// SPDX-License-Identifier: GPL-2.0-or-later /* * Copyright (c) 1999-2001 Vojtech Pavlik */ /* * Input driver event debug module - dumps all events into syslog */ /* */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include <linux/slab.h> #include <linux/module.h> #include <linux/input.h> #include <linux/init.h> #include <linux/device.h> MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); MODULE_DESCRIPTION("Input driver event debug module"); MODULE_LICENSE("GPL"); static void evbug_event(struct input_handle *handle, unsigned int type, unsigned int code, int value) { printk(KERN_DEBUG pr_fmt("Event. Dev: %s, Type: %d, Code: %d, Value: %d\n"), dev_name(&handle->dev->dev), type, code, value); } static int evbug_connect(struct input_handler *handler, struct input_dev *dev, const struct input_device_id *id) { struct input_handle *handle; int error; handle = kzalloc(sizeof(struct input_handle), GFP_KERNEL); if (!handle) return -ENOMEM; handle->dev = dev; handle->handler = handler; handle->name = "evbug"; error = input_register_handle(handle); if (error) goto err_free_handle; error = input_open_device(handle); if (error) goto err_unregister_handle; printk(KERN_DEBUG pr_fmt("Connected device: %s (%s at %s)\n"), dev_name(&dev->dev), dev->name ?: "unknown", dev->phys ?: "unknown"); return 0; err_unregister_handle: input_unregister_handle(handle); err_free_handle: kfree(handle); return error; } static void evbug_disconnect(struct input_handle *handle) { printk(KERN_DEBUG pr_fmt("Disconnected device: %s\n"), dev_name(&handle->dev->dev)); input_close_device(handle); input_unregister_handle(handle); kfree(handle); } static const struct input_device_id evbug_ids[] = { { .driver_info = 1 }, /* Matches all devices */ { }, /* Terminating zero entry */ }; MODULE_DEVICE_TABLE(input, evbug_ids); static struct input_handler evbug_handler = { .event = evbug_event, .connect = evbug_connect, .disconnect = evbug_disconnect, .name = "evbug", .id_table = evbug_ids, }; static int __init evbug_init(void) { return input_register_handler(&evbug_handler); } static void __exit evbug_exit(void) { input_unregister_handler(&evbug_handler); } module_init(evbug_init); module_exit(evbug_exit);