cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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wireless-hotkey.c (2070B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 *  Airplane mode button for AMD, HP & Xiaomi laptops
      4 *
      5 *  Copyright (C) 2014-2017 Alex Hung <alex.hung@canonical.com>
      6 *  Copyright (C) 2021 Advanced Micro Devices
      7 */
      8
      9#include <linux/kernel.h>
     10#include <linux/module.h>
     11#include <linux/init.h>
     12#include <linux/input.h>
     13#include <linux/platform_device.h>
     14#include <linux/acpi.h>
     15#include <acpi/acpi_bus.h>
     16
     17MODULE_LICENSE("GPL");
     18MODULE_AUTHOR("Alex Hung");
     19MODULE_ALIAS("acpi*:HPQ6001:*");
     20MODULE_ALIAS("acpi*:WSTADEF:*");
     21MODULE_ALIAS("acpi*:AMDI0051:*");
     22
     23static struct input_dev *wl_input_dev;
     24
     25static const struct acpi_device_id wl_ids[] = {
     26	{"HPQ6001", 0},
     27	{"WSTADEF", 0},
     28	{"AMDI0051", 0},
     29	{"", 0},
     30};
     31
     32static int wireless_input_setup(void)
     33{
     34	int err;
     35
     36	wl_input_dev = input_allocate_device();
     37	if (!wl_input_dev)
     38		return -ENOMEM;
     39
     40	wl_input_dev->name = "Wireless hotkeys";
     41	wl_input_dev->phys = "hpq6001/input0";
     42	wl_input_dev->id.bustype = BUS_HOST;
     43	wl_input_dev->evbit[0] = BIT(EV_KEY);
     44	set_bit(KEY_RFKILL, wl_input_dev->keybit);
     45
     46	err = input_register_device(wl_input_dev);
     47	if (err)
     48		goto err_free_dev;
     49
     50	return 0;
     51
     52err_free_dev:
     53	input_free_device(wl_input_dev);
     54	return err;
     55}
     56
     57static void wireless_input_destroy(void)
     58{
     59	input_unregister_device(wl_input_dev);
     60}
     61
     62static void wl_notify(struct acpi_device *acpi_dev, u32 event)
     63{
     64	if (event != 0x80) {
     65		pr_info("Received unknown event (0x%x)\n", event);
     66		return;
     67	}
     68
     69	input_report_key(wl_input_dev, KEY_RFKILL, 1);
     70	input_sync(wl_input_dev);
     71	input_report_key(wl_input_dev, KEY_RFKILL, 0);
     72	input_sync(wl_input_dev);
     73}
     74
     75static int wl_add(struct acpi_device *device)
     76{
     77	int err;
     78
     79	err = wireless_input_setup();
     80	if (err)
     81		pr_err("Failed to setup wireless hotkeys\n");
     82
     83	return err;
     84}
     85
     86static int wl_remove(struct acpi_device *device)
     87{
     88	wireless_input_destroy();
     89	return 0;
     90}
     91
     92static struct acpi_driver wl_driver = {
     93	.name	= "wireless-hotkey",
     94	.owner	= THIS_MODULE,
     95	.ids	= wl_ids,
     96	.ops	= {
     97		.add	= wl_add,
     98		.remove	= wl_remove,
     99		.notify	= wl_notify,
    100	},
    101};
    102
    103module_acpi_driver(wl_driver);