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 /* 11 */ 12 13 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 14 15 #include <linux/slab.h> 16 #include <linux/module.h> 17 #include <linux/input.h> 18 #include <linux/init.h> 19 #include <linux/device.h> 20 21 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); 22 MODULE_DESCRIPTION("Input driver event debug module"); 23 MODULE_LICENSE("GPL"); 24 25 static void evbug_event(struct input_handle *handle, unsigned int type, unsigned int code, int value) 26 { 27 printk(KERN_DEBUG pr_fmt("Event. Dev: %s, Type: %d, Code: %d, Value: %d\n"), 28 dev_name(&handle->dev->dev), type, code, value); 29 } 30 31 static int evbug_connect(struct input_handler *handler, struct input_dev *dev, 32 const struct input_device_id *id) 33 { 34 struct input_handle *handle; 35 int error; 36 37 handle = kzalloc(sizeof(struct input_handle), GFP_KERNEL); 38 if (!handle) 39 return -ENOMEM; 40 41 handle->dev = dev; 42 handle->handler = handler; 43 handle->name = "evbug"; 44 45 error = input_register_handle(handle); 46 if (error) 47 goto err_free_handle; 48 49 error = input_open_device(handle); 50 if (error) 51 goto err_unregister_handle; 52 53 printk(KERN_DEBUG pr_fmt("Connected device: %s (%s at %s)\n"), 54 dev_name(&dev->dev), 55 dev->name ?: "unknown", 56 dev->phys ?: "unknown"); 57 58 return 0; 59 60 err_unregister_handle: 61 input_unregister_handle(handle); 62 err_free_handle: 63 kfree(handle); 64 return error; 65 } 66 67 static void evbug_disconnect(struct input_handle *handle) 68 { 69 printk(KERN_DEBUG pr_fmt("Disconnected device: %s\n"), 70 dev_name(&handle->dev->dev)); 71 72 input_close_device(handle); 73 input_unregister_handle(handle); 74 kfree(handle); 75 } 76 77 static const struct input_device_id evbug_ids[] = { 78 { .driver_info = 1 }, /* Matches all devices */ 79 { }, /* Terminating zero entry */ 80 }; 81 82 MODULE_DEVICE_TABLE(input, evbug_ids); 83 84 static struct input_handler evbug_handler = { 85 .event = evbug_event, 86 .connect = evbug_connect, 87 .disconnect = evbug_disconnect, 88 .name = "evbug", 89 .id_table = evbug_ids, 90 }; 91 92 static int __init evbug_init(void) 93 { 94 return input_register_handler(&evbug_handler); 95 } 96 97 static void __exit evbug_exit(void) 98 { 99 input_unregister_handler(&evbug_handler); 100 } 101 102 module_init(evbug_init); 103 module_exit(evbug_exit); 104