drivers/input/joystick/joydump.c

   1 /*
   2  *  Copyright (c) 1996-2001 Vojtech Pavlik
   3  */
   4
   5 /*
   6  * This is just a very simple driver that can dump the data
   7  * out of the joystick port into the syslog ...
   8  */
   9
  10 /*
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  24  *
  25  * Should you need to contact me, the author, you can do so either by
  26  * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
  27  * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
  28  */
  29
  30 #include <linux/module.h>
  31 #include <linux/gameport.h>
  32 #include <linux/kernel.h>
  33 #include <linux/delay.h>
  34 #include <linux/init.h>
  35 #include <linux/slab.h>
  36
  37 #define DRIVER_DESC     "Gameport data dumper module"
  38
  39 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  40 MODULE_DESCRIPTION(DRIVER_DESC);
  41 MODULE_LICENSE("GPL");
  42
  43 #define BUF_SIZE 256
  44
  45 struct joydump {
  46         unsigned int time;
  47         unsigned char data;
  48 };
  49
  50 static int joydump_connect(struct gameport *gameport, struct gameport_driver *drv)
  51 {
  52         struct joydump *buf;    /* all entries */
  53         struct joydump *dump, *prev;    /* one entry each */
  54         int axes[4], buttons;
  55         int i, j, t, timeout;
  56         unsigned long flags;
  57         unsigned char u;
  58
  59         printk(KERN_INFO "joydump: ,------------------ START ----------------.\n");
  60         printk(KERN_INFO "joydump: | Dumping: %30s |\n", gameport->phys);
  61         printk(KERN_INFO "joydump: | Speed: %28d kHz |\n", gameport->speed);
  62
  63         if (gameport_open(gameport, drv, GAMEPORT_MODE_RAW)) {
  64
  65                 printk(KERN_INFO "joydump: | Raw mode not available - trying cooked.    |\n");
  66
  67                 if (gameport_open(gameport, drv, GAMEPORT_MODE_COOKED)) {
  68
  69                         printk(KERN_INFO "joydump: | Cooked not available either. Failing.   |\n");
  70                         printk(KERN_INFO "joydump: `------------------- END -----------------'\n");
  71                         return -ENODEV;
  72                 }
  73
  74                 gameport_cooked_read(gameport, axes, &buttons);
  75
  76                 for (i = 0; i < 4; i++)
  77                         printk(KERN_INFO "joydump: | Axis %d: %4d.                           |\n", i, axes[i]);
  78                 printk(KERN_INFO "joydump: | Buttons %02x.                             |\n", buttons);
  79                 printk(KERN_INFO "joydump: `------------------- END -----------------'\n");
  80         }
  81
  82         timeout = gameport_time(gameport, 10000); /* 10 ms */
  83
  84         buf = kmalloc(BUF_SIZE * sizeof(struct joydump), GFP_KERNEL);
  85         if (!buf) {
  86                 printk(KERN_INFO "joydump: no memory for testing\n");
  87                 goto jd_end;
  88         }
  89         dump = buf;
  90         t = 0;
  91         i = 1;
  92
  93         local_irq_save(flags);
  94
  95         u = gameport_read(gameport);
  96
  97         dump->data = u;
  98         dump->time = t;
  99         dump++;
 100
 101         gameport_trigger(gameport);
 102
 103         while (i < BUF_SIZE && t < timeout) {
 104
 105                 dump->data = gameport_read(gameport);
 106
 107                 if (dump->data ^ u) {
 108                         u = dump->data;
 109                         dump->time = t;
 110                         i++;
 111                         dump++;
 112                 }
 113                 t++;
 114         }
 115
 116         local_irq_restore(flags);
 117
 118 /*
 119  * Dump data.
 120  */
 121
 122         t = i;
 123         dump = buf;
 124         prev = dump;
 125
 126         printk(KERN_INFO "joydump: >------------------ DATA -----------------<\n");
 127         printk(KERN_INFO "joydump: | index: %3d delta: %3d us data: ", 0, 0);
 128         for (j = 7; j >= 0; j--)
 129                 printk("%d", (dump->data >> j) & 1);
 130         printk(" |\n");
 131         dump++;
 132
 133         for (i = 1; i < t; i++, dump++, prev++) {
 134                 printk(KERN_INFO "joydump: | index: %3d delta: %3d us data: ",
 135                         i, dump->time - prev->time);
 136                 for (j = 7; j >= 0; j--)
 137                         printk("%d", (dump->data >> j) & 1);
 138                 printk(" |\n");
 139         }
 140         kfree(buf);
 141
 142 jd_end:
 143         printk(KERN_INFO "joydump: `------------------- END -----------------'\n");
 144
 145         return 0;
 146 }
 147
 148 static void joydump_disconnect(struct gameport *gameport)
 149 {
 150         gameport_close(gameport);
 151 }
 152
 153 static struct gameport_driver joydump_drv = {
 154         .driver         = {
 155                 .name   = "joydump",
 156         },
 157         .description    = DRIVER_DESC,
 158         .connect        = joydump_connect,
 159         .disconnect     = joydump_disconnect,
 160 };
 161
 162 static int __init joydump_init(void)
 163 {
 164         gameport_register_driver(&joydump_drv);
 165         return 0;
 166 }
 167
 168 static void __exit joydump_exit(void)
 169 {
 170         gameport_unregister_driver(&joydump_drv);
 171 }
 172
 173 module_init(joydump_init);
 174 module_exit(joydump_exit);