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
  26 #include <linux/module.h>
  27 #include <linux/gameport.h>
  28 #include <linux/kernel.h>
  29 #include <linux/delay.h>
  30 #include <linux/slab.h>
  31
  32 #define DRIVER_DESC     "Gameport data dumper module"
  33
  34 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  35 MODULE_DESCRIPTION(DRIVER_DESC);
  36 MODULE_LICENSE("GPL");
  37
  38 #define BUF_SIZE 256
  39
  40 struct joydump {
  41         unsigned int time;
  42         unsigned char data;
  43 };
  44
  45 static int joydump_connect(struct gameport *gameport, struct gameport_driver *drv)
  46 {
  47         struct joydump *buf;    /* all entries */
  48         struct joydump *dump, *prev;    /* one entry each */
  49         int axes[4], buttons;
  50         int i, j, t, timeout;
  51         unsigned long flags;
  52         unsigned char u;
  53
  54         printk(KERN_INFO "joydump: ,------------------ START ----------------.\n");
  55         printk(KERN_INFO "joydump: | Dumping: %30s |\n", gameport->phys);
  56         printk(KERN_INFO "joydump: | Speed: %28d kHz |\n", gameport->speed);
  57
  58         if (gameport_open(gameport, drv, GAMEPORT_MODE_RAW)) {
  59
  60                 printk(KERN_INFO "joydump: | Raw mode not available - trying cooked.    |\n");
  61
  62                 if (gameport_open(gameport, drv, GAMEPORT_MODE_COOKED)) {
  63
  64                         printk(KERN_INFO "joydump: | Cooked not available either. Failing.   |\n");
  65                         printk(KERN_INFO "joydump: `------------------- END -----------------'\n");
  66                         return -ENODEV;
  67                 }
  68
  69                 gameport_cooked_read(gameport, axes, &buttons);
  70
  71                 for (i = 0; i < 4; i++)
  72                         printk(KERN_INFO "joydump: | Axis %d: %4d.                           |\n", i, axes[i]);
  73                 printk(KERN_INFO "joydump: | Buttons %02x.                             |\n", buttons);
  74                 printk(KERN_INFO "joydump: `------------------- END -----------------'\n");
  75         }
  76
  77         timeout = gameport_time(gameport, 10000); /* 10 ms */
  78
  79         buf = kmalloc_array(BUF_SIZE, sizeof(struct joydump), GFP_KERNEL);
  80         if (!buf) {
  81                 printk(KERN_INFO "joydump: no memory for testing\n");
  82                 goto jd_end;
  83         }
  84         dump = buf;
  85         t = 0;
  86         i = 1;
  87
  88         local_irq_save(flags);
  89
  90         u = gameport_read(gameport);
  91
  92         dump->data = u;
  93         dump->time = t;
  94         dump++;
  95
  96         gameport_trigger(gameport);
  97
  98         while (i < BUF_SIZE && t < timeout) {
  99
 100                 dump->data = gameport_read(gameport);
 101
 102                 if (dump->data ^ u) {
 103                         u = dump->data;
 104                         dump->time = t;
 105                         i++;
 106                         dump++;
 107                 }
 108                 t++;
 109         }
 110
 111         local_irq_restore(flags);
 112
 113 /*
 114  * Dump data.
 115  */
 116
 117         t = i;
 118         dump = buf;
 119         prev = dump;
 120
 121         printk(KERN_INFO "joydump: >------------------ DATA -----------------<\n");
 122         printk(KERN_INFO "joydump: | index: %3d delta: %3d us data: ", 0, 0);
 123         for (j = 7; j >= 0; j--)
 124                 printk("%d", (dump->data >> j) & 1);
 125         printk(" |\n");
 126         dump++;
 127
 128         for (i = 1; i < t; i++, dump++, prev++) {
 129                 printk(KERN_INFO "joydump: | index: %3d delta: %3d us data: ",
 130                         i, dump->time - prev->time);
 131                 for (j = 7; j >= 0; j--)
 132                         printk("%d", (dump->data >> j) & 1);
 133                 printk(" |\n");
 134         }
 135         kfree(buf);
 136
 137 jd_end:
 138         printk(KERN_INFO "joydump: `------------------- END -----------------'\n");
 139
 140         return 0;
 141 }
 142
 143 static void joydump_disconnect(struct gameport *gameport)
 144 {
 145         gameport_close(gameport);
 146 }
 147
 148 static struct gameport_driver joydump_drv = {
 149         .driver         = {
 150                 .name   = "joydump",
 151         },
 152         .description    = DRIVER_DESC,
 153         .connect        = joydump_connect,
 154         .disconnect     = joydump_disconnect,
 155 };
 156
 157 module_gameport_driver(joydump_drv);