*ff1d7aeaSRafael J. Wysocki }
31*ff1d7aeaSRafael J. Wysocki
acpi_tiny_power_button_event(void * not_used)32*ff1d7aeaSRafael J. Wysocki static u32 acpi_tiny_power_button_event(void *not_used)
33*ff1d7aeaSRafael J. Wysocki {
34*ff1d7aeaSRafael J. Wysocki acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_tiny_power_button_notify_run, NULL);
35*ff1d7aeaSRafael J. Wysocki return ACPI_INTERRUPT_HANDLED;
36*ff1d7aeaSRafael J. Wysocki }
37*ff1d7aeaSRafael J. Wysocki
acpi_tiny_power_button_add(struct acpi_device * device)38*ff1d7aeaSRafael J. Wysocki static int acpi_tiny_power_button_add(struct acpi_device *device)
39*ff1d7aeaSRafael J. Wysocki {
40*ff1d7aeaSRafael J. Wysocki acpi_status status;
41*ff1d7aeaSRafael J. Wysocki
42*ff1d7aeaSRafael J. Wysocki if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON) {
43*ff1d7aeaSRafael J. Wysocki status = acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
44*ff1d7aeaSRafael J. Wysocki acpi_tiny_power_button_event,
45*ff1d7aeaSRafael J. Wysocki NULL);
46*ff1d7aeaSRafael J. Wysocki } else {
47*ff1d7aeaSRafael J. Wysocki status = acpi_install_notify_handler(device->handle,
48*ff1d7aeaSRafael J. Wysocki ACPI_DEVICE_NOTIFY,
49*ff1d7aeaSRafael J. Wysocki acpi_tiny_power_button_notify,
50*ff1d7aeaSRafael J. Wysocki NULL);
51*ff1d7aeaSRafael J. Wysocki }
52*ff1d7aeaSRafael J. Wysocki if (ACPI_FAILURE(status))
53*ff1d7aeaSRafael J. Wysocki return -ENODEV;
54*ff1d7aeaSRafael J. Wysocki
55a1b93e89SJosh Triplett return 0;
56a1b93e89SJosh Triplett }
57a1b93e89SJosh Triplett
acpi_tiny_power_button_remove(struct acpi_device * device)58*ff1d7aeaSRafael J. Wysocki static void acpi_tiny_power_button_remove(struct acpi_device *device)
596c0eb5baSDawei Li {
60*ff1d7aeaSRafael J. Wysocki if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON) {
61*ff1d7aeaSRafael J. Wysocki acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
62*ff1d7aeaSRafael J. Wysocki acpi_tiny_power_button_event);
63*ff1d7aeaSRafael J. Wysocki } else {
64*ff1d7aeaSRafael J. Wysocki acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
65*ff1d7aeaSRafael J. Wysocki acpi_tiny_power_button_notify);
666c0eb5baSDawei Li }
67*ff1d7aeaSRafael J. Wysocki acpi_os_wait_events_complete();
68a1b93e89SJosh Triplett }
69a1b93e89SJosh Triplett
70a1b93e89SJosh Triplett static struct acpi_driver acpi_tiny_power_button_driver = {
71a1b93e89SJosh Triplett .name = "tiny-power-button",
72a1b93e89SJosh Triplett .class = "tiny-power-button",
73a1b93e89SJosh Triplett .ids = tiny_power_button_device_ids,
74a1b93e89SJosh Triplett .ops = {
75*ff1d7aeaSRafael J. Wysocki .add = acpi_tiny_power_button_add,
76*ff1d7aeaSRafael J. Wysocki .remove = acpi_tiny_power_button_remove,
77a1b93e89SJosh Triplett },
78a1b93e89SJosh Triplett };
79a1b93e89SJosh Triplett
80907cc9feSHanjun Guo module_acpi_driver(acpi_tiny_power_button_driver);
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