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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>
80 lines
2.2 KiB
C
80 lines
2.2 KiB
C
// 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 void acpi_tiny_power_button_notify(acpi_handle handle, u32 event, void *data)
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{
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kill_cad_pid(power_signal, 1);
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}
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static void acpi_tiny_power_button_notify_run(void *not_used)
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{
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acpi_tiny_power_button_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, NULL);
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}
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static u32 acpi_tiny_power_button_event(void *not_used)
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{
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acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_tiny_power_button_notify_run, NULL);
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return ACPI_INTERRUPT_HANDLED;
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}
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static int acpi_tiny_power_button_add(struct acpi_device *device)
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{
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acpi_status status;
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if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON) {
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status = acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
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acpi_tiny_power_button_event,
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NULL);
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} else {
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status = acpi_install_notify_handler(device->handle,
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ACPI_DEVICE_NOTIFY,
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acpi_tiny_power_button_notify,
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NULL);
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}
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if (ACPI_FAILURE(status))
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return -ENODEV;
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return 0;
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}
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static void acpi_tiny_power_button_remove(struct acpi_device *device)
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{
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if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON) {
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acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
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acpi_tiny_power_button_event);
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} else {
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acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
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acpi_tiny_power_button_notify);
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}
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acpi_os_wait_events_complete();
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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_tiny_power_button_add,
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.remove = acpi_tiny_power_button_remove,
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},
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};
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module_acpi_driver(acpi_tiny_power_button_driver);
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