[linux-2.6-block.git] / drivers / acpi / tiny-power-button.c

// 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);
Commit	Line	Data
a1b93e89 JT	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
a1b93e89 JT	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
ff1d7aea	22	static void acpi_tiny_power_button_notify(acpi_handle handle, u32 event, void *data)
a1b93e89	23	{
ff1d7aea	24	kill_cad_pid(power_signal, 1);
a1b93e89 JT	25	}
a1b93e89 JT	26
ff1d7aea	27	static void acpi_tiny_power_button_notify_run(void *not_used)
6c0eb5ba	28	{
ff1d7aea	29	acpi_tiny_power_button_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, NULL);
6c0eb5ba DL	30	}
6c0eb5ba DL	31
ff1d7aea	32	static u32 acpi_tiny_power_button_event(void *not_used)
a1b93e89	33	{
ff1d7aea RW	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
	55	return 0;
	56	}
	57
	58	static void acpi_tiny_power_button_remove(struct acpi_device *device)
	59	{
	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();
a1b93e89 JT	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 = {
ff1d7aea RW	75	.add = acpi_tiny_power_button_add,
ff1d7aea RW	76	.remove = acpi_tiny_power_button_remove,
a1b93e89 JT	77	},
	78	};
	79
907cc9fe	80	module_acpi_driver(acpi_tiny_power_button_driver);