ff1d7aea83
Rework the ACPI tiny-power-button driver to install a notify handler or a fixed event handler for the device it binds to by itself and drop its notify callback. This will allow acpi_device_install_notify_handler() and acpi_device_remove_notify_handler() to be simplified going forward. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
81 lines
2.2 KiB
C
81 lines
2.2 KiB
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);
|