drivers/input/evbug.c

   1 /*
   2  *  Copyright (c) 1999-2001 Vojtech Pavlik
   3  */
   4
   5 /*
   6  *  Input driver event debug module - dumps all events into syslog
   7  */
   8
   9 /*
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  23  *
  24  * Should you need to contact me, the author, you can do so either by
  25  * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
  26  * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
  27  */
  28
  29 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  30
  31 #include <linux/slab.h>
  32 #include <linux/module.h>
  33 #include <linux/input.h>
  34 #include <linux/init.h>
  35 #include <linux/device.h>
  36
  37 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  38 MODULE_DESCRIPTION("Input driver event debug module");
  39 MODULE_LICENSE("GPL");
  40
  41 static void evbug_event(struct input_handle *handle, unsigned int type, unsigned int code, int value)
  42 {
  43         printk(KERN_DEBUG pr_fmt("Event. Dev: %s, Type: %d, Code: %d, Value: %d\n"),
  44                dev_name(&handle->dev->dev), type, code, value);
  45 }
  46
  47 static int evbug_connect(struct input_handler *handler, struct input_dev *dev,
  48                          const struct input_device_id *id)
  49 {
  50         struct input_handle *handle;
  51         int error;
  52
  53         handle = kzalloc(sizeof(struct input_handle), GFP_KERNEL);
  54         if (!handle)
  55                 return -ENOMEM;
  56
  57         handle->dev = dev;
  58         handle->handler = handler;
  59         handle->name = "evbug";
  60
  61         error = input_register_handle(handle);
  62         if (error)
  63                 goto err_free_handle;
  64
  65         error = input_open_device(handle);
  66         if (error)
  67                 goto err_unregister_handle;
  68
  69         printk(KERN_DEBUG pr_fmt("Connected device: %s (%s at %s)\n"),
  70                dev_name(&dev->dev),
  71                dev->name ?: "unknown",
  72                dev->phys ?: "unknown");
  73
  74         return 0;
  75
  76  err_unregister_handle:
  77         input_unregister_handle(handle);
  78  err_free_handle:
  79         kfree(handle);
  80         return error;
  81 }
  82
  83 static void evbug_disconnect(struct input_handle *handle)
  84 {
  85         printk(KERN_DEBUG pr_fmt("Disconnected device: %s\n"),
  86                dev_name(&handle->dev->dev));
  87
  88         input_close_device(handle);
  89         input_unregister_handle(handle);
  90         kfree(handle);
  91 }
  92
  93 static const struct input_device_id evbug_ids[] = {
  94         { .driver_info = 1 },   /* Matches all devices */
  95         { },                    /* Terminating zero entry */
  96 };
  97
  98 MODULE_DEVICE_TABLE(input, evbug_ids);
  99
 100 static struct input_handler evbug_handler = {
 101         .event =        evbug_event,
 102         .connect =      evbug_connect,
 103         .disconnect =   evbug_disconnect,
 104         .name =         "evbug",
 105         .id_table =     evbug_ids,
 106 };
 107
 108 static int __init evbug_init(void)
 109 {
 110         return input_register_handler(&evbug_handler);
 111 }
 112
 113 static void __exit evbug_exit(void)
 114 {
 115         input_unregister_handler(&evbug_handler);
 116 }
 117
 118 module_init(evbug_init);
 119 module_exit(evbug_exit);