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
  25 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  26
  27 #include <linux/slab.h>
  28 #include <linux/module.h>
  29 #include <linux/input.h>
  30 #include <linux/init.h>
  31 #include <linux/device.h>
  32
  33 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  34 MODULE_DESCRIPTION("Input driver event debug module");
  35 MODULE_LICENSE("GPL");
  36
  37 static void evbug_event(struct input_handle *handle, unsigned int type, unsigned int code, int value)
  38 {
  39         printk(KERN_DEBUG pr_fmt("Event. Dev: %s, Type: %d, Code: %d, Value: %d\n"),
  40                dev_name(&handle->dev->dev), type, code, value);
  41 }
  42
  43 static int evbug_connect(struct input_handler *handler, struct input_dev *dev,
  44                          const struct input_device_id *id)
  45 {
  46         struct input_handle *handle;
  47         int error;
  48
  49         handle = kzalloc(sizeof(struct input_handle), GFP_KERNEL);
  50         if (!handle)
  51                 return -ENOMEM;
  52
  53         handle->dev = dev;
  54         handle->handler = handler;
  55         handle->name = "evbug";
  56
  57         error = input_register_handle(handle);
  58         if (error)
  59                 goto err_free_handle;
  60
  61         error = input_open_device(handle);
  62         if (error)
  63                 goto err_unregister_handle;
  64
  65         printk(KERN_DEBUG pr_fmt("Connected device: %s (%s at %s)\n"),
  66                dev_name(&dev->dev),
  67                dev->name ?: "unknown",
  68                dev->phys ?: "unknown");
  69
  70         return 0;
  71
  72  err_unregister_handle:
  73         input_unregister_handle(handle);
  74  err_free_handle:
  75         kfree(handle);
  76         return error;
  77 }
  78
  79 static void evbug_disconnect(struct input_handle *handle)
  80 {
  81         printk(KERN_DEBUG pr_fmt("Disconnected device: %s\n"),
  82                dev_name(&handle->dev->dev));
  83
  84         input_close_device(handle);
  85         input_unregister_handle(handle);
  86         kfree(handle);
  87 }
  88
  89 static const struct input_device_id evbug_ids[] = {
  90         { .driver_info = 1 },   /* Matches all devices */
  91         { },                    /* Terminating zero entry */
  92 };
  93
  94 MODULE_DEVICE_TABLE(input, evbug_ids);
  95
  96 static struct input_handler evbug_handler = {
  97         .event =        evbug_event,
  98         .connect =      evbug_connect,
  99         .disconnect =   evbug_disconnect,
 100         .name =         "evbug",
 101         .id_table =     evbug_ids,
 102 };
 103
 104 static int __init evbug_init(void)
 105 {
 106         return input_register_handler(&evbug_handler);
 107 }
 108
 109 static void __exit evbug_exit(void)
 110 {
 111         input_unregister_handler(&evbug_handler);
 112 }
 113
 114 module_init(evbug_init);
 115 module_exit(evbug_exit);