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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evbug.c (2296B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 *  Copyright (c) 1999-2001 Vojtech Pavlik
      4 */
      5
      6/*
      7 *  Input driver event debug module - dumps all events into syslog
      8 */
      9
     10#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
     11
     12#include <linux/slab.h>
     13#include <linux/module.h>
     14#include <linux/input.h>
     15#include <linux/init.h>
     16#include <linux/device.h>
     17
     18MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
     19MODULE_DESCRIPTION("Input driver event debug module");
     20MODULE_LICENSE("GPL");
     21
     22static void evbug_event(struct input_handle *handle, unsigned int type, unsigned int code, int value)
     23{
     24	printk(KERN_DEBUG pr_fmt("Event. Dev: %s, Type: %d, Code: %d, Value: %d\n"),
     25	       dev_name(&handle->dev->dev), type, code, value);
     26}
     27
     28static int evbug_connect(struct input_handler *handler, struct input_dev *dev,
     29			 const struct input_device_id *id)
     30{
     31	struct input_handle *handle;
     32	int error;
     33
     34	handle = kzalloc(sizeof(struct input_handle), GFP_KERNEL);
     35	if (!handle)
     36		return -ENOMEM;
     37
     38	handle->dev = dev;
     39	handle->handler = handler;
     40	handle->name = "evbug";
     41
     42	error = input_register_handle(handle);
     43	if (error)
     44		goto err_free_handle;
     45
     46	error = input_open_device(handle);
     47	if (error)
     48		goto err_unregister_handle;
     49
     50	printk(KERN_DEBUG pr_fmt("Connected device: %s (%s at %s)\n"),
     51	       dev_name(&dev->dev),
     52	       dev->name ?: "unknown",
     53	       dev->phys ?: "unknown");
     54
     55	return 0;
     56
     57 err_unregister_handle:
     58	input_unregister_handle(handle);
     59 err_free_handle:
     60	kfree(handle);
     61	return error;
     62}
     63
     64static void evbug_disconnect(struct input_handle *handle)
     65{
     66	printk(KERN_DEBUG pr_fmt("Disconnected device: %s\n"),
     67	       dev_name(&handle->dev->dev));
     68
     69	input_close_device(handle);
     70	input_unregister_handle(handle);
     71	kfree(handle);
     72}
     73
     74static const struct input_device_id evbug_ids[] = {
     75	{ .driver_info = 1 },	/* Matches all devices */
     76	{ },			/* Terminating zero entry */
     77};
     78
     79MODULE_DEVICE_TABLE(input, evbug_ids);
     80
     81static struct input_handler evbug_handler = {
     82	.event =	evbug_event,
     83	.connect =	evbug_connect,
     84	.disconnect =	evbug_disconnect,
     85	.name =		"evbug",
     86	.id_table =	evbug_ids,
     87};
     88
     89static int __init evbug_init(void)
     90{
     91	return input_register_handler(&evbug_handler);
     92}
     93
     94static void __exit evbug_exit(void)
     95{
     96	input_unregister_handler(&evbug_handler);
     97}
     98
     99module_init(evbug_init);
    100module_exit(evbug_exit);