Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0-only
/*
 * PEAQ 2-in-1 WMI hotkey driver
 * Copyright (C) 2017 Hans de Goede <hdegoede@redhat.com>
 */
 
#include <linux/acpi.h>
#include <linux/dmi.h>
#include <linux/input.h>
#include <linux/kernel.h>
#include <linux/module.h>
 
#define PEAQ_DOLBY_BUTTON_GUID		"ABBC0F6F-8EA1-11D1-00A0-C90629100000"
#define PEAQ_DOLBY_BUTTON_METHOD_ID	5
#define PEAQ_POLL_INTERVAL_MS		250
#define PEAQ_POLL_IGNORE_MS		500
#define PEAQ_POLL_MAX_MS		1000
 
MODULE_ALIAS("wmi:"PEAQ_DOLBY_BUTTON_GUID);
 
static struct input_dev *peaq_poll_dev;
 
/*
 * The Dolby button (yes really a Dolby button) causes an ACPI variable to get
 * set on both press and release. The WMI method checks and clears that flag.
 * So for a press + release we will get back One from the WMI method either once
 * (if polling after the release) or twice (polling between press and release).
 * We ignore events for 0.5s after the first event to avoid reporting 2 presses.
 */
static void peaq_wmi_poll(struct input_dev *input_dev)
{
<------>static unsigned long last_event_time;
<------>static bool had_events;
<------>union acpi_object obj;
<------>acpi_status status;
<------>u32 dummy = 0;
 
<------>struct acpi_buffer input = { sizeof(dummy), &dummy };
<------>struct acpi_buffer output = { sizeof(obj), &obj };
 
<------>status = wmi_evaluate_method(PEAQ_DOLBY_BUTTON_GUID, 0,
<------><------><------><------>     PEAQ_DOLBY_BUTTON_METHOD_ID,
<------><------><------><------>     &input, &output);
<------>if (ACPI_FAILURE(status))
<------><------>return;
 
<------>if (obj.type != ACPI_TYPE_INTEGER) {
<------><------>dev_err(&input_dev->dev,
<------><------><------>"Error WMBC did not return an integer\n");
<------><------>return;
<------>}
 
<------>if (!obj.integer.value)
<------><------>return;
 
<------>if (had_events && time_before(jiffies, last_event_time +
<------><------><------><------><------>msecs_to_jiffies(PEAQ_POLL_IGNORE_MS)))
<------><------>return;
 
<------>input_event(input_dev, EV_KEY, KEY_SOUND, 1);
<------>input_sync(input_dev);
<------>input_event(input_dev, EV_KEY, KEY_SOUND, 0);
<------>input_sync(input_dev);
 
<------>last_event_time = jiffies;
<------>had_events = true;
}
 
/* Some other devices (Shuttle XS35) use the same WMI GUID for other purposes */
static const struct dmi_system_id peaq_dmi_table[] __initconst = {
<------>{
<------><------>.matches = {
<------><------><------>DMI_MATCH(DMI_SYS_VENDOR, "PEAQ"),
<------><------><------>DMI_MATCH(DMI_PRODUCT_NAME, "PEAQ PMM C1010 MD99187"),
<------><------>},
<------>},
<------>{}
};
 
static int __init peaq_wmi_init(void)
{
<------>int err;
 
<------>/* WMI GUID is not unique, also check for a DMI match */
<------>if (!dmi_check_system(peaq_dmi_table))
<------><------>return -ENODEV;
 
<------>if (!wmi_has_guid(PEAQ_DOLBY_BUTTON_GUID))
<------><------>return -ENODEV;
 
<------>peaq_poll_dev = input_allocate_device();
<------>if (!peaq_poll_dev)
<------><------>return -ENOMEM;
 
<------>peaq_poll_dev->name = "PEAQ WMI hotkeys";
<------>peaq_poll_dev->phys = "wmi/input0";
<------>peaq_poll_dev->id.bustype = BUS_HOST;
<------>input_set_capability(peaq_poll_dev, EV_KEY, KEY_SOUND);
 
<------>err = input_setup_polling(peaq_poll_dev, peaq_wmi_poll);
<------>if (err)
<------><------>goto err_out;
 
<------>input_set_poll_interval(peaq_poll_dev, PEAQ_POLL_INTERVAL_MS);
<------>input_set_max_poll_interval(peaq_poll_dev, PEAQ_POLL_MAX_MS);
 
<------>err = input_register_device(peaq_poll_dev);
<------>if (err)
<------><------>goto err_out;
 
<------>return 0;
 
err_out:
<------>input_free_device(peaq_poll_dev);
<------>return err;
}
 
static void __exit peaq_wmi_exit(void)
{
<------>input_unregister_device(peaq_poll_dev);
}
 
module_init(peaq_wmi_init);
module_exit(peaq_wmi_exit);
 
MODULE_DESCRIPTION("PEAQ 2-in-1 WMI hotkey driver");
MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
MODULE_LICENSE("GPL");