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 18 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); 19 MODULE_DESCRIPTION("Input driver event debug module"); 20 MODULE_LICENSE("GPL"); 21 22 static 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 28 static 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 64 static 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 74 static const struct input_device_id evbug_ids[] = { 75 { .driver_info = 1 }, /* Matches all devices */ 76 { }, /* Terminating zero entry */ 77 }; 78 79 MODULE_DEVICE_TABLE(input, evbug_ids); 80 81 static 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 89 static int __init evbug_init(void) 90 { 91 return input_register_handler(&evbug_handler); 92 } 93 94 static void __exit evbug_exit(void) 95 { 96 input_unregister_handler(&evbug_handler); 97 } 98 99 module_init(evbug_init); 100 module_exit(evbug_exit); 101